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Upwind mobility strategy for computing flux/if-pressures.

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Derive interface pressure values from fluxes rather than the other way
around.

Suggested by: Jostein R. Natvig
This commit is contained in:
Bård Skaflestad 2010-11-15 10:29:23 +01:00
parent fdb1a0f04a
commit 0ffaafc9ee
2 changed files with 46 additions and 24 deletions
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66
src/cfs_tpfa.c
View File

@ -178,14 +178,16 @@ solve_cellsys_core(grid_t *G ,
static void
compute_fpress(grid_t *G,
flowbc_t *bc,
int np,
const double *htrans,
const double *totmob,
const double *pmobf,
const double *cpress,
const double *fflux,
struct cfs_tpfa_data *h)
/* ---------------------------------------------------------------------- */
{
int c, i, f;
double t;
int c, i, f, p;
double t, s;
for (f = 0; f < G->number_of_faces; f++) {
h->pimpl->fpress[f] = 0.0;
@ -196,10 +198,16 @@ compute_fpress(grid_t *G,
for (; i < G->cell_facepos[c + 1]; i++) {
f = G->cell_faces[i];
t = htrans[i] * totmob[c];
t = 0.0;
for (p = 0; p < np; p++) {
t += pmobf[f*np + p];
}
t *= htrans[i];
s = 2.0*(G->face_cells[2*f + 0] == c) - 1.0;
h->pimpl->fpress[f] += t * cpress[c];
h->pimpl->accum [f] += t;
h->pimpl->fpress[f] += cpress[c] - (s * fflux[f] / t);
h->pimpl->accum [f] += 1;
}
}
@ -215,31 +223,41 @@ compute_fpress(grid_t *G,
/* ---------------------------------------------------------------------- */
static void
compute_flux(grid_t *G,
const double *cpress,
const double *htrans,
const double *totmob,
struct cfs_tpfa_data *h,
double *fflux)
compute_flux(grid_t *G,
flowbc_t *bc,
int np,
const double *trans,
const double *pmobf,
const double *cpress,
double *fflux)
/* ---------------------------------------------------------------------- */
{
int f, c1, c2;
int f, c1, c2, p;
double t, dp;
tpfa_eff_trans_compute(G, totmob, htrans, h->pimpl->accum);
for (f = 0; f < G->number_of_faces; f++) {
t = h->pimpl->accum[f];
if (bc->type[f] == FLUX) {
fflux[f] = bc->bcval[f];
continue;
}
t = 0.0;
for (p = 0; p < np; p++) {
t += pmobf[f*np + p];
}
t *= trans[f];
c1 = G->face_cells[2*f + 0];
c2 = G->face_cells[2*f + 1];
if ((c1 >= 0) && (c2 >= 0)) {
dp = cpress[c1] - cpress[c2];
} else if (c1 < 0) {
dp = h->pimpl->fpress[f] - cpress[c2];
} else {
dp = cpress[c1] - h->pimpl->fpress[f];
} else if (bc->type[f] == PRESSURE) {
if (c1 < 0) {
dp = bc->bcval[f] - cpress[c2];
} else {
dp = cpress[c2] - bc->bcval[f];
}
}
fflux[f] = t * dp;
@ -341,8 +359,10 @@ cfs_tpfa_assemble(grid_t *G,
void
cfs_tpfa_press_flux(grid_t *G,
flowbc_t *bc,
int np,
const double *trans,
const double *htrans,
const double *totmob,
const double *pmobf,
struct cfs_tpfa_data *h,
double *cpress,
double *fflux)
@ -351,8 +371,8 @@ cfs_tpfa_press_flux(grid_t *G,
/* Assign cell pressure directly from solution vector */
memcpy(cpress, h->x, G->number_of_cells * sizeof *cpress);
compute_fpress(G, bc, htrans, totmob, cpress, h);
compute_flux (G, cpress, htrans, totmob, h, fflux);
compute_flux (G, bc, np, trans , pmobf, cpress, fflux );
compute_fpress(G, bc, np, htrans, pmobf, cpress, fflux, h);
}

4
src/cfs_tpfa.h
View File

@ -53,8 +53,10 @@ cfs_tpfa_assemble(grid_t *G,
void
cfs_tpfa_press_flux(grid_t *G,
flowbc_t *bc,
int np,
const double *trans,
const double *htrans,
const double *totmob,
const double *pmobf,
struct cfs_tpfa_data *h,
double *cpress,
double *fflux);