diff --git a/tests/TestCommD3Q19.cpp b/tests/TestCommD3Q19.cpp
index 3db9c9e2..94bf1703 100644
--- a/tests/TestCommD3Q19.cpp
+++ b/tests/TestCommD3Q19.cpp
@@ -324,510 +324,11 @@ int main(int argc, char **argv)
 	if (rank == 0) cout << "Domain set." << endl;
 	//...........................................................................
 
-	// Set up MPI communication structurese
-	if (rank==0)	printf ("Setting up communication control structures \n");
-	//......................................................................................
-	// Get the actual D3Q19 communication counts (based on location of solid phase)
-	// Discrete velocity set symmetry implies the sendcount = recvcount
-	int sendCount_x, sendCount_y, sendCount_z, sendCount_X, sendCount_Y, sendCount_Z;
-	int sendCount_xy, sendCount_yz, sendCount_xz, sendCount_Xy, sendCount_Yz, sendCount_xZ;
-	int sendCount_xY, sendCount_yZ, sendCount_Xz, sendCount_XY, sendCount_YZ, sendCount_XZ;
-	sendCount_x = sendCount_y = sendCount_z = sendCount_X = sendCount_Y = sendCount_Z = 0;
-	sendCount_xy = sendCount_yz = sendCount_xz = sendCount_Xy = sendCount_Yz = sendCount_xZ = 0;
-	sendCount_xY = sendCount_yZ = sendCount_Xz = sendCount_XY = sendCount_YZ = sendCount_XZ = 0;
-	//......................................................................................
-	for (k=1; k<Nz-1; k++){
-		for (j=1; j<Ny-1; j++){
-			for (i=1; i<Nx-1; i++){
-				// Check the phase ID
-				if (id[k*Nx*Ny+j*Nx+i] != 0){
-					// Counts for the six faces
-					if (i==1)	sendCount_x++;
-					if (j==1)	sendCount_y++;
-					if (k==1)	sendCount_z++;
-					if (i==Nx-2)	sendCount_X++;
-					if (j==Ny-2)	sendCount_Y++;
-					if (k==Nz-2)	sendCount_Z++;
-					// Counts for the twelve edges
-					if (i==1 && j==1)	sendCount_xy++;
-					if (i==1 && j==Ny-2)	sendCount_xY++;
-					if (i==Nx-2 && j==1)	sendCount_Xy++;
-					if (i==Nx-2 && j==Ny-2)	sendCount_XY++;
-
-					if (i==1 && k==1)	sendCount_xz++;
-					if (i==1 && k==Nz-2)	sendCount_xZ++;
-					if (i==Nx-2 && k==1)	sendCount_Xz++;
-					if (i==Nx-2 && k==Nz-2)	sendCount_XZ++;
-
-					if (j==1 && k==1)	sendCount_yz++;
-					if (j==1 && k==Nz-2)	sendCount_yZ++;
-					if (j==Ny-2 && k==1)	sendCount_Yz++;
-					if (j==Ny-2 && k==Nz-2)	sendCount_YZ++;
-				}
-			}
-		}
-	}
-	//......................................................................................
-	int *sendList_x, *sendList_y, *sendList_z, *sendList_X, *sendList_Y, *sendList_Z;
-	int *sendList_xy, *sendList_yz, *sendList_xz, *sendList_Xy, *sendList_Yz, *sendList_xZ;
-	int *sendList_xY, *sendList_yZ, *sendList_Xz, *sendList_XY, *sendList_YZ, *sendList_XZ;
-	//......................................................................................
-	// send buffers
-	sendList_x = new int [sendCount_x];
-	sendList_y = new int [sendCount_y];
-	sendList_z = new int [sendCount_z];
-	sendList_X = new int [sendCount_X];
-	sendList_Y = new int [sendCount_Y];
-	sendList_Z = new int [sendCount_Z];
-	sendList_xy = new int [sendCount_xy];
-	sendList_yz = new int [sendCount_yz];
-	sendList_xz = new int [sendCount_xz];
-	sendList_Xy = new int [sendCount_Xy];
-	sendList_Yz = new int [sendCount_Yz];
-	sendList_xZ = new int [sendCount_xZ];
-	sendList_xY = new int [sendCount_xY];
-	sendList_yZ = new int [sendCount_yZ];
-	sendList_Xz = new int [sendCount_Xz];
-	sendList_XY = new int [sendCount_XY];
-	sendList_YZ = new int [sendCount_YZ];
-	sendList_XZ = new int [sendCount_XZ];
-	if (rank==0)	printf ("Preparing the sendlists \n");
-	//......................................................................................
-	// Populate the send list
-	sendCount_x = sendCount_y = sendCount_z = sendCount_X = sendCount_Y = sendCount_Z = 0;
-	sendCount_xy = sendCount_yz = sendCount_xz = sendCount_Xy = sendCount_Yz = sendCount_xZ = 0;
-	sendCount_xY = sendCount_yZ = sendCount_Xz = sendCount_XY = sendCount_YZ = sendCount_XZ = 0;
-	for (k=1; k<Nz-1; k++){
-		for (j=1; j<Ny-1; j++){
-			for (i=1; i<Nx-1; i++){
-				// Local value to send
-				n = k*Nx*Ny+j*Nx+i;
-				if (id[n] != 0){
-					// Counts for the six faces
-					if (i==1)		sendList_x[sendCount_x++]=n;
-					if (j==1)		sendList_y[sendCount_y++]=n;
-					if (k==1)		sendList_z[sendCount_z++]=n;
-					if (i==Nx-2)	sendList_X[sendCount_X++]=n;
-					if (j==Ny-2)	sendList_Y[sendCount_Y++]=n;
-					if (k==Nz-2)	sendList_Z[sendCount_Z++]=n;
-					// Counts for the twelve edges
-					if (i==1 && j==1)		sendList_xy[sendCount_xy++]=n;
-					if (i==1 && j==Ny-2)	sendList_xY[sendCount_xY++]=n;
-					if (i==Nx-2 && j==1)	sendList_Xy[sendCount_Xy++]=n;
-					if (i==Nx-2 && j==Ny-2)	sendList_XY[sendCount_XY++]=n;
-
-					if (i==1 && k==1)		sendList_xz[sendCount_xz++]=n;
-					if (i==1 && k==Nz-2)	sendList_xZ[sendCount_xZ++]=n;
-					if (i==Nx-2 && k==1)	sendList_Xz[sendCount_Xz++]=n;
-					if (i==Nx-2 && k==Nz-2)	sendList_XZ[sendCount_XZ++]=n;
-
-					if (j==1 && k==1)		sendList_yz[sendCount_yz++]=n;
-					if (j==1 && k==Nz-2)	sendList_yZ[sendCount_yZ++]=n;
-					if (j==Ny-2 && k==1)	sendList_Yz[sendCount_Yz++]=n;
-					if (j==Ny-2 && k==Nz-2)	sendList_YZ[sendCount_YZ++]=n;
-				}
-			}
-		}
-	}
-	MPI_Barrier(MPI_COMM_WORLD);
-	if (rank==0)	printf ("SendLists are ready on host\n");
-	//......................................................................................
-	// Use MPI to fill in the recvCounts form the associated processes
-	int recvCount_x, recvCount_y, recvCount_z, recvCount_X, recvCount_Y, recvCount_Z;
-	int recvCount_xy, recvCount_yz, recvCount_xz, recvCount_Xy, recvCount_Yz, recvCount_xZ;
-	int recvCount_xY, recvCount_yZ, recvCount_Xz, recvCount_XY, recvCount_YZ, recvCount_XZ;
-	//......................................................................................
-	//**********************************************************************************
-	// Fill in the recieve counts using MPI
-	sendtag = recvtag = 3;
-	CommunicateSendRecvCounts( MPI_COMM_WORLD, sendtag, recvtag, 
-			rank_x, rank_y, rank_z, rank_X, rank_Y, rank_Z,
-			rank_xy, rank_XY, rank_xY, rank_Xy,
-			rank_xz, rank_XZ, rank_xZ, rank_Xz,
-			rank_yz, rank_YZ, rank_yZ, rank_Yz,
-			sendCount_x, sendCount_y, sendCount_z, sendCount_X, sendCount_Y, sendCount_Z,
-			sendCount_xy, sendCount_XY, sendCount_xY, sendCount_Xy,
-			sendCount_xz, sendCount_XZ, sendCount_xZ, sendCount_Xz,
-			sendCount_yz, sendCount_YZ, sendCount_yZ, sendCount_Yz,
-			recvCount_x, recvCount_y, recvCount_z, recvCount_X, recvCount_Y, recvCount_Z,
-			recvCount_xy, recvCount_XY, recvCount_xY, recvCount_Xy,
-			recvCount_xz, recvCount_XZ, recvCount_xZ, recvCount_Xz,
-			recvCount_yz, recvCount_YZ, recvCount_yZ, recvCount_Yz );
-	//**********************************************************************************
-	//......................................................................................
-	int *recvList_x, *recvList_y, *recvList_z, *recvList_X, *recvList_Y, *recvList_Z;
-	int *recvList_xy, *recvList_yz, *recvList_xz, *recvList_Xy, *recvList_Yz, *recvList_xZ;
-	int *recvList_xY, *recvList_yZ, *recvList_Xz, *recvList_XY, *recvList_YZ, *recvList_XZ;
-	//......................................................................................
-	// recv buffers
-	recvList_x = new int [recvCount_x];
-	recvList_y = new int [recvCount_y];
-	recvList_z = new int [recvCount_z];
-	recvList_X = new int [recvCount_X];
-	recvList_Y = new int [recvCount_Y];
-	recvList_Z = new int [recvCount_Z];
-	recvList_xy = new int [recvCount_xy];
-	recvList_yz = new int [recvCount_yz];
-	recvList_xz = new int [recvCount_xz];
-	recvList_Xy = new int [recvCount_Xy];
-	recvList_Yz = new int [recvCount_Yz];
-	recvList_xZ = new int [recvCount_xZ];
-	recvList_xY = new int [recvCount_xY];
-	recvList_yZ = new int [recvCount_yZ];
-	recvList_Xz = new int [recvCount_Xz];
-	recvList_XY = new int [recvCount_XY];
-	recvList_YZ = new int [recvCount_YZ];
-	recvList_XZ = new int [recvCount_XZ];
-	//......................................................................................
-	//......................................................................................
-	// Use MPI to fill in the appropriate values for recvList
-	// Fill in the recieve lists using MPI
-	sendtag = recvtag = 4;
-	CommunicateRecvLists( MPI_COMM_WORLD, sendtag, recvtag, 
-			sendList_x, sendList_y, sendList_z, sendList_X, sendList_Y, sendList_Z,
-			sendList_xy, sendList_XY, sendList_xY, sendList_Xy,
-			sendList_xz, sendList_XZ, sendList_xZ, sendList_Xz,
-			sendList_yz, sendList_YZ, sendList_yZ, sendList_Yz,
-			sendCount_x, sendCount_y, sendCount_z, sendCount_X, sendCount_Y, sendCount_Z,
-			sendCount_xy, sendCount_XY, sendCount_xY, sendCount_Xy,
-			sendCount_xz, sendCount_XZ, sendCount_xZ, sendCount_Xz,
-			sendCount_yz, sendCount_YZ, sendCount_yZ, sendCount_Yz,
-			recvList_x, recvList_y, recvList_z, recvList_X, recvList_Y, recvList_Z,
-			recvList_xy, recvList_XY, recvList_xY, recvList_Xy,
-			recvList_xz, recvList_XZ, recvList_xZ, recvList_Xz,
-			recvList_yz, recvList_YZ, recvList_yZ, recvList_Yz,
-			recvCount_x, recvCount_y, recvCount_z, recvCount_X, recvCount_Y, recvCount_Z,
-			recvCount_xy, recvCount_XY, recvCount_xY, recvCount_Xy,
-			recvCount_xz, recvCount_XZ, recvCount_xZ, recvCount_Xz,
-			recvCount_yz, recvCount_YZ, recvCount_yZ, recvCount_Yz,
-			rank_x, rank_y, rank_z, rank_X, rank_Y, rank_Z, rank_xy, rank_XY, rank_xY,
-			rank_Xy, rank_xz, rank_XZ, rank_xZ, rank_Xz, rank_yz, rank_YZ, rank_yZ, rank_Yz );
-	//......................................................................................
-	for (int idx=0; idx<recvCount_x; idx++)	recvList_x[idx] -= (Nx-2);
-	for (int idx=0; idx<recvCount_X; idx++)	recvList_X[idx] += (Nx-2);
-	for (int idx=0; idx<recvCount_y; idx++)	recvList_y[idx] -= (Ny-2)*Nx;
-	for (int idx=0; idx<recvCount_Y; idx++)	recvList_Y[idx] += (Ny-2)*Nx;
-	for (int idx=0; idx<recvCount_z; idx++)	recvList_z[idx] -= (Nz-2)*Nx*Ny;
-	for (int idx=0; idx<recvCount_Z; idx++)	recvList_Z[idx] += (Nz-2)*Nx*Ny;
+	//...........................................................................
+	if (rank==0)	printf ("Create ScaLBL_Communicator \n");
+	// Create a communicator for the device
+	ScaLBL_Communicator ScaLBL_Comm(Dm);
 	
-	for (int idx=0; idx<recvCount_xy; idx++)	recvList_xy[idx] -= (Nx-2)+(Ny-2)*Nx;
-	for (int idx=0; idx<recvCount_XY; idx++)	recvList_XY[idx] += (Nx-2)+(Ny-2)*Nx;
-	for (int idx=0; idx<recvCount_xY; idx++)	recvList_xY[idx] -= (Nx-2)-(Ny-2)*Nx;
-	for (int idx=0; idx<recvCount_Xy; idx++)	recvList_Xy[idx] += (Nx-2)-(Ny-2)*Nx;
-	
-	for (int idx=0; idx<recvCount_xz; idx++)	recvList_xz[idx] -= (Nx-2)+(Nz-2)*Nx*Ny;
-	for (int idx=0; idx<recvCount_XZ; idx++)	recvList_XZ[idx] += (Nx-2)+(Nz-2)*Nx*Ny;
-	for (int idx=0; idx<recvCount_xZ; idx++)	recvList_xZ[idx] -= (Nx-2)-(Nz-2)*Nx*Ny;
-	for (int idx=0; idx<recvCount_Xz; idx++)	recvList_Xz[idx] += (Nx-2)-(Nz-2)*Nx*Ny;
-	
-	for (int idx=0; idx<recvCount_yz; idx++)	recvList_yz[idx] -= (Ny-2)*Nx + (Nz-2)*Nx*Ny;
-	for (int idx=0; idx<recvCount_YZ; idx++)	recvList_YZ[idx] += (Ny-2)*Nx + (Nz-2)*Nx*Ny;
-	for (int idx=0; idx<recvCount_yZ; idx++)	recvList_yZ[idx] -= (Ny-2)*Nx - (Nz-2)*Nx*Ny;
-	for (int idx=0; idx<recvCount_Yz; idx++)	recvList_Yz[idx] += (Ny-2)*Nx - (Nz-2)*Nx*Ny;
-	//......................................................................................
-	double *sendbuf_x, *sendbuf_y, *sendbuf_z, *sendbuf_X, *sendbuf_Y, *sendbuf_Z;
-	double *sendbuf_xy, *sendbuf_yz, *sendbuf_xz, *sendbuf_Xy, *sendbuf_Yz, *sendbuf_xZ;
-	double *sendbuf_xY, *sendbuf_yZ, *sendbuf_Xz, *sendbuf_XY, *sendbuf_YZ, *sendbuf_XZ;
-	double *recvbuf_x, *recvbuf_y, *recvbuf_z, *recvbuf_X, *recvbuf_Y, *recvbuf_Z;
-	double *recvbuf_xy, *recvbuf_yz, *recvbuf_xz, *recvbuf_Xy, *recvbuf_Yz, *recvbuf_xZ;
-	double *recvbuf_xY, *recvbuf_yZ, *recvbuf_Xz, *recvbuf_XY, *recvbuf_YZ, *recvbuf_XZ;
-	//......................................................................................
-	AllocateDeviceMemory((void **) &sendbuf_x, 5*sendCount_x*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_X, 5*sendCount_X*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_y, 5*sendCount_y*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_Y, 5*sendCount_Y*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_z, 5*sendCount_z*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_Z, 5*sendCount_Z*sizeof(double));	// Allocatevoid * memory
-	AllocateDeviceMemory((void **) &sendbuf_xy, sendCount_xy*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_xY, sendCount_xY*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_Xy, sendCount_Xy*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_XY, sendCount_XY*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_xz, sendCount_xz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_xZ, sendCount_xZ*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_Xz, sendCount_Xz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_XZ, sendCount_XZ*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_yz, sendCount_yz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_yZ, sendCount_yZ*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_Yz, sendCount_Yz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &sendbuf_YZ, sendCount_YZ*sizeof(double));	// Allocate device memory
-	//......................................................................................
-	AllocateDeviceMemory((void **) &recvbuf_x, 5*recvCount_x*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_X, 5*recvCount_X*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_y, 5*recvCount_y*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_Y, 5*recvCount_Y*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_z, 5*recvCount_z*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_Z, 5*recvCount_Z*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_xy, recvCount_xy*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_xY, recvCount_xY*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_Xy, recvCount_Xy*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_XY, recvCount_XY*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_xz, recvCount_xz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_xZ, recvCount_xZ*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_Xz, recvCount_Xz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_XZ, recvCount_XZ*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_yz, recvCount_yz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_yZ, recvCount_yZ*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_Yz, recvCount_Yz*sizeof(double));	// Allocate device memory
-	AllocateDeviceMemory((void **) &recvbuf_YZ, recvCount_YZ*sizeof(double));	// Allocate device memory
-	//......................................................................................
-	int *dvcSendList_x, *dvcSendList_y, *dvcSendList_z, *dvcSendList_X, *dvcSendList_Y, *dvcSendList_Z;
-	int *dvcSendList_xy, *dvcSendList_yz, *dvcSendList_xz, *dvcSendList_Xy, *dvcSendList_Yz, *dvcSendList_xZ;
-	int *dvcSendList_xY, *dvcSendList_yZ, *dvcSendList_Xz, *dvcSendList_XY, *dvcSendList_YZ, *dvcSendList_XZ;
-	//......................................................................................
-	int *dvcRecvList_x, *dvcRecvList_y, *dvcRecvList_z, *dvcRecvList_X, *dvcRecvList_Y, *dvcRecvList_Z;
-	int *dvcRecvList_xy, *dvcRecvList_yz, *dvcRecvList_xz, *dvcRecvList_Xy, *dvcRecvList_Yz, *dvcRecvList_xZ;
-	int *dvcRecvList_xY, *dvcRecvList_yZ, *dvcRecvList_Xz, *dvcRecvList_XY, *dvcRecvList_YZ, *dvcRecvList_XZ;
-	//......................................................................................
-	AllocateDeviceMemory((void **) &dvcSendList_x, sendCount_x*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_X, sendCount_X*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_y, sendCount_y*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_Y, sendCount_Y*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_z, sendCount_z*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_Z, sendCount_Z*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_xy, sendCount_xy*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_xY, sendCount_xY*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_Xy, sendCount_Xy*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_XY, sendCount_XY*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_xz, sendCount_xz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_xZ, sendCount_xZ*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_Xz, sendCount_Xz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_XZ, sendCount_XZ*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_yz, sendCount_yz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_yZ, sendCount_yZ*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_Yz, sendCount_Yz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcSendList_YZ, sendCount_YZ*sizeof(int));	// Allocate device memory
-	//......................................................................................
-	AllocateDeviceMemory((void **) &dvcRecvList_x, recvCount_x*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_X, recvCount_X*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_y, recvCount_y*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_Y, recvCount_Y*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_z, recvCount_z*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_Z, recvCount_Z*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_xy, recvCount_xy*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_xY, recvCount_xY*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_Xy, recvCount_Xy*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_XY, recvCount_XY*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_xz, recvCount_xz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_xZ, recvCount_xZ*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_Xz, recvCount_Xz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_XZ, recvCount_XZ*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_yz, recvCount_yz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_yZ, recvCount_yZ*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_Yz, recvCount_Yz*sizeof(int));	// Allocate device memory
-	AllocateDeviceMemory((void **) &dvcRecvList_YZ, recvCount_YZ*sizeof(int));	// Allocate device memory
-	//......................................................................................
-	MPI_Barrier(MPI_COMM_WORLD);
-	if (rank==0)	printf ("Prepare to copy send/recv Lists to device \n");
-	CopyToDevice(dvcSendList_x,sendList_x,sendCount_x*sizeof(int));
-	CopyToDevice(dvcSendList_X,sendList_X,sendCount_X*sizeof(int));
-	CopyToDevice(dvcSendList_y,sendList_y,sendCount_y*sizeof(int));
-	CopyToDevice(dvcSendList_Y,sendList_Y,sendCount_Y*sizeof(int));
-	CopyToDevice(dvcSendList_z,sendList_z,sendCount_z*sizeof(int));
-	CopyToDevice(dvcSendList_Z,sendList_Z,sendCount_Z*sizeof(int));
-	CopyToDevice(dvcSendList_xy,sendList_xy,sendCount_xy*sizeof(int));
-	CopyToDevice(dvcSendList_XY,sendList_XY,sendCount_XY*sizeof(int));
-	CopyToDevice(dvcSendList_xY,sendList_xY,sendCount_xY*sizeof(int));
-	CopyToDevice(dvcSendList_Xy,sendList_Xy,sendCount_Xy*sizeof(int));
-	CopyToDevice(dvcSendList_xz,sendList_xz,sendCount_xz*sizeof(int));
-	CopyToDevice(dvcSendList_XZ,sendList_XZ,sendCount_XZ*sizeof(int));
-	CopyToDevice(dvcSendList_xZ,sendList_xZ,sendCount_xZ*sizeof(int));
-	CopyToDevice(dvcSendList_Xz,sendList_Xz,sendCount_Xz*sizeof(int));
-	CopyToDevice(dvcSendList_yz,sendList_yz,sendCount_yz*sizeof(int));
-	CopyToDevice(dvcSendList_YZ,sendList_YZ,sendCount_YZ*sizeof(int));
-	CopyToDevice(dvcSendList_yZ,sendList_yZ,sendCount_yZ*sizeof(int));
-	CopyToDevice(dvcSendList_Yz,sendList_Yz,sendCount_Yz*sizeof(int));
-	//......................................................................................
-	CopyToDevice(dvcRecvList_x,recvList_x,recvCount_x*sizeof(int));
-	CopyToDevice(dvcRecvList_X,recvList_X,recvCount_X*sizeof(int));
-	CopyToDevice(dvcRecvList_y,recvList_y,recvCount_y*sizeof(int));
-	CopyToDevice(dvcRecvList_Y,recvList_Y,recvCount_Y*sizeof(int));
-	CopyToDevice(dvcRecvList_z,recvList_z,recvCount_z*sizeof(int));
-	CopyToDevice(dvcRecvList_Z,recvList_Z,recvCount_Z*sizeof(int));
-	CopyToDevice(dvcRecvList_xy,recvList_xy,recvCount_xy*sizeof(int));
-	CopyToDevice(dvcRecvList_XY,recvList_XY,recvCount_XY*sizeof(int));
-	CopyToDevice(dvcRecvList_xY,recvList_xY,recvCount_xY*sizeof(int));
-	CopyToDevice(dvcRecvList_Xy,recvList_Xy,recvCount_Xy*sizeof(int));
-	CopyToDevice(dvcRecvList_xz,recvList_xz,recvCount_xz*sizeof(int));
-	CopyToDevice(dvcRecvList_XZ,recvList_XZ,recvCount_XZ*sizeof(int));
-	CopyToDevice(dvcRecvList_xZ,recvList_xZ,recvCount_xZ*sizeof(int));
-	CopyToDevice(dvcRecvList_Xz,recvList_Xz,recvCount_Xz*sizeof(int));
-	CopyToDevice(dvcRecvList_yz,recvList_yz,recvCount_yz*sizeof(int));
-	CopyToDevice(dvcRecvList_YZ,recvList_YZ,recvCount_YZ*sizeof(int));
-	CopyToDevice(dvcRecvList_yZ,recvList_yZ,recvCount_yZ*sizeof(int));
-	CopyToDevice(dvcRecvList_Yz,recvList_Yz,recvCount_Yz*sizeof(int));
-	//......................................................................................
-	// Fill in the phase ID from neighboring processors
-	char *sendID_x, *sendID_y, *sendID_z, *sendID_X, *sendID_Y, *sendID_Z;
-	char *sendID_xy, *sendID_yz, *sendID_xz, *sendID_Xy, *sendID_Yz, *sendID_xZ;
-	char *sendID_xY, *sendID_yZ, *sendID_Xz, *sendID_XY, *sendID_YZ, *sendID_XZ;
-	char *recvID_x, *recvID_y, *recvID_z, *recvID_X, *recvID_Y, *recvID_Z;
-	char *recvID_xy, *recvID_yz, *recvID_xz, *recvID_Xy, *recvID_Yz, *recvID_xZ;
-	char *recvID_xY, *recvID_yZ, *recvID_Xz, *recvID_XY, *recvID_YZ, *recvID_XZ;
-	// send buffers
-	sendID_x = new char [sendCount_x];
-	sendID_y = new char [sendCount_y];
-	sendID_z = new char [sendCount_z];
-	sendID_X = new char [sendCount_X];
-	sendID_Y = new char [sendCount_Y];
-	sendID_Z = new char [sendCount_Z];
-	sendID_xy = new char [sendCount_xy];
-	sendID_yz = new char [sendCount_yz];
-	sendID_xz = new char [sendCount_xz];
-	sendID_Xy = new char [sendCount_Xy];
-	sendID_Yz = new char [sendCount_Yz];
-	sendID_xZ = new char [sendCount_xZ];
-	sendID_xY = new char [sendCount_xY];
-	sendID_yZ = new char [sendCount_yZ];
-	sendID_Xz = new char [sendCount_Xz];
-	sendID_XY = new char [sendCount_XY];
-	sendID_YZ = new char [sendCount_YZ];
-	sendID_XZ = new char [sendCount_XZ];
-	//......................................................................................
-	// recv buffers
-	recvID_x = new char [recvCount_x];
-	recvID_y = new char [recvCount_y];
-	recvID_z = new char [recvCount_z];
-	recvID_X = new char [recvCount_X];
-	recvID_Y = new char [recvCount_Y];
-	recvID_Z = new char [recvCount_Z];
-	recvID_xy = new char [recvCount_xy];
-	recvID_yz = new char [recvCount_yz];
-	recvID_xz = new char [recvCount_xz];
-	recvID_Xy = new char [recvCount_Xy];
-	recvID_xZ = new char [recvCount_xZ];
-	recvID_xY = new char [recvCount_xY];
-	recvID_yZ = new char [recvCount_yZ];
-	recvID_Yz = new char [recvCount_Yz];
-	recvID_Xz = new char [recvCount_Xz];
-	recvID_XY = new char [recvCount_XY];
-	recvID_YZ = new char [recvCount_YZ];
-	recvID_XZ = new char [recvCount_XZ];
-	//......................................................................................
-	sendtag = recvtag = 7;
-	PackID(sendList_x, sendCount_x ,sendID_x, id);
-	PackID(sendList_X, sendCount_X ,sendID_X, id);
-	PackID(sendList_y, sendCount_y ,sendID_y, id);
-	PackID(sendList_Y, sendCount_Y ,sendID_Y, id);
-	PackID(sendList_z, sendCount_z ,sendID_z, id);
-	PackID(sendList_Z, sendCount_Z ,sendID_Z, id);
-	PackID(sendList_xy, sendCount_xy ,sendID_xy, id);
-	PackID(sendList_Xy, sendCount_Xy ,sendID_Xy, id);
-	PackID(sendList_xY, sendCount_xY ,sendID_xY, id);
-	PackID(sendList_XY, sendCount_XY ,sendID_XY, id);
-	PackID(sendList_xz, sendCount_xz ,sendID_xz, id);
-	PackID(sendList_Xz, sendCount_Xz ,sendID_Xz, id);
-	PackID(sendList_xZ, sendCount_xZ ,sendID_xZ, id);
-	PackID(sendList_XZ, sendCount_XZ ,sendID_XZ, id);
-	PackID(sendList_yz, sendCount_yz ,sendID_yz, id);
-	PackID(sendList_Yz, sendCount_Yz ,sendID_Yz, id);
-	PackID(sendList_yZ, sendCount_yZ ,sendID_yZ, id);
-	PackID(sendList_YZ, sendCount_YZ ,sendID_YZ, id);
-	//......................................................................................
-	MPI_Sendrecv(sendID_x,sendCount_x,MPI_CHAR,rank_x,sendtag,
-			recvID_X,recvCount_X,MPI_CHAR,rank_X,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_X,sendCount_X,MPI_CHAR,rank_X,sendtag,
-			recvID_x,recvCount_x,MPI_CHAR,rank_x,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_y,sendCount_y,MPI_CHAR,rank_y,sendtag,
-			recvID_Y,recvCount_Y,MPI_CHAR,rank_Y,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_Y,sendCount_Y,MPI_CHAR,rank_Y,sendtag,
-			recvID_y,recvCount_y,MPI_CHAR,rank_y,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_z,sendCount_z,MPI_CHAR,rank_z,sendtag,
-			recvID_Z,recvCount_Z,MPI_CHAR,rank_Z,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_Z,sendCount_Z,MPI_CHAR,rank_Z,sendtag,
-			recvID_z,recvCount_z,MPI_CHAR,rank_z,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_xy,sendCount_xy,MPI_CHAR,rank_xy,sendtag,
-			recvID_XY,recvCount_XY,MPI_CHAR,rank_XY,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_XY,sendCount_XY,MPI_CHAR,rank_XY,sendtag,
-			recvID_xy,recvCount_xy,MPI_CHAR,rank_xy,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_Xy,sendCount_Xy,MPI_CHAR,rank_Xy,sendtag,
-			recvID_xY,recvCount_xY,MPI_CHAR,rank_xY,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_xY,sendCount_xY,MPI_CHAR,rank_xY,sendtag,
-			recvID_Xy,recvCount_Xy,MPI_CHAR,rank_Xy,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_xz,sendCount_xz,MPI_CHAR,rank_xz,sendtag,
-			recvID_XZ,recvCount_XZ,MPI_CHAR,rank_XZ,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_XZ,sendCount_XZ,MPI_CHAR,rank_XZ,sendtag,
-			recvID_xz,recvCount_xz,MPI_CHAR,rank_xz,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_Xz,sendCount_Xz,MPI_CHAR,rank_Xz,sendtag,
-			recvID_xZ,recvCount_xZ,MPI_CHAR,rank_xZ,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_xZ,sendCount_xZ,MPI_CHAR,rank_xZ,sendtag,
-			recvID_Xz,recvCount_Xz,MPI_CHAR,rank_Xz,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_yz,sendCount_yz,MPI_CHAR,rank_yz,sendtag,
-			recvID_YZ,recvCount_YZ,MPI_CHAR,rank_YZ,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_YZ,sendCount_YZ,MPI_CHAR,rank_YZ,sendtag,
-			recvID_yz,recvCount_yz,MPI_CHAR,rank_yz,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_Yz,sendCount_Yz,MPI_CHAR,rank_Yz,sendtag,
-			recvID_yZ,recvCount_yZ,MPI_CHAR,rank_yZ,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	MPI_Sendrecv(sendID_yZ,sendCount_yZ,MPI_CHAR,rank_yZ,sendtag,
-			recvID_Yz,recvCount_Yz,MPI_CHAR,rank_Yz,recvtag,MPI_COMM_WORLD,MPI_STATUS_IGNORE);
-	//......................................................................................
-	UnpackID(recvList_x, recvCount_x ,recvID_x, id);
-	UnpackID(recvList_X, recvCount_X ,recvID_X, id);
-	UnpackID(recvList_y, recvCount_y ,recvID_y, id);
-	UnpackID(recvList_Y, recvCount_Y ,recvID_Y, id);
-	UnpackID(recvList_z, recvCount_z ,recvID_z, id);
-	UnpackID(recvList_Z, recvCount_Z ,recvID_Z, id);
-	UnpackID(recvList_xy, recvCount_xy ,recvID_xy, id);
-	UnpackID(recvList_Xy, recvCount_Xy ,recvID_Xy, id);
-	UnpackID(recvList_xY, recvCount_xY ,recvID_xY, id);
-	UnpackID(recvList_XY, recvCount_XY ,recvID_XY, id);
-	UnpackID(recvList_xz, recvCount_xz ,recvID_xz, id);
-	UnpackID(recvList_Xz, recvCount_Xz ,recvID_Xz, id);
-	UnpackID(recvList_xZ, recvCount_xZ ,recvID_xZ, id);
-	UnpackID(recvList_XZ, recvCount_XZ ,recvID_XZ, id);
-	UnpackID(recvList_yz, recvCount_yz ,recvID_yz, id);
-	UnpackID(recvList_Yz, recvCount_Yz ,recvID_Yz, id);
-	UnpackID(recvList_yZ, recvCount_yZ ,recvID_yZ, id);
-	UnpackID(recvList_YZ, recvCount_YZ ,recvID_YZ, id);
-	//......................................................................................
-	// Fill in the phase MeshData from neighboring processors
-	double *sendMeshData_x, *sendMeshData_y, *sendMeshData_z, *sendMeshData_X, *sendMeshData_Y, *sendMeshData_Z;
-	double *sendMeshData_xy, *sendMeshData_yz, *sendMeshData_xz, *sendMeshData_Xy, *sendMeshData_Yz, *sendMeshData_xZ;
-	double *sendMeshData_xY, *sendMeshData_yZ, *sendMeshData_Xz, *sendMeshData_XY, *sendMeshData_YZ, *sendMeshData_XZ;
-	double *recvMeshData_x, *recvMeshData_y, *recvMeshData_z, *recvMeshData_X, *recvMeshData_Y, *recvMeshData_Z;
-	double *recvMeshData_xy, *recvMeshData_yz, *recvMeshData_xz, *recvMeshData_Xy, *recvMeshData_Yz, *recvMeshData_xZ;
-	double *recvMeshData_xY, *recvMeshData_yZ, *recvMeshData_Xz, *recvMeshData_XY, *recvMeshData_YZ, *recvMeshData_XZ;
-	// send buffers
-	sendMeshData_x = new double [sendCount_x];
-	sendMeshData_y = new double [sendCount_y];
-	sendMeshData_z = new double [sendCount_z];
-	sendMeshData_X = new double [sendCount_X];
-	sendMeshData_Y = new double [sendCount_Y];
-	sendMeshData_Z = new double [sendCount_Z];
-	sendMeshData_xy = new double [sendCount_xy];
-	sendMeshData_yz = new double [sendCount_yz];
-	sendMeshData_xz = new double [sendCount_xz];
-	sendMeshData_Xy = new double [sendCount_Xy];
-	sendMeshData_Yz = new double [sendCount_Yz];
-	sendMeshData_xZ = new double [sendCount_xZ];
-	sendMeshData_xY = new double [sendCount_xY];
-	sendMeshData_yZ = new double [sendCount_yZ];
-	sendMeshData_Xz = new double [sendCount_Xz];
-	sendMeshData_XY = new double [sendCount_XY];
-	sendMeshData_YZ = new double [sendCount_YZ];
-	sendMeshData_XZ = new double [sendCount_XZ];
-	//......................................................................................
-	// recv buffers
-	recvMeshData_x = new double [recvCount_x];
-	recvMeshData_y = new double [recvCount_y];
-	recvMeshData_z = new double [recvCount_z];
-	recvMeshData_X = new double [recvCount_X];
-	recvMeshData_Y = new double [recvCount_Y];
-	recvMeshData_Z = new double [recvCount_Z];
-	recvMeshData_xy = new double [recvCount_xy];
-	recvMeshData_yz = new double [recvCount_yz];
-	recvMeshData_xz = new double [recvCount_xz];
-	recvMeshData_Xy = new double [recvCount_Xy];
-	recvMeshData_xZ = new double [recvCount_xZ];
-	recvMeshData_xY = new double [recvCount_xY];
-	recvMeshData_yZ = new double [recvCount_yZ];
-	recvMeshData_Yz = new double [recvCount_Yz];
-	recvMeshData_Xz = new double [recvCount_Xz];
-	recvMeshData_XY = new double [recvCount_XY];
-	recvMeshData_YZ = new double [recvCount_YZ];
-	recvMeshData_XZ = new double [recvCount_XZ];
-	if (rank==0)	printf ("Devices are ready to communicate. \n");
-	MPI_Barrier(MPI_COMM_WORLD);
-
 	//...........device phase ID.................................................
 	if (rank==0)	printf ("Copying phase ID to device \n");
 	char *ID;
@@ -852,7 +353,7 @@ int main(int argc, char **argv)
 	f_odd_host = new double [9*N];
 	//...........................................................................
 
-	// Write the communcation structure into a file for debugging
+/*	// Write the communcation structure into a file for debugging
 	char LocalCommFile[40];
 	sprintf(LocalCommFile,"%s%s","Comm.",LocalRankString);
 	FILE *CommFile;
@@ -879,7 +380,7 @@ int main(int argc, char **argv)
 	fprintf(CommFile,"Yz=%d, ",rank_Yz);
 	fprintf(CommFile,"\n");
 	fclose(CommFile);
-
+*/
 	if (rank==0)	printf("Setting the distributions, size = : %i\n", N);
 	//...........................................................................
 	GlobalFlipInitD3Q19(f_even_host, f_odd_host, Nx-2, Ny-2, Nz-2,iproc,jproc,kproc,nprocx,nprocy,nprocz);
@@ -887,194 +388,17 @@ int main(int argc, char **argv)
 	CopyToDevice(f_odd, f_odd_host, 9*dist_mem_size);
 	DeviceBarrier();
 	MPI_Barrier(MPI_COMM_WORLD);
-
-	//...........................................................................
-	
-	//...................................................................................
-	PackDist(1,dvcSendList_x,0,sendCount_x,sendbuf_x,f_even,N);
-	PackDist(4,dvcSendList_x,sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-	PackDist(5,dvcSendList_x,2*sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-	PackDist(6,dvcSendList_x,3*sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-	PackDist(7,dvcSendList_x,4*sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-	//...Packing for X face(1,7,9,11,13)................................
-	PackDist(0,dvcSendList_X,0,sendCount_X,sendbuf_X,f_odd,N);
-	PackDist(3,dvcSendList_X,sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-	PackDist(4,dvcSendList_X,2*sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-	PackDist(5,dvcSendList_X,3*sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-	PackDist(6,dvcSendList_X,4*sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-	//...Packing for y face(4,8,9,16,18).................................
-	PackDist(2,dvcSendList_y,0,sendCount_y,sendbuf_y,f_even,N);
-	PackDist(4,dvcSendList_y,sendCount_y,sendCount_y,sendbuf_y,f_even,N);
-	PackDist(4,dvcSendList_y,2*sendCount_y,sendCount_y,sendbuf_y,f_odd,N);
-	PackDist(8,dvcSendList_y,3*sendCount_y,sendCount_y,sendbuf_y,f_even,N);
-	PackDist(9,dvcSendList_y,4*sendCount_y,sendCount_y,sendbuf_y,f_even,N);
-	//...Packing for Y face(3,7,10,15,17).................................
-	PackDist(1,dvcSendList_Y,0,sendCount_Y,sendbuf_Y,f_odd,N);
-	PackDist(3,dvcSendList_Y,sendCount_Y,sendCount_Y,sendbuf_Y,f_odd,N);
-	PackDist(5,dvcSendList_Y,2*sendCount_Y,sendCount_Y,sendbuf_Y,f_even,N);
-	PackDist(7,dvcSendList_Y,3*sendCount_Y,sendCount_Y,sendbuf_Y,f_odd,N);
-	PackDist(8,dvcSendList_Y,4*sendCount_Y,sendCount_Y,sendbuf_Y,f_odd,N);
-	//...Packing for z face(6,12,13,16,17)................................
-	PackDist(3,dvcSendList_z,0,sendCount_z,sendbuf_z,f_even,N);
-	PackDist(6,dvcSendList_z,sendCount_z,sendCount_z,sendbuf_z,f_even,N);
-	PackDist(6,dvcSendList_z,2*sendCount_z,sendCount_z,sendbuf_z,f_odd,N);
-	PackDist(8,dvcSendList_z,3*sendCount_z,sendCount_z,sendbuf_z,f_even,N);
-	PackDist(8,dvcSendList_z,4*sendCount_z,sendCount_z,sendbuf_z,f_odd,N);
-	//...Packing for Z face(5,11,14,15,18)................................
-	PackDist(2,dvcSendList_Z,0,sendCount_Z,sendbuf_Z,f_odd,N);
-	PackDist(5,dvcSendList_Z,sendCount_Z,sendCount_Z,sendbuf_Z,f_odd,N);
-	PackDist(7,dvcSendList_Z,2*sendCount_Z,sendCount_Z,sendbuf_Z,f_even,N);
-	PackDist(7,dvcSendList_Z,3*sendCount_Z,sendCount_Z,sendbuf_Z,f_odd,N);
-	PackDist(9,dvcSendList_Z,4*sendCount_Z,sendCount_Z,sendbuf_Z,f_even,N);
-	//...Pack the xy edge (8)................................
-	PackDist(4,dvcSendList_xy,0,sendCount_xy,sendbuf_xy,f_even,N);
-	//...Pack the Xy edge (9)................................
-	PackDist(4,dvcSendList_Xy,0,sendCount_Xy,sendbuf_Xy,f_odd,N);
-	//...Pack the xY edge (10)................................
-	PackDist(5,dvcSendList_xY,0,sendCount_xY,sendbuf_xY,f_even,N);
-	//...Pack the XY edge (7)................................
-	PackDist(3,dvcSendList_XY,0,sendCount_XY,sendbuf_XY,f_odd,N);
-	//...Pack the xz edge (12)................................
-	PackDist(6,dvcSendList_xz,0,sendCount_xz,sendbuf_xz,f_even,N);
-	//...Pack the xZ edge (14)................................
-	PackDist(7,dvcSendList_xZ,0,sendCount_xZ,sendbuf_xZ,f_even,N);
-	//...Pack the Xz edge (13)................................
-	PackDist(6,dvcSendList_Xz,0,sendCount_Xz,sendbuf_Xz,f_odd,N);
-	//...Pack the XZ edge (11)................................
-	PackDist(5,dvcSendList_XZ,0,sendCount_XZ,sendbuf_XZ,f_odd,N);
-	//...Pack the xz edge (12)................................
-	//...Pack the yz edge (16)................................
-	PackDist(8,dvcSendList_yz,0,sendCount_yz,sendbuf_yz,f_even,N);
-	//...Pack the yZ edge (18)................................
-	PackDist(9,dvcSendList_yZ,0,sendCount_yZ,sendbuf_yZ,f_even,N);
-	//...Pack the Yz edge (17)................................
-	PackDist(8,dvcSendList_Yz,0,sendCount_Yz,sendbuf_Yz,f_odd,N);
-	//...Pack the YZ edge (15)................................
-	PackDist(7,dvcSendList_YZ,0,sendCount_YZ,sendbuf_YZ,f_odd,N);
-	//...................................................................................
-
-	//...................................................................................
-	// Send all the distributions
-	MPI_Isend(sendbuf_x, 5*sendCount_x,MPI_DOUBLE,rank_x,sendtag,MPI_COMM_WORLD,&req1[0]);
-	MPI_Irecv(recvbuf_X, 5*recvCount_X,MPI_DOUBLE,rank_X,recvtag,MPI_COMM_WORLD,&req2[0]);
-	MPI_Isend(sendbuf_X, 5*sendCount_X,MPI_DOUBLE,rank_X,sendtag,MPI_COMM_WORLD,&req1[1]);
-	MPI_Irecv(recvbuf_x, 5*recvCount_x,MPI_DOUBLE,rank_x,recvtag,MPI_COMM_WORLD,&req2[1]);
-	MPI_Isend(sendbuf_y, 5*sendCount_y,MPI_DOUBLE,rank_y,sendtag,MPI_COMM_WORLD,&req1[2]);
-	MPI_Irecv(recvbuf_Y, 5*recvCount_Y,MPI_DOUBLE,rank_Y,recvtag,MPI_COMM_WORLD,&req2[2]);
-	MPI_Isend(sendbuf_Y, 5*sendCount_Y,MPI_DOUBLE,rank_Y,sendtag,MPI_COMM_WORLD,&req1[3]);
-	MPI_Irecv(recvbuf_y, 5*recvCount_y,MPI_DOUBLE,rank_y,recvtag,MPI_COMM_WORLD,&req2[3]);
-	MPI_Isend(sendbuf_z, 5*sendCount_z,MPI_DOUBLE,rank_z,sendtag,MPI_COMM_WORLD,&req1[4]);
-	MPI_Irecv(recvbuf_Z, 5*recvCount_Z,MPI_DOUBLE,rank_Z,recvtag,MPI_COMM_WORLD,&req2[4]);
-	MPI_Isend(sendbuf_Z, 5*sendCount_Z,MPI_DOUBLE,rank_Z,sendtag,MPI_COMM_WORLD,&req1[5]);
-	MPI_Irecv(recvbuf_z, 5*recvCount_z,MPI_DOUBLE,rank_z,recvtag,MPI_COMM_WORLD,&req2[5]);
-	MPI_Isend(sendbuf_xy, sendCount_xy,MPI_DOUBLE,rank_xy,sendtag,MPI_COMM_WORLD,&req1[6]);
-	MPI_Irecv(recvbuf_XY, recvCount_XY,MPI_DOUBLE,rank_XY,recvtag,MPI_COMM_WORLD,&req2[6]);
-	MPI_Isend(sendbuf_XY, sendCount_XY,MPI_DOUBLE,rank_XY,sendtag,MPI_COMM_WORLD,&req1[7]);
-	MPI_Irecv(recvbuf_xy, recvCount_xy,MPI_DOUBLE,rank_xy,recvtag,MPI_COMM_WORLD,&req2[7]);
-	MPI_Isend(sendbuf_Xy, sendCount_Xy,MPI_DOUBLE,rank_Xy,sendtag,MPI_COMM_WORLD,&req1[8]);
-	MPI_Irecv(recvbuf_xY, recvCount_xY,MPI_DOUBLE,rank_xY,recvtag,MPI_COMM_WORLD,&req2[8]);
-	MPI_Isend(sendbuf_xY, sendCount_xY,MPI_DOUBLE,rank_xY,sendtag,MPI_COMM_WORLD,&req1[9]);
-	MPI_Irecv(recvbuf_Xy, recvCount_Xy,MPI_DOUBLE,rank_Xy,recvtag,MPI_COMM_WORLD,&req2[9]);
-	MPI_Isend(sendbuf_xz, sendCount_xz,MPI_DOUBLE,rank_xz,sendtag,MPI_COMM_WORLD,&req1[10]);
-	MPI_Irecv(recvbuf_XZ, recvCount_XZ,MPI_DOUBLE,rank_XZ,recvtag,MPI_COMM_WORLD,&req2[10]);
-	MPI_Isend(sendbuf_XZ, sendCount_XZ,MPI_DOUBLE,rank_XZ,sendtag,MPI_COMM_WORLD,&req1[11]);
-	MPI_Irecv(recvbuf_xz, recvCount_xz,MPI_DOUBLE,rank_xz,recvtag,MPI_COMM_WORLD,&req2[11]);
-	MPI_Isend(sendbuf_Xz, sendCount_Xz,MPI_DOUBLE,rank_Xz,sendtag,MPI_COMM_WORLD,&req1[12]);
-	MPI_Irecv(recvbuf_xZ, recvCount_xZ,MPI_DOUBLE,rank_xZ,recvtag,MPI_COMM_WORLD,&req2[12]);
-	MPI_Isend(sendbuf_xZ, sendCount_xZ,MPI_DOUBLE,rank_xZ,sendtag,MPI_COMM_WORLD,&req1[13]);
-	MPI_Irecv(recvbuf_Xz, recvCount_Xz,MPI_DOUBLE,rank_Xz,recvtag,MPI_COMM_WORLD,&req2[13]);
-	MPI_Isend(sendbuf_yz, sendCount_yz,MPI_DOUBLE,rank_yz,sendtag,MPI_COMM_WORLD,&req1[14]);
-	MPI_Irecv(recvbuf_YZ, recvCount_YZ,MPI_DOUBLE,rank_YZ,recvtag,MPI_COMM_WORLD,&req2[14]);
-	MPI_Isend(sendbuf_YZ, sendCount_YZ,MPI_DOUBLE,rank_YZ,sendtag,MPI_COMM_WORLD,&req1[15]);
-	MPI_Irecv(recvbuf_yz, recvCount_yz,MPI_DOUBLE,rank_yz,recvtag,MPI_COMM_WORLD,&req2[15]);
-	MPI_Isend(sendbuf_Yz, sendCount_Yz,MPI_DOUBLE,rank_Yz,sendtag,MPI_COMM_WORLD,&req1[16]);
-	MPI_Irecv(recvbuf_yZ, recvCount_yZ,MPI_DOUBLE,rank_yZ,recvtag,MPI_COMM_WORLD,&req2[16]);
-	MPI_Isend(sendbuf_yZ, sendCount_yZ,MPI_DOUBLE,rank_yZ,sendtag,MPI_COMM_WORLD,&req1[17]);
-	MPI_Irecv(recvbuf_Yz, recvCount_Yz,MPI_DOUBLE,rank_Yz,recvtag,MPI_COMM_WORLD,&req2[17]);
-	//...................................................................................
-	
+	//*************************************************************************
+	// Pack and send the D3Q19 distributions
+	ScaLBL_Comm.SendD3Q19(f_even, f_odd);
 	//*************************************************************************
 	// 		Swap the distributions for momentum transport
 	//*************************************************************************
 	SwapD3Q19(ID, f_even, f_odd, Nx, Ny, Nz);
 	//*************************************************************************
-	
-	//...................................................................................
-	// Wait for completion of D3Q19 communication
-	MPI_Waitall(18,req1,stat1);
-	MPI_Waitall(18,req2,stat2);
-	
-	//...................................................................................
-	// Unpack the distributions on the device
-	//...................................................................................
-	//...Map recieve list for the X face: q=2,8,10,12,13 .................................
-	UnpackDist(0,-1,0,0,dvcRecvList_X,0,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-	UnpackDist(3,-1,-1,0,dvcRecvList_X,recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-	UnpackDist(4,-1,1,0,dvcRecvList_X,2*recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-	UnpackDist(5,-1,0,-1,dvcRecvList_X,3*recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-	UnpackDist(6,-1,0,1,dvcRecvList_X,4*recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-	//...................................................................................
-	//...Map recieve list for the x face: q=1,7,9,11,13..................................
-	UnpackDist(1,1,0,0,dvcRecvList_x,0,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-	UnpackDist(4,1,1,0,dvcRecvList_x,recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-	UnpackDist(5,1,-1,0,dvcRecvList_x,2*recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-	UnpackDist(6,1,0,1,dvcRecvList_x,3*recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-	UnpackDist(7,1,0,-1,dvcRecvList_x,4*recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-	//...................................................................................
-	//...Map recieve list for the y face: q=4,8,9,16,18 ...................................
-	UnpackDist(1,0,-1,0,dvcRecvList_Y,0,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-	UnpackDist(3,-1,-1,0,dvcRecvList_Y,recvCount_Y,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-	UnpackDist(5,1,-1,0,dvcRecvList_Y,2*recvCount_Y,recvCount_Y,recvbuf_Y,f_even,Nx,Ny,Nz);
-	UnpackDist(7,0,-1,-1,dvcRecvList_Y,3*recvCount_Y,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-	UnpackDist(8,0,-1,1,dvcRecvList_Y,4*recvCount_Y,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-	//...................................................................................
-	//...Map recieve list for the Y face: q=3,7,10,15,17 ..................................
-	UnpackDist(2,0,1,0,dvcRecvList_y,0,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-	UnpackDist(4,1,1,0,dvcRecvList_y,recvCount_y,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-	UnpackDist(4,-1,1,0,dvcRecvList_y,2*recvCount_y,recvCount_y,recvbuf_y,f_odd,Nx,Ny,Nz);
-	UnpackDist(8,0,1,1,dvcRecvList_y,3*recvCount_y,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-	UnpackDist(9,0,1,-1,dvcRecvList_y,4*recvCount_y,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-	//...................................................................................
-	//...Map recieve list for the z face<<<6,12,13,16,17)..............................................
-	UnpackDist(2,0,0,-1,dvcRecvList_Z,0,recvCount_Z,recvbuf_Z,f_odd,Nx,Ny,Nz);
-	UnpackDist(5,-1,0,-1,dvcRecvList_Z,recvCount_Z,recvCount_Z,recvbuf_Z,f_odd,Nx,Ny,Nz);
-	UnpackDist(7,1,0,-1,dvcRecvList_Z,2*recvCount_Z,recvCount_Z,recvbuf_Z,f_even,Nx,Ny,Nz);
-	UnpackDist(7,0,-1,-1,dvcRecvList_Z,3*recvCount_Z,recvCount_Z,recvbuf_Z,f_odd,Nx,Ny,Nz);
-	UnpackDist(9,0,1,-1,dvcRecvList_Z,4*recvCount_Z,recvCount_Z,recvbuf_Z,f_even,Nx,Ny,Nz);
-	//...Map recieve list for the Z face<<<5,11,14,15,18)..............................................
-	UnpackDist(3,0,0,1,dvcRecvList_z,0,recvCount_z,recvbuf_z,f_even,Nx,Ny,Nz);
-	UnpackDist(6,1,0,1,dvcRecvList_z,recvCount_z,recvCount_z,recvbuf_z,f_even,Nx,Ny,Nz);
-	UnpackDist(6,-1,0,1,dvcRecvList_z,2*recvCount_z,recvCount_z,recvbuf_z,f_odd,Nx,Ny,Nz);
-	UnpackDist(8,0,1,1,dvcRecvList_z,3*recvCount_z,recvCount_z,recvbuf_z,f_even,Nx,Ny,Nz);
-	UnpackDist(8,0,-1,1,dvcRecvList_z,4*recvCount_z,recvCount_z,recvbuf_z,f_odd,Nx,Ny,Nz);
-	//..................................................................................
-	//...Map recieve list for the xy edge <<<8)................................
-	UnpackDist(3,-1,-1,0,dvcRecvList_XY,0,recvCount_XY,recvbuf_XY,f_odd,Nx,Ny,Nz);
-	//...Map recieve list for the Xy edge <<<9)................................
-	UnpackDist(5,1,-1,0,dvcRecvList_xY,0,recvCount_xY,recvbuf_xY,f_even,Nx,Ny,Nz);
-	//...Map recieve list for the xY edge <<<10)................................
-	UnpackDist(4,-1,1,0,dvcRecvList_Xy,0,recvCount_Xy,recvbuf_Xy,f_odd,Nx,Ny,Nz);
-	//...Map recieve list for the XY edge <<<7)................................
-	UnpackDist(4,1,1,0,dvcRecvList_xy,0,recvCount_xy,recvbuf_xy,f_even,Nx,Ny,Nz);
-	//...Map recieve list for the xz edge <<<12)................................
-	UnpackDist(5,-1,0,-1,dvcRecvList_XZ,0,recvCount_XZ,recvbuf_XZ,f_odd,Nx,Ny,Nz);
-	//...Map recieve list for the xZ edge <<<14)................................
-	UnpackDist(6,-1,0,1,dvcRecvList_Xz,0,recvCount_Xz,recvbuf_Xz,f_odd,Nx,Ny,Nz);
-	//...Map recieve list for the Xz edge <<<13)................................
-	UnpackDist(7,1,0,-1,dvcRecvList_xZ,0,recvCount_xZ,recvbuf_xZ,f_even,Nx,Ny,Nz);
-	//...Map recieve list for the XZ edge <<<11)................................
-	UnpackDist(6,1,0,1,dvcRecvList_xz,0,recvCount_xz,recvbuf_xz,f_even,Nx,Ny,Nz);
-	//...Map recieve list for the yz edge <<<16)................................
-	UnpackDist(7,0,-1,-1,dvcRecvList_YZ,0,recvCount_YZ,recvbuf_YZ,f_odd,Nx,Ny,Nz);
-	//...Map recieve list for the yZ edge <<<18)................................
-	UnpackDist(8,0,-1,1,dvcRecvList_Yz,0,recvCount_Yz,recvbuf_Yz,f_odd,Nx,Ny,Nz);
-	//...Map recieve list for the Yz edge <<<17)................................
-	UnpackDist(9,0,1,-1,dvcRecvList_yZ,0,recvCount_yZ,recvbuf_yZ,f_even,Nx,Ny,Nz);
-	//...Map recieve list for the YZ edge <<<15)................................
-	UnpackDist(8,0,1,1,dvcRecvList_yz,0,recvCount_yz,recvbuf_yz,f_even,Nx,Ny,Nz);
-	//...................................................................................
-	DeviceBarrier();
-	MPI_Barrier(MPI_COMM_WORLD);
+	// Wait for communications to complete and unpack the distributions
+	ScaLBL_Comm.RecvD3Q19(f_even, f_odd);
+	//*************************************************************************
 
 	//...........................................................................	
 	int check;
@@ -1098,189 +422,17 @@ int main(int argc, char **argv)
 	//************ MAIN ITERATION LOOP (timing communications)***************************************/
 	while (timestep < 100){
 
-		//...................................................................................
-		PackDist(1,dvcSendList_x,0,sendCount_x,sendbuf_x,f_even,N);
-		PackDist(4,dvcSendList_x,sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-		PackDist(5,dvcSendList_x,2*sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-		PackDist(6,dvcSendList_x,3*sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-		PackDist(7,dvcSendList_x,4*sendCount_x,sendCount_x,sendbuf_x,f_even,N);
-		//...Packing for X face(1,7,9,11,13)................................
-		PackDist(0,dvcSendList_X,0,sendCount_X,sendbuf_X,f_odd,N);
-		PackDist(3,dvcSendList_X,sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-		PackDist(4,dvcSendList_X,2*sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-		PackDist(5,dvcSendList_X,3*sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-		PackDist(6,dvcSendList_X,4*sendCount_X,sendCount_X,sendbuf_X,f_odd,N);
-		//...Packing for y face(4,8,9,16,18).................................
-		PackDist(2,dvcSendList_y,0,sendCount_y,sendbuf_y,f_even,N);
-		PackDist(4,dvcSendList_y,sendCount_y,sendCount_y,sendbuf_y,f_even,N);
-		PackDist(4,dvcSendList_y,2*sendCount_y,sendCount_y,sendbuf_y,f_odd,N);
-		PackDist(8,dvcSendList_y,3*sendCount_y,sendCount_y,sendbuf_y,f_even,N);
-		PackDist(9,dvcSendList_y,4*sendCount_y,sendCount_y,sendbuf_y,f_even,N);
-		//...Packing for Y face(3,7,10,15,17).................................
-		PackDist(1,dvcSendList_Y,0,sendCount_Y,sendbuf_Y,f_odd,N);
-		PackDist(3,dvcSendList_Y,sendCount_Y,sendCount_Y,sendbuf_Y,f_odd,N);
-		PackDist(5,dvcSendList_Y,2*sendCount_Y,sendCount_Y,sendbuf_Y,f_even,N);
-		PackDist(7,dvcSendList_Y,3*sendCount_Y,sendCount_Y,sendbuf_Y,f_odd,N);
-		PackDist(8,dvcSendList_Y,4*sendCount_Y,sendCount_Y,sendbuf_Y,f_odd,N);
-		//...Packing for z face(6,12,13,16,17)................................
-		PackDist(3,dvcSendList_z,0,sendCount_z,sendbuf_z,f_even,N);
-		PackDist(6,dvcSendList_z,sendCount_z,sendCount_z,sendbuf_z,f_even,N);
-		PackDist(6,dvcSendList_z,2*sendCount_z,sendCount_z,sendbuf_z,f_odd,N);
-		PackDist(8,dvcSendList_z,3*sendCount_z,sendCount_z,sendbuf_z,f_even,N);
-		PackDist(8,dvcSendList_z,4*sendCount_z,sendCount_z,sendbuf_z,f_odd,N);
-		//...Packing for Z face(5,11,14,15,18)................................
-		PackDist(2,dvcSendList_Z,0,sendCount_Z,sendbuf_Z,f_odd,N);
-		PackDist(5,dvcSendList_Z,sendCount_Z,sendCount_Z,sendbuf_Z,f_odd,N);
-		PackDist(7,dvcSendList_Z,2*sendCount_Z,sendCount_Z,sendbuf_Z,f_even,N);
-		PackDist(7,dvcSendList_Z,3*sendCount_Z,sendCount_Z,sendbuf_Z,f_odd,N);
-		PackDist(9,dvcSendList_Z,4*sendCount_Z,sendCount_Z,sendbuf_Z,f_even,N);
-		//...Pack the xy edge (8)................................
-		PackDist(4,dvcSendList_xy,0,sendCount_xy,sendbuf_xy,f_even,N);
-		//...Pack the Xy edge (9)................................
-		PackDist(4,dvcSendList_Xy,0,sendCount_Xy,sendbuf_Xy,f_odd,N);
-		//...Pack the xY edge (10)................................
-		PackDist(5,dvcSendList_xY,0,sendCount_xY,sendbuf_xY,f_even,N);
-		//...Pack the XY edge (7)................................
-		PackDist(3,dvcSendList_XY,0,sendCount_XY,sendbuf_XY,f_odd,N);
-		//...Pack the xz edge (12)................................
-		PackDist(6,dvcSendList_xz,0,sendCount_xz,sendbuf_xz,f_even,N);
-		//...Pack the xZ edge (14)................................
-		PackDist(7,dvcSendList_xZ,0,sendCount_xZ,sendbuf_xZ,f_even,N);
-		//...Pack the Xz edge (13)................................
-		PackDist(6,dvcSendList_Xz,0,sendCount_Xz,sendbuf_Xz,f_odd,N);
-		//...Pack the XZ edge (11)................................
-		PackDist(5,dvcSendList_XZ,0,sendCount_XZ,sendbuf_XZ,f_odd,N);
-		//...Pack the xz edge (12)................................
-		//...Pack the yz edge (16)................................
-		PackDist(8,dvcSendList_yz,0,sendCount_yz,sendbuf_yz,f_even,N);
-		//...Pack the yZ edge (18)................................
-		PackDist(9,dvcSendList_yZ,0,sendCount_yZ,sendbuf_yZ,f_even,N);
-		//...Pack the Yz edge (17)................................
-		PackDist(8,dvcSendList_Yz,0,sendCount_Yz,sendbuf_Yz,f_odd,N);
-		//...Pack the YZ edge (15)................................
-		PackDist(7,dvcSendList_YZ,0,sendCount_YZ,sendbuf_YZ,f_odd,N);
-		//...................................................................................
-
-		//...................................................................................
-		// Send all the distributions
-		MPI_Isend(sendbuf_x, 5*sendCount_x,MPI_DOUBLE,rank_x,sendtag,MPI_COMM_WORLD,&req1[0]);
-		MPI_Irecv(recvbuf_X, 5*recvCount_X,MPI_DOUBLE,rank_X,recvtag,MPI_COMM_WORLD,&req2[0]);
-		MPI_Isend(sendbuf_X, 5*sendCount_X,MPI_DOUBLE,rank_X,sendtag,MPI_COMM_WORLD,&req1[1]);
-		MPI_Irecv(recvbuf_x, 5*recvCount_x,MPI_DOUBLE,rank_x,recvtag,MPI_COMM_WORLD,&req2[1]);
-		MPI_Isend(sendbuf_y, 5*sendCount_y,MPI_DOUBLE,rank_y,sendtag,MPI_COMM_WORLD,&req1[2]);
-		MPI_Irecv(recvbuf_Y, 5*recvCount_Y,MPI_DOUBLE,rank_Y,recvtag,MPI_COMM_WORLD,&req2[2]);
-		MPI_Isend(sendbuf_Y, 5*sendCount_Y,MPI_DOUBLE,rank_Y,sendtag,MPI_COMM_WORLD,&req1[3]);
-		MPI_Irecv(recvbuf_y, 5*recvCount_y,MPI_DOUBLE,rank_y,recvtag,MPI_COMM_WORLD,&req2[3]);
-		MPI_Isend(sendbuf_z, 5*sendCount_z,MPI_DOUBLE,rank_z,sendtag,MPI_COMM_WORLD,&req1[4]);
-		MPI_Irecv(recvbuf_Z, 5*recvCount_Z,MPI_DOUBLE,rank_Z,recvtag,MPI_COMM_WORLD,&req2[4]);
-		MPI_Isend(sendbuf_Z, 5*sendCount_Z,MPI_DOUBLE,rank_Z,sendtag,MPI_COMM_WORLD,&req1[5]);
-		MPI_Irecv(recvbuf_z, 5*recvCount_z,MPI_DOUBLE,rank_z,recvtag,MPI_COMM_WORLD,&req2[5]);
-		MPI_Isend(sendbuf_xy, sendCount_xy,MPI_DOUBLE,rank_xy,sendtag,MPI_COMM_WORLD,&req1[6]);
-		MPI_Irecv(recvbuf_XY, recvCount_XY,MPI_DOUBLE,rank_XY,recvtag,MPI_COMM_WORLD,&req2[6]);
-		MPI_Isend(sendbuf_XY, sendCount_XY,MPI_DOUBLE,rank_XY,sendtag,MPI_COMM_WORLD,&req1[7]);
-		MPI_Irecv(recvbuf_xy, recvCount_xy,MPI_DOUBLE,rank_xy,recvtag,MPI_COMM_WORLD,&req2[7]);
-		MPI_Isend(sendbuf_Xy, sendCount_Xy,MPI_DOUBLE,rank_Xy,sendtag,MPI_COMM_WORLD,&req1[8]);
-		MPI_Irecv(recvbuf_xY, recvCount_xY,MPI_DOUBLE,rank_xY,recvtag,MPI_COMM_WORLD,&req2[8]);
-		MPI_Isend(sendbuf_xY, sendCount_xY,MPI_DOUBLE,rank_xY,sendtag,MPI_COMM_WORLD,&req1[9]);
-		MPI_Irecv(recvbuf_Xy, recvCount_Xy,MPI_DOUBLE,rank_Xy,recvtag,MPI_COMM_WORLD,&req2[9]);
-		MPI_Isend(sendbuf_xz, sendCount_xz,MPI_DOUBLE,rank_xz,sendtag,MPI_COMM_WORLD,&req1[10]);
-		MPI_Irecv(recvbuf_XZ, recvCount_XZ,MPI_DOUBLE,rank_XZ,recvtag,MPI_COMM_WORLD,&req2[10]);
-		MPI_Isend(sendbuf_XZ, sendCount_XZ,MPI_DOUBLE,rank_XZ,sendtag,MPI_COMM_WORLD,&req1[11]);
-		MPI_Irecv(recvbuf_xz, recvCount_xz,MPI_DOUBLE,rank_xz,recvtag,MPI_COMM_WORLD,&req2[11]);
-		MPI_Isend(sendbuf_Xz, sendCount_Xz,MPI_DOUBLE,rank_Xz,sendtag,MPI_COMM_WORLD,&req1[12]);
-		MPI_Irecv(recvbuf_xZ, recvCount_xZ,MPI_DOUBLE,rank_xZ,recvtag,MPI_COMM_WORLD,&req2[12]);
-		MPI_Isend(sendbuf_xZ, sendCount_xZ,MPI_DOUBLE,rank_xZ,sendtag,MPI_COMM_WORLD,&req1[13]);
-		MPI_Irecv(recvbuf_Xz, recvCount_Xz,MPI_DOUBLE,rank_Xz,recvtag,MPI_COMM_WORLD,&req2[13]);
-		MPI_Isend(sendbuf_yz, sendCount_yz,MPI_DOUBLE,rank_yz,sendtag,MPI_COMM_WORLD,&req1[14]);
-		MPI_Irecv(recvbuf_YZ, recvCount_YZ,MPI_DOUBLE,rank_YZ,recvtag,MPI_COMM_WORLD,&req2[14]);
-		MPI_Isend(sendbuf_YZ, sendCount_YZ,MPI_DOUBLE,rank_YZ,sendtag,MPI_COMM_WORLD,&req1[15]);
-		MPI_Irecv(recvbuf_yz, recvCount_yz,MPI_DOUBLE,rank_yz,recvtag,MPI_COMM_WORLD,&req2[15]);
-		MPI_Isend(sendbuf_Yz, sendCount_Yz,MPI_DOUBLE,rank_Yz,sendtag,MPI_COMM_WORLD,&req1[16]);
-		MPI_Irecv(recvbuf_yZ, recvCount_yZ,MPI_DOUBLE,rank_yZ,recvtag,MPI_COMM_WORLD,&req2[16]);
-		MPI_Isend(sendbuf_yZ, sendCount_yZ,MPI_DOUBLE,rank_yZ,sendtag,MPI_COMM_WORLD,&req1[17]);
-		MPI_Irecv(recvbuf_Yz, recvCount_Yz,MPI_DOUBLE,rank_Yz,recvtag,MPI_COMM_WORLD,&req2[17]);
-		//...................................................................................
-
+		//*************************************************************************
+		// Pack and send the D3Q19 distributions
+		ScaLBL_Comm.SendD3Q19(f_even, f_odd);
 		//*************************************************************************
 		// 		Swap the distributions for momentum transport
 		//*************************************************************************
 		SwapD3Q19(ID, f_even, f_odd, Nx, Ny, Nz);
 		//*************************************************************************
-
-		//...................................................................................
-		// Wait for completion of D3Q19 communication
-		MPI_Waitall(18,req1,stat1);
-		MPI_Waitall(18,req2,stat2);
-
-		//...................................................................................
-		// Unpack the distributions on the device
-		//...................................................................................
-		//...Map recieve list for the X face: q=2,8,10,12,13 .................................
-		UnpackDist(0,-1,0,0,dvcRecvList_X,0,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-		UnpackDist(3,-1,-1,0,dvcRecvList_X,recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-		UnpackDist(4,-1,1,0,dvcRecvList_X,2*recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-		UnpackDist(5,-1,0,-1,dvcRecvList_X,3*recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-		UnpackDist(6,-1,0,1,dvcRecvList_X,4*recvCount_X,recvCount_X,recvbuf_X,f_odd,Nx,Ny,Nz);
-		//...................................................................................
-		//...Map recieve list for the x face: q=1,7,9,11,13..................................
-		UnpackDist(1,1,0,0,dvcRecvList_x,0,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-		UnpackDist(4,1,1,0,dvcRecvList_x,recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-		UnpackDist(5,1,-1,0,dvcRecvList_x,2*recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-		UnpackDist(6,1,0,1,dvcRecvList_x,3*recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-		UnpackDist(7,1,0,-1,dvcRecvList_x,4*recvCount_x,recvCount_x,recvbuf_x,f_even,Nx,Ny,Nz);
-		//...................................................................................
-		//...Map recieve list for the y face: q=4,8,9,16,18 ...................................
-		UnpackDist(1,0,-1,0,dvcRecvList_Y,0,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-		UnpackDist(3,-1,-1,0,dvcRecvList_Y,recvCount_Y,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-		UnpackDist(5,1,-1,0,dvcRecvList_Y,2*recvCount_Y,recvCount_Y,recvbuf_Y,f_even,Nx,Ny,Nz);
-		UnpackDist(7,0,-1,-1,dvcRecvList_Y,3*recvCount_Y,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-		UnpackDist(8,0,-1,1,dvcRecvList_Y,4*recvCount_Y,recvCount_Y,recvbuf_Y,f_odd,Nx,Ny,Nz);
-		//...................................................................................
-		//...Map recieve list for the Y face: q=3,7,10,15,17 ..................................
-		UnpackDist(2,0,1,0,dvcRecvList_y,0,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-		UnpackDist(4,1,1,0,dvcRecvList_y,recvCount_y,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-		UnpackDist(4,-1,1,0,dvcRecvList_y,2*recvCount_y,recvCount_y,recvbuf_y,f_odd,Nx,Ny,Nz);
-		UnpackDist(8,0,1,1,dvcRecvList_y,3*recvCount_y,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-		UnpackDist(9,0,1,-1,dvcRecvList_y,4*recvCount_y,recvCount_y,recvbuf_y,f_even,Nx,Ny,Nz);
-		//...................................................................................
-		//...Map recieve list for the z face<<<6,12,13,16,17)..............................................
-		UnpackDist(2,0,0,-1,dvcRecvList_Z,0,recvCount_Z,recvbuf_Z,f_odd,Nx,Ny,Nz);
-		UnpackDist(5,-1,0,-1,dvcRecvList_Z,recvCount_Z,recvCount_Z,recvbuf_Z,f_odd,Nx,Ny,Nz);
-		UnpackDist(7,1,0,-1,dvcRecvList_Z,2*recvCount_Z,recvCount_Z,recvbuf_Z,f_even,Nx,Ny,Nz);
-		UnpackDist(7,0,-1,-1,dvcRecvList_Z,3*recvCount_Z,recvCount_Z,recvbuf_Z,f_odd,Nx,Ny,Nz);
-		UnpackDist(9,0,1,-1,dvcRecvList_Z,4*recvCount_Z,recvCount_Z,recvbuf_Z,f_even,Nx,Ny,Nz);
-		//...Map recieve list for the Z face<<<5,11,14,15,18)..............................................
-		UnpackDist(3,0,0,1,dvcRecvList_z,0,recvCount_z,recvbuf_z,f_even,Nx,Ny,Nz);
-		UnpackDist(6,1,0,1,dvcRecvList_z,recvCount_z,recvCount_z,recvbuf_z,f_even,Nx,Ny,Nz);
-		UnpackDist(6,-1,0,1,dvcRecvList_z,2*recvCount_z,recvCount_z,recvbuf_z,f_odd,Nx,Ny,Nz);
-		UnpackDist(8,0,1,1,dvcRecvList_z,3*recvCount_z,recvCount_z,recvbuf_z,f_even,Nx,Ny,Nz);
-		UnpackDist(8,0,-1,1,dvcRecvList_z,4*recvCount_z,recvCount_z,recvbuf_z,f_odd,Nx,Ny,Nz);
-		//..................................................................................
-		//...Map recieve list for the xy edge <<<8)................................
-		UnpackDist(3,-1,-1,0,dvcRecvList_XY,0,recvCount_XY,recvbuf_XY,f_odd,Nx,Ny,Nz);
-		//...Map recieve list for the Xy edge <<<9)................................
-		UnpackDist(5,1,-1,0,dvcRecvList_xY,0,recvCount_xY,recvbuf_xY,f_even,Nx,Ny,Nz);
-		//...Map recieve list for the xY edge <<<10)................................
-		UnpackDist(4,-1,1,0,dvcRecvList_Xy,0,recvCount_Xy,recvbuf_Xy,f_odd,Nx,Ny,Nz);
-		//...Map recieve list for the XY edge <<<7)................................
-		UnpackDist(4,1,1,0,dvcRecvList_xy,0,recvCount_xy,recvbuf_xy,f_even,Nx,Ny,Nz);
-		//...Map recieve list for the xz edge <<<12)................................
-		UnpackDist(5,-1,0,-1,dvcRecvList_XZ,0,recvCount_XZ,recvbuf_XZ,f_odd,Nx,Ny,Nz);
-		//...Map recieve list for the xZ edge <<<14)................................
-		UnpackDist(6,-1,0,1,dvcRecvList_Xz,0,recvCount_Xz,recvbuf_Xz,f_odd,Nx,Ny,Nz);
-		//...Map recieve list for the Xz edge <<<13)................................
-		UnpackDist(7,1,0,-1,dvcRecvList_xZ,0,recvCount_xZ,recvbuf_xZ,f_even,Nx,Ny,Nz);
-		//...Map recieve list for the XZ edge <<<11)................................
-		UnpackDist(6,1,0,1,dvcRecvList_xz,0,recvCount_xz,recvbuf_xz,f_even,Nx,Ny,Nz);
-		//...Map recieve list for the yz edge <<<16)................................
-		UnpackDist(7,0,-1,-1,dvcRecvList_YZ,0,recvCount_YZ,recvbuf_YZ,f_odd,Nx,Ny,Nz);
-		//...Map recieve list for the yZ edge <<<18)................................
-		UnpackDist(8,0,-1,1,dvcRecvList_Yz,0,recvCount_Yz,recvbuf_Yz,f_odd,Nx,Ny,Nz);
-		//...Map recieve list for the Yz edge <<<17)................................
-		UnpackDist(9,0,1,-1,dvcRecvList_yZ,0,recvCount_yZ,recvbuf_yZ,f_even,Nx,Ny,Nz);
-		//...Map recieve list for the YZ edge <<<15)................................
-		UnpackDist(8,0,1,1,dvcRecvList_yz,0,recvCount_yz,recvbuf_yz,f_even,Nx,Ny,Nz);
-		//...................................................................................
+		// Wait for communications to complete and unpack the distributions
+		ScaLBL_Comm.RecvD3Q19(f_even, f_odd);
+		//*************************************************************************
 
 		DeviceBarrier();
 		MPI_Barrier(MPI_COMM_WORLD);