static void build_linear_system(SOLVER *solver, DOF *u_h, DOF *f_h) { int i, j; GRID *g = u_h->g; ELEMENT *e; assert(u_h->dim == 1); ForAllElements(g, e) { int N = DofGetNBas(u_h, e); /* number of bases in the element */ FLOAT A[N][N], rhs[N], buffer[N]; INT I[N]; /* compute \int \grad\phi_j \cdot \grad\phi_i making use of symmetry */ for (i = 0; i < N; i++) { I[i] = phgSolverMapE2L(solver, 0, e, i); for (j = 0; j <= i; j++) { A[j][i] = A[i][j] = /* stiffness */ phgQuadGradBasDotGradBas(e, u_h, j, u_h, i, QUAD_DEFAULT) + /* mass */ a * phgQuadBasDotBas(e, u_h, j, u_h, i, QUAD_DEFAULT); } } /* loop on basis functions */ for (i = 0; i < N; i++) { if (phgDofDirichletBC(u_h, e, i, func_u, buffer, rhs+i, DOF_PROJ_NONE)) { phgSolverAddMatrixEntries(solver, 1, I + i, N, I, buffer); } else { /* interior node */ /* right hand side = \int f * phi_i */ phgQuadDofTimesBas(e, f_h, u_h, i, QUAD_DEFAULT, rhs + i); phgSolverAddMatrixEntries(solver, 1, I + i, N, I, A[i]); } } phgSolverAddRHSEntries(solver, N, I, rhs); }
static void getMoveDirection(MovingMesh *mmesh) { GRID *g = _m->g; SIMPLEX *e; DOF *logical_move = _m->logical_move; DOF *logical_node = _m->logical_node; DOF *move = _m->move; DOF *logical_node_new, *grad_logical_node; INT i, j, k, l0, l1; SOLVER *solver; DOF *mass_lumping; FLOAT *v_move, *v_mass; FLOAT max_vol = -1e10, min_vol = 1e10; /* Get new monitor */ _m->get_monitor(mmesh); DOF_SCALE(_m->monitor); logical_node_new = phgDofCopy(logical_node, NULL, NULL, "new logical node coordinates"); grad_logical_node = phgDofGradient(logical_node, NULL, NULL, "grad logical node coordinates"); /* if (logical_node_new->DB_mask == UNDEFINED) */ /* phgError(1, "g->types_vert and DB_mask is VAILD in moving mesh method!!!"); */ /* Create move solver */ phgOptionsPush(); #if 0 phgOptionsSetOptions("-default_solver mm_ml " "-mm_ml_solver gmres " "-mm_ml_pc mm_ml " "-mm_ml_sweep0 6 " "-solver_maxit 100 " "-solver_rtol 1e-12 "); #else phgOptionsSetOptions("-default_solver hypre " "-hypre_solver gmres " "-hypre_pc boomeramg " "-solver_maxit 100 " "-solver_rtol 1e-12 "); #endif phgOptionsSetOptions(_mp->move_opts); setMoveConstrain(mmesh, logical_node_new); solver = phgSolverCreate(SOLVER_DEFAULT, logical_node_new, NULL); solver->mat->mv_data = phgAlloc(sizeof(*solver->mat->mv_data)); solver->mat->mv_data[0] = (void *) mmesh; phgOptionsPop(); /* build mat */ ForAllElements(g, e) { int order = 1, q; int N = DofGetNBas(logical_node, e); /* number of bases in the element */ FLOAT A[N][Dim][N][Dim], rhs[N][Dim]; INT I[N][Dim]; QUAD *quad; const FLOAT *w, *lambda; FLOAT vol, mon; vol = phgGeomGetVolume(g, e); max_vol = MAX(max_vol, vol); min_vol = MIN(min_vol, vol); for (i = 0; i < N; i++) for (k = 0; k < Dim; k++) I[i][k] = phgMapE2L(solver->rhs->map, 0, e, i * Dim + k); bzero(A, sizeof(A)); bzero(rhs, sizeof(rhs)); quad = phgQuadGetQuad3D(order); mon = *DofElementData(_m->monitor, e->index); //printf("mon:%e\n", mon); lambda = quad->points; w = quad->weights; assert(quad->npoints == 1); for (q = 0; q < quad->npoints; q++) { for (i = 0; i < N; i++) { for (j = 0; j < N; j++) { const FLOAT *ggi = phgQuadGetBasisGradient(e, _m->move, i, quad) + q*Dim; /* grad phi_i */ const FLOAT *ggj = phgQuadGetBasisGradient(e, _m->move, j, quad) + q*Dim; /* grad phi_j */ FLOAT a = vol*(*w) * mon * INNER_PRODUCT(ggj, ggi); for (k = 0; k < Dim; k++) { A[i][k][j][k] += a; } } } w++; lambda += Dim + 1; } /* end quad point */ for (i = 0; i < N; i++) { INT vert0 = e->verts[i]; if (_mp->fix_bdry || MM_FIXED(g->types_vert[vert0])) { /* no move */ bzero(A[i], sizeof(A[i])); for (k = 0; k < Dim; k++) { A[i][k][i][k] = 1.; rhs[i][k] = logical_node->data[vert0 * Dim + k]; } } else if (g->types_vert[vert0] & MM_CONSTR) { VERT_CONSTRAIN *vert_constr = _m->vert_constr + _m->vert_constr_index[vert0]; FLOAT *trans = vert_constr->Trans; FLOAT *bb = vert_constr->bb; assert(_m->vert_constr_index[vert0] >= 0); assert(vert0 == vert_constr->index); trans_left_ (&A[i][0][0][0], Dim*N, Dim*N, trans); trans_right_(&A[0][0][i][0], Dim*N, Dim*N, trans); if (vert_constr->n_constrain == 2) { bzero(A[i][0], sizeof(A[i][0])); bzero(A[i][1], sizeof(A[i][1])); A[i][0][i][0] = 1.; A[i][1][i][1] = 1.; rhs[i][0] = bb[0]; rhs[i][1] = bb[1]; } else if (vert_constr->n_constrain == 1) { bzero(A[i][0], sizeof(A[i][0])); A[i][0][i][0] = 1.; rhs[i][0] = bb[0]; } else { abort(); } } } for (i = 0; i < N; i++) phgSolverAddMatrixEntries(solver, Dim, &I[i][0], N * Dim, I[0], &A[i][0][0][0]); phgSolverAddRHSEntries(solver, N * Dim, &I[0][0], &rhs[0][0]); }