Add contribution from region multipliers

The multiplier contribution from the getRegionMultiplier is added to the
face multipliers. The getRegionMultiplier method is called with the cell
index on both side of the face in order to return the correct region
multiplier across faults.

opm/autodiff/GeoProps.hpp

@@ -228,9 +228,26 @@ namespace Opm
                     break;
                 }
 
-                // Multiplier contribution on this face
+                // Multiplier contribution on this face for MULT[XYZ] logical cartesian multipliers
                 intersectionTransMult[faceIdx] *=
                     multipliers->getMultiplier(cartesianCellIdx, faceDirection);
+
+                // Multiplier contribution on this fase for region multipliers
+                const int cellIdxInside = grid.face_cells[2*faceIdx];
+                const int cellIdxOutside = grid.face_cells[2*faceIdx + 1];
+
+                // Do not apply region multipliers in the case of boundary connections
+                if (cellIdxInside < 0 || cellIdxOutside < 0) {
+                    continue;
+                }
+                const int cartesianCellIdxInside = grid.global_cell[cellIdxInside];
+                const int cartesianCellIdxOutside = grid.global_cell[cellIdxOutside];
+                //  Only apply the region multipliers from the inside
+                if (cartesianCellIdx == cartesianCellIdxInside) {
+                    intersectionTransMult[faceIdx] *= multipliers->getRegionMultiplier(cartesianCellIdxInside,cartesianCellIdxOutside,faceDirection);
+                }
+
+
             }
         }
     }