1 // Copyright (c) 2017-2022, Lawrence Livermore National Security, LLC and other CEED contributors. 2 // All Rights Reserved. See the top-level LICENSE and NOTICE files for details. 3 // 4 // SPDX-License-Identifier: BSD-2-Clause 5 // 6 // This file is part of CEED: http://github.com/ceed 7 8 /// @file 9 /// Time-stepping functions for Navier-Stokes example using PETSc 10 11 #include <ceed.h> 12 #include <petscdmplex.h> 13 #include <petscts.h> 14 15 #include "../navierstokes.h" 16 #include "../qfunctions/newtonian_state.h" 17 18 // Compute mass matrix for explicit scheme 19 PetscErrorCode ComputeLumpedMassMatrix(Ceed ceed, DM dm, CeedData ceed_data, Vec M) { 20 CeedQFunction qf_mass; 21 CeedOperator op_mass; 22 OperatorApplyContext op_mass_ctx; 23 Vec Ones_loc; 24 CeedInt num_comp_q, q_data_size; 25 PetscFunctionBeginUser; 26 27 // CEED Restriction 28 CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_q, &num_comp_q); 29 CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_qd_i, &q_data_size); 30 31 // CEED QFunction 32 PetscCall(CreateMassQFunction(ceed, num_comp_q, q_data_size, &qf_mass)); 33 34 // CEED Operator 35 CeedOperatorCreate(ceed, qf_mass, NULL, NULL, &op_mass); 36 CeedOperatorSetField(op_mass, "u", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE); 37 CeedOperatorSetField(op_mass, "qdata", ceed_data->elem_restr_qd_i, CEED_BASIS_COLLOCATED, ceed_data->q_data); 38 CeedOperatorSetField(op_mass, "v", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE); 39 40 PetscCall(OperatorApplyContextCreate(NULL, dm, ceed, op_mass, NULL, NULL, NULL, NULL, &op_mass_ctx)); 41 42 PetscCall(DMGetLocalVector(dm, &Ones_loc)); 43 PetscCall(VecSet(Ones_loc, 1)); 44 PetscCall(ApplyCeedOperatorLocalToGlobal(Ones_loc, M, op_mass_ctx)); 45 46 // Invert diagonally lumped mass vector for RHS function 47 PetscCall(VecReciprocal(M)); 48 49 // Cleanup 50 PetscCall(OperatorApplyContextDestroy(op_mass_ctx)); 51 PetscCall(DMRestoreLocalVector(dm, &Ones_loc)); 52 CeedQFunctionDestroy(&qf_mass); 53 CeedOperatorDestroy(&op_mass); 54 55 PetscFunctionReturn(PETSC_SUCCESS); 56 } 57 58 // Insert Boundary values if it's a new time 59 PetscErrorCode UpdateBoundaryValues(User user, Vec Q_loc, PetscReal t) { 60 PetscFunctionBeginUser; 61 if (user->time_bc_set != t) { 62 PetscCall(DMPlexInsertBoundaryValues(user->dm, PETSC_TRUE, Q_loc, t, NULL, NULL, NULL)); 63 user->time_bc_set = t; 64 } 65 PetscFunctionReturn(PETSC_SUCCESS); 66 } 67 68 // @brief Update the context label value to new value if necessary. 69 // @note This only supports labels with scalar label values (ie. not arrays) 70 PetscErrorCode UpdateContextLabel(MPI_Comm comm, PetscScalar update_value, CeedOperator op, CeedContextFieldLabel label) { 71 PetscScalar label_value; 72 73 PetscFunctionBeginUser; 74 PetscCheck(label, comm, PETSC_ERR_ARG_BADPTR, "Label should be non-NULL"); 75 76 { 77 size_t num_elements; 78 const PetscScalar *label_values; 79 CeedOperatorGetContextDoubleRead(op, label, &num_elements, &label_values); 80 PetscCheck(num_elements == 1, comm, PETSC_ERR_SUP, "%s does not support labels with more than 1 value. Label has %zu values", __func__, 81 num_elements); 82 label_value = *label_values; 83 CeedOperatorRestoreContextDoubleRead(op, label, &label_values); 84 } 85 86 if (label_value != update_value) { 87 CeedOperatorSetContextDouble(op, label, &update_value); 88 } 89 PetscFunctionReturn(PETSC_SUCCESS); 90 } 91 92 // RHS (Explicit time-stepper) function setup 93 // This is the RHS of the ODE, given as u_t = G(t,u) 94 // This function takes in a state vector Q and writes into G 95 PetscErrorCode RHS_NS(TS ts, PetscReal t, Vec Q, Vec G, void *user_data) { 96 User user = *(User *)user_data; 97 MPI_Comm comm = PetscObjectComm((PetscObject)ts); 98 PetscScalar dt; 99 Vec Q_loc = user->Q_loc; 100 PetscFunctionBeginUser; 101 102 // Update time dependent data 103 PetscCall(UpdateBoundaryValues(user, Q_loc, t)); 104 if (user->phys->solution_time_label) PetscCall(UpdateContextLabel(comm, t, user->op_rhs_ctx->op, user->phys->solution_time_label)); 105 PetscCall(TSGetTimeStep(ts, &dt)); 106 if (user->phys->timestep_size_label) PetscCall(UpdateContextLabel(comm, dt, user->op_rhs_ctx->op, user->phys->timestep_size_label)); 107 108 PetscCall(ApplyCeedOperatorGlobalToGlobal(Q, G, user->op_rhs_ctx)); 109 110 // Inverse of the lumped mass matrix (M is Minv) 111 PetscCall(VecPointwiseMult(G, G, user->M_inv)); 112 113 PetscFunctionReturn(PETSC_SUCCESS); 114 } 115 116 // Surface forces function setup 117 static PetscErrorCode Surface_Forces_NS(DM dm, Vec G_loc, PetscInt num_walls, const PetscInt walls[], PetscScalar *reaction_force) { 118 DMLabel face_label; 119 const PetscScalar *g; 120 PetscInt dof, dim = 3; 121 MPI_Comm comm; 122 PetscSection s; 123 124 PetscFunctionBeginUser; 125 PetscCall(PetscArrayzero(reaction_force, num_walls * dim)); 126 PetscCall(PetscObjectGetComm((PetscObject)dm, &comm)); 127 PetscCall(DMGetLabel(dm, "Face Sets", &face_label)); 128 PetscCall(VecGetArrayRead(G_loc, &g)); 129 for (PetscInt w = 0; w < num_walls; w++) { 130 const PetscInt wall = walls[w]; 131 IS wall_is; 132 PetscCall(DMGetLocalSection(dm, &s)); 133 PetscCall(DMLabelGetStratumIS(face_label, wall, &wall_is)); 134 if (wall_is) { // There exist such points on this process 135 PetscInt num_points; 136 PetscInt num_comp = 0; 137 const PetscInt *points; 138 PetscCall(PetscSectionGetFieldComponents(s, 0, &num_comp)); 139 PetscCall(ISGetSize(wall_is, &num_points)); 140 PetscCall(ISGetIndices(wall_is, &points)); 141 for (PetscInt i = 0; i < num_points; i++) { 142 const PetscInt p = points[i]; 143 const StateConservative *r; 144 PetscCall(DMPlexPointLocalRead(dm, p, g, &r)); 145 PetscCall(PetscSectionGetDof(s, p, &dof)); 146 for (PetscInt node = 0; node < dof / num_comp; node++) { 147 for (PetscInt j = 0; j < 3; j++) { 148 reaction_force[w * dim + j] -= r[node].momentum[j]; 149 } 150 } 151 } 152 PetscCall(ISRestoreIndices(wall_is, &points)); 153 } 154 PetscCall(ISDestroy(&wall_is)); 155 } 156 PetscCallMPI(MPI_Allreduce(MPI_IN_PLACE, reaction_force, dim * num_walls, MPIU_SCALAR, MPI_SUM, comm)); 157 // Restore Vectors 158 PetscCall(VecRestoreArrayRead(G_loc, &g)); 159 160 PetscFunctionReturn(PETSC_SUCCESS); 161 } 162 163 // Implicit time-stepper function setup 164 PetscErrorCode IFunction_NS(TS ts, PetscReal t, Vec Q, Vec Q_dot, Vec G, void *user_data) { 165 User user = *(User *)user_data; 166 MPI_Comm comm = PetscObjectComm((PetscObject)ts); 167 PetscScalar dt; 168 Vec Q_loc = user->Q_loc, Q_dot_loc = user->Q_dot_loc, G_loc; 169 PetscMemType q_mem_type, q_dot_mem_type, g_mem_type; 170 PetscFunctionBeginUser; 171 172 // Get local vectors 173 PetscCall(DMGetNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 174 175 // Update time dependent data 176 PetscCall(UpdateBoundaryValues(user, Q_loc, t)); 177 if (user->phys->solution_time_label) PetscCall(UpdateContextLabel(comm, t, user->op_ifunction, user->phys->solution_time_label)); 178 PetscCall(TSGetTimeStep(ts, &dt)); 179 if (user->phys->timestep_size_label) PetscCall(UpdateContextLabel(comm, dt, user->op_ifunction, user->phys->timestep_size_label)); 180 181 // Global-to-local 182 PetscCall(DMGlobalToLocalBegin(user->dm, Q, INSERT_VALUES, Q_loc)); 183 PetscCall(DMGlobalToLocalBegin(user->dm, Q_dot, INSERT_VALUES, Q_dot_loc)); 184 PetscCall(DMGlobalToLocalEnd(user->dm, Q, INSERT_VALUES, Q_loc)); 185 PetscCall(DMGlobalToLocalEnd(user->dm, Q_dot, INSERT_VALUES, Q_dot_loc)); 186 187 // Place PETSc vectors in CEED vectors 188 PetscCall(VecReadP2C(Q_loc, &q_mem_type, user->q_ceed)); 189 PetscCall(VecReadP2C(Q_dot_loc, &q_dot_mem_type, user->q_dot_ceed)); 190 PetscCall(VecP2C(G_loc, &g_mem_type, user->g_ceed)); 191 192 // Apply CEED operator 193 PetscCall(PetscLogEventBegin(FLUIDS_CeedOperatorApply, Q, G, 0, 0)); 194 PetscCall(PetscLogGpuTimeBegin()); 195 CeedOperatorApply(user->op_ifunction, user->q_ceed, user->g_ceed, CEED_REQUEST_IMMEDIATE); 196 PetscCall(PetscLogGpuTimeEnd()); 197 PetscCall(PetscLogEventEnd(FLUIDS_CeedOperatorApply, Q, G, 0, 0)); 198 199 // Restore vectors 200 PetscCall(VecReadC2P(user->q_ceed, q_mem_type, Q_loc)); 201 PetscCall(VecReadC2P(user->q_dot_ceed, q_dot_mem_type, Q_dot_loc)); 202 PetscCall(VecC2P(user->g_ceed, g_mem_type, G_loc)); 203 204 if (user->app_ctx->sgs_model_type == SGS_MODEL_DATA_DRIVEN) { 205 PetscCall(SGS_DD_ModelApplyIFunction(user, Q_loc, G_loc)); 206 } 207 208 // Local-to-Global 209 PetscCall(VecZeroEntries(G)); 210 PetscCall(DMLocalToGlobal(user->dm, G_loc, ADD_VALUES, G)); 211 212 // Restore vectors 213 PetscCall(DMRestoreNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 214 215 PetscFunctionReturn(PETSC_SUCCESS); 216 } 217 218 static PetscErrorCode FormPreallocation(User user, PetscBool pbdiagonal, Mat J, CeedVector *coo_values) { 219 PetscCount ncoo; 220 PetscInt *rows, *cols; 221 222 PetscFunctionBeginUser; 223 if (pbdiagonal) { 224 CeedSize l_size; 225 CeedOperatorGetActiveVectorLengths(user->op_ijacobian, &l_size, NULL); 226 ncoo = l_size * 5; 227 rows = malloc(ncoo * sizeof(rows[0])); 228 cols = malloc(ncoo * sizeof(cols[0])); 229 for (PetscCount n = 0; n < l_size / 5; n++) { 230 for (PetscInt i = 0; i < 5; i++) { 231 for (PetscInt j = 0; j < 5; j++) { 232 rows[(n * 5 + i) * 5 + j] = n * 5 + i; 233 cols[(n * 5 + i) * 5 + j] = n * 5 + j; 234 } 235 } 236 } 237 } else { 238 PetscCall(CeedOperatorLinearAssembleSymbolic(user->op_ijacobian, &ncoo, &rows, &cols)); 239 } 240 PetscCall(MatSetPreallocationCOOLocal(J, ncoo, rows, cols)); 241 free(rows); 242 free(cols); 243 CeedVectorCreate(user->ceed, ncoo, coo_values); 244 PetscFunctionReturn(PETSC_SUCCESS); 245 } 246 247 static PetscErrorCode FormSetValues(User user, PetscBool pbdiagonal, Mat J, CeedVector coo_values) { 248 CeedMemType mem_type = CEED_MEM_HOST; 249 const PetscScalar *values; 250 MatType mat_type; 251 252 PetscFunctionBeginUser; 253 PetscCall(MatGetType(J, &mat_type)); 254 if (strstr(mat_type, "kokkos") || strstr(mat_type, "cusparse")) mem_type = CEED_MEM_DEVICE; 255 if (pbdiagonal) { 256 PetscCall(PetscLogEventBegin(FLUIDS_CeedOperatorAssemblePointBlockDiagonal, J, 0, 0, 0)); 257 PetscCall(PetscLogGpuTimeBegin()); 258 CeedOperatorLinearAssemblePointBlockDiagonal(user->op_ijacobian, coo_values, CEED_REQUEST_IMMEDIATE); 259 PetscCall(PetscLogGpuTimeEnd()); 260 PetscCall(PetscLogEventEnd(FLUIDS_CeedOperatorAssemblePointBlockDiagonal, J, 0, 0, 0)); 261 } else { 262 PetscCall(PetscLogEventBegin(FLUIDS_CeedOperatorAssemble, J, 0, 0, 0)); 263 PetscCall(PetscLogGpuTimeBegin()); 264 CeedOperatorLinearAssemble(user->op_ijacobian, coo_values); 265 PetscCall(PetscLogGpuTimeEnd()); 266 PetscCall(PetscLogEventEnd(FLUIDS_CeedOperatorAssemble, J, 0, 0, 0)); 267 } 268 CeedVectorGetArrayRead(coo_values, mem_type, &values); 269 PetscCall(MatSetValuesCOO(J, values, INSERT_VALUES)); 270 CeedVectorRestoreArrayRead(coo_values, &values); 271 PetscFunctionReturn(PETSC_SUCCESS); 272 } 273 274 PetscErrorCode FormIJacobian_NS(TS ts, PetscReal t, Vec Q, Vec Q_dot, PetscReal shift, Mat J, Mat J_pre, void *user_data) { 275 User user = *(User *)user_data; 276 PetscBool J_is_shell, J_is_mffd, J_pre_is_shell; 277 PetscFunctionBeginUser; 278 if (user->phys->ijacobian_time_shift_label) CeedOperatorSetContextDouble(user->op_ijacobian, user->phys->ijacobian_time_shift_label, &shift); 279 PetscCall(PetscObjectTypeCompare((PetscObject)J, MATMFFD, &J_is_mffd)); 280 PetscCall(PetscObjectTypeCompare((PetscObject)J, MATSHELL, &J_is_shell)); 281 PetscCall(PetscObjectTypeCompare((PetscObject)J_pre, MATSHELL, &J_pre_is_shell)); 282 if (!user->matrices_set_up) { 283 if (J_is_shell) { 284 OperatorApplyContext op_ijacobian_ctx; 285 OperatorApplyContextCreate(user->dm, user->dm, user->ceed, user->op_ijacobian, user->q_ceed, user->g_ceed, user->Q_dot_loc, NULL, 286 &op_ijacobian_ctx); 287 PetscCall(MatShellSetContext(J, op_ijacobian_ctx)); 288 PetscCall(MatShellSetContextDestroy(J, (PetscErrorCode(*)(void *))OperatorApplyContextDestroy)); 289 PetscCall(MatShellSetOperation(J, MATOP_MULT, (void (*)(void))MatMult_Ceed)); 290 PetscCall(MatShellSetOperation(J, MATOP_GET_DIAGONAL, (void (*)(void))MatGetDiag_Ceed)); 291 PetscCall(MatSetUp(J)); 292 } 293 if (!J_pre_is_shell) { 294 PetscCall(FormPreallocation(user, user->app_ctx->pmat_pbdiagonal, J_pre, &user->coo_values_pmat)); 295 } 296 if (J != J_pre && !J_is_shell && !J_is_mffd) { 297 PetscCall(FormPreallocation(user, PETSC_FALSE, J, &user->coo_values_amat)); 298 } 299 user->matrices_set_up = true; 300 } 301 if (!J_pre_is_shell) { 302 PetscCall(FormSetValues(user, user->app_ctx->pmat_pbdiagonal, J_pre, user->coo_values_pmat)); 303 } 304 if (user->coo_values_amat) { 305 PetscCall(FormSetValues(user, PETSC_FALSE, J, user->coo_values_amat)); 306 } else if (J_is_mffd) { 307 PetscCall(MatAssemblyBegin(J, MAT_FINAL_ASSEMBLY)); 308 PetscCall(MatAssemblyEnd(J, MAT_FINAL_ASSEMBLY)); 309 } 310 PetscFunctionReturn(PETSC_SUCCESS); 311 } 312 313 PetscErrorCode WriteOutput(User user, Vec Q, PetscInt step_no, PetscScalar time) { 314 Vec Q_loc; 315 char file_path[PETSC_MAX_PATH_LEN]; 316 PetscViewer viewer; 317 PetscFunctionBeginUser; 318 319 if (user->app_ctx->checkpoint_vtk) { 320 // Set up output 321 PetscCall(DMGetLocalVector(user->dm, &Q_loc)); 322 PetscCall(PetscObjectSetName((PetscObject)Q_loc, "StateVec")); 323 PetscCall(VecZeroEntries(Q_loc)); 324 PetscCall(DMGlobalToLocal(user->dm, Q, INSERT_VALUES, Q_loc)); 325 326 // Output 327 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-%03" PetscInt_FMT ".vtu", user->app_ctx->output_dir, step_no)); 328 329 PetscCall(PetscViewerVTKOpen(PetscObjectComm((PetscObject)Q), file_path, FILE_MODE_WRITE, &viewer)); 330 PetscCall(VecView(Q_loc, viewer)); 331 PetscCall(PetscViewerDestroy(&viewer)); 332 if (user->dm_viz) { 333 Vec Q_refined, Q_refined_loc; 334 char file_path_refined[PETSC_MAX_PATH_LEN]; 335 PetscViewer viewer_refined; 336 337 PetscCall(DMGetGlobalVector(user->dm_viz, &Q_refined)); 338 PetscCall(DMGetLocalVector(user->dm_viz, &Q_refined_loc)); 339 PetscCall(PetscObjectSetName((PetscObject)Q_refined_loc, "Refined")); 340 341 PetscCall(MatInterpolate(user->interp_viz, Q, Q_refined)); 342 PetscCall(VecZeroEntries(Q_refined_loc)); 343 PetscCall(DMGlobalToLocal(user->dm_viz, Q_refined, INSERT_VALUES, Q_refined_loc)); 344 345 PetscCall( 346 PetscSNPrintf(file_path_refined, sizeof file_path_refined, "%s/nsrefined-%03" PetscInt_FMT ".vtu", user->app_ctx->output_dir, step_no)); 347 348 PetscCall(PetscViewerVTKOpen(PetscObjectComm((PetscObject)Q_refined), file_path_refined, FILE_MODE_WRITE, &viewer_refined)); 349 PetscCall(VecView(Q_refined_loc, viewer_refined)); 350 PetscCall(DMRestoreLocalVector(user->dm_viz, &Q_refined_loc)); 351 PetscCall(DMRestoreGlobalVector(user->dm_viz, &Q_refined)); 352 PetscCall(PetscViewerDestroy(&viewer_refined)); 353 } 354 PetscCall(DMRestoreLocalVector(user->dm, &Q_loc)); 355 } 356 357 // Save data in a binary file for continuation of simulations 358 if (user->app_ctx->add_stepnum2bin) { 359 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-solution-%" PetscInt_FMT ".bin", user->app_ctx->output_dir, step_no)); 360 } else { 361 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-solution.bin", user->app_ctx->output_dir)); 362 } 363 PetscCall(PetscViewerBinaryOpen(user->comm, file_path, FILE_MODE_WRITE, &viewer)); 364 365 PetscInt token = FLUIDS_FILE_TOKEN; 366 PetscCall(PetscViewerBinaryWrite(viewer, &token, 1, PETSC_INT)); 367 PetscCall(PetscViewerBinaryWrite(viewer, &step_no, 1, PETSC_INT)); 368 time /= user->units->second; // Dimensionalize time back 369 PetscCall(PetscViewerBinaryWrite(viewer, &time, 1, PETSC_REAL)); 370 PetscCall(VecView(Q, viewer)); 371 PetscCall(PetscViewerDestroy(&viewer)); 372 PetscFunctionReturn(PETSC_SUCCESS); 373 } 374 375 // CSV Monitor 376 PetscErrorCode TSMonitor_WallForce(TS ts, PetscInt step_no, PetscReal time, Vec Q, void *ctx) { 377 User user = ctx; 378 Vec G_loc; 379 PetscInt num_wall = user->app_ctx->wall_forces.num_wall, dim = 3; 380 const PetscInt *walls = user->app_ctx->wall_forces.walls; 381 PetscViewer viewer = user->app_ctx->wall_forces.viewer; 382 PetscViewerFormat format = user->app_ctx->wall_forces.viewer_format; 383 PetscScalar *reaction_force; 384 PetscBool iascii; 385 386 PetscFunctionBeginUser; 387 if (!viewer) PetscFunctionReturn(PETSC_SUCCESS); 388 PetscCall(DMGetNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 389 PetscCall(PetscMalloc1(num_wall * dim, &reaction_force)); 390 PetscCall(Surface_Forces_NS(user->dm, G_loc, num_wall, walls, reaction_force)); 391 PetscCall(DMRestoreNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 392 393 PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &iascii)); 394 395 if (iascii) { 396 if (format == PETSC_VIEWER_ASCII_CSV && !user->app_ctx->wall_forces.header_written) { 397 PetscCall(PetscViewerASCIIPrintf(viewer, "Step,Time,Wall,ForceX,ForceY,ForceZ\n")); 398 user->app_ctx->wall_forces.header_written = PETSC_TRUE; 399 } 400 for (PetscInt w = 0; w < num_wall; w++) { 401 PetscInt wall = walls[w]; 402 if (format == PETSC_VIEWER_ASCII_CSV) { 403 PetscCall(PetscViewerASCIIPrintf(viewer, "%" PetscInt_FMT ",%g,%" PetscInt_FMT ",%g,%g,%g\n", step_no, time, wall, 404 reaction_force[w * dim + 0], reaction_force[w * dim + 1], reaction_force[w * dim + 2])); 405 406 } else { 407 PetscCall(PetscViewerASCIIPrintf(viewer, "Wall %" PetscInt_FMT " Forces: Force_x = %12g, Force_y = %12g, Force_z = %12g\n", wall, 408 reaction_force[w * dim + 0], reaction_force[w * dim + 1], reaction_force[w * dim + 2])); 409 } 410 } 411 } 412 PetscCall(PetscFree(reaction_force)); 413 PetscFunctionReturn(PETSC_SUCCESS); 414 } 415 416 // User provided TS Monitor 417 PetscErrorCode TSMonitor_NS(TS ts, PetscInt step_no, PetscReal time, Vec Q, void *ctx) { 418 User user = ctx; 419 PetscFunctionBeginUser; 420 421 // Print every 'checkpoint_interval' steps 422 if (user->app_ctx->checkpoint_interval <= 0 || step_no % user->app_ctx->checkpoint_interval != 0 || 423 (user->app_ctx->cont_steps == step_no && step_no != 0)) { 424 PetscFunctionReturn(PETSC_SUCCESS); 425 } 426 427 PetscCall(WriteOutput(user, Q, step_no, time)); 428 429 PetscFunctionReturn(PETSC_SUCCESS); 430 } 431 432 // TS: Create, setup, and solve 433 PetscErrorCode TSSolve_NS(DM dm, User user, AppCtx app_ctx, Physics phys, Vec *Q, PetscScalar *f_time, TS *ts) { 434 MPI_Comm comm = user->comm; 435 TSAdapt adapt; 436 PetscScalar final_time; 437 PetscFunctionBeginUser; 438 439 PetscCall(TSCreate(comm, ts)); 440 PetscCall(TSSetDM(*ts, dm)); 441 if (phys->implicit) { 442 PetscCall(TSSetType(*ts, TSBDF)); 443 if (user->op_ifunction) { 444 PetscCall(TSSetIFunction(*ts, NULL, IFunction_NS, &user)); 445 } else { // Implicit integrators can fall back to using an RHSFunction 446 PetscCall(TSSetRHSFunction(*ts, NULL, RHS_NS, &user)); 447 } 448 if (user->op_ijacobian) { 449 PetscCall(DMTSSetIJacobian(dm, FormIJacobian_NS, &user)); 450 if (app_ctx->amat_type) { 451 Mat Pmat, Amat; 452 PetscCall(DMCreateMatrix(dm, &Pmat)); 453 PetscCall(DMSetMatType(dm, app_ctx->amat_type)); 454 PetscCall(DMCreateMatrix(dm, &Amat)); 455 PetscCall(TSSetIJacobian(*ts, Amat, Pmat, NULL, NULL)); 456 PetscCall(MatDestroy(&Amat)); 457 PetscCall(MatDestroy(&Pmat)); 458 } 459 } 460 } else { 461 PetscCheck(user->op_rhs_ctx, comm, PETSC_ERR_ARG_NULL, "Problem does not provide RHSFunction"); 462 PetscCall(TSSetType(*ts, TSRK)); 463 PetscCall(TSRKSetType(*ts, TSRK5F)); 464 PetscCall(TSSetRHSFunction(*ts, NULL, RHS_NS, &user)); 465 } 466 PetscCall(TSSetMaxTime(*ts, 500. * user->units->second)); 467 PetscCall(TSSetExactFinalTime(*ts, TS_EXACTFINALTIME_STEPOVER)); 468 if (app_ctx->test_type == TESTTYPE_NONE) PetscCall(TSSetErrorIfStepFails(*ts, PETSC_FALSE)); 469 PetscCall(TSSetTimeStep(*ts, 1.e-2 * user->units->second)); 470 if (app_ctx->test_type != TESTTYPE_NONE) { 471 PetscCall(TSSetMaxSteps(*ts, 10)); 472 } 473 PetscCall(TSGetAdapt(*ts, &adapt)); 474 PetscCall(TSAdaptSetStepLimits(adapt, 1.e-12 * user->units->second, 1.e2 * user->units->second)); 475 PetscCall(TSSetFromOptions(*ts)); 476 user->time_bc_set = -1.0; // require all BCs be updated 477 if (app_ctx->cont_steps) { // continue from previous timestep data 478 PetscInt count; 479 PetscViewer viewer; 480 481 if (app_ctx->cont_time <= 0) { // Legacy files did not include step number and time 482 PetscCall(PetscViewerBinaryOpen(comm, app_ctx->cont_time_file, FILE_MODE_READ, &viewer)); 483 PetscCall(PetscViewerBinaryRead(viewer, &app_ctx->cont_time, 1, &count, PETSC_REAL)); 484 PetscCall(PetscViewerDestroy(&viewer)); 485 PetscCheck(app_ctx->cont_steps != -1, comm, PETSC_ERR_ARG_INCOMP, 486 "-continue step number not specified, but checkpoint file does not contain a step number (likely written by older code version)"); 487 } 488 PetscCall(TSSetTime(*ts, app_ctx->cont_time * user->units->second)); 489 PetscCall(TSSetStepNumber(*ts, app_ctx->cont_steps)); 490 } 491 if (app_ctx->test_type == TESTTYPE_NONE) { 492 PetscCall(TSMonitorSet(*ts, TSMonitor_NS, user, NULL)); 493 } 494 if (app_ctx->wall_forces.viewer) { 495 PetscCall(TSMonitorSet(*ts, TSMonitor_WallForce, user, NULL)); 496 } 497 if (app_ctx->turb_spanstats_enable) { 498 PetscCall(TSMonitorSet(*ts, TSMonitor_TurbulenceStatistics, user, NULL)); 499 CeedScalar previous_time = app_ctx->cont_time * user->units->second; 500 CeedOperatorSetContextDouble(user->spanstats.op_stats_collect_ctx->op, user->spanstats.previous_time_label, &previous_time); 501 } 502 if (app_ctx->diff_filter_monitor) PetscCall(TSMonitorSet(*ts, TSMonitor_DifferentialFilter, user, NULL)); 503 504 // Solve 505 PetscReal start_time; 506 PetscInt start_step; 507 PetscCall(TSGetTime(*ts, &start_time)); 508 PetscCall(TSGetStepNumber(*ts, &start_step)); 509 510 PetscPreLoadBegin(PETSC_FALSE, "Fluids Solve"); 511 PetscCall(TSSetTime(*ts, start_time)); 512 PetscCall(TSSetStepNumber(*ts, start_step)); 513 if (PetscPreLoadingOn) { 514 // LCOV_EXCL_START 515 SNES snes; 516 Vec Q_preload; 517 PetscReal rtol; 518 PetscCall(VecDuplicate(*Q, &Q_preload)); 519 PetscCall(VecCopy(*Q, Q_preload)); 520 PetscCall(TSGetSNES(*ts, &snes)); 521 PetscCall(SNESGetTolerances(snes, NULL, &rtol, NULL, NULL, NULL)); 522 PetscCall(SNESSetTolerances(snes, PETSC_DEFAULT, .99, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT)); 523 PetscCall(TSSetSolution(*ts, *Q)); 524 PetscCall(TSStep(*ts)); 525 PetscCall(SNESSetTolerances(snes, PETSC_DEFAULT, rtol, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT)); 526 PetscCall(VecDestroy(&Q_preload)); 527 // LCOV_EXCL_STOP 528 } else { 529 PetscCall(PetscBarrier((PetscObject)*ts)); 530 PetscCall(TSSolve(*ts, *Q)); 531 } 532 PetscPreLoadEnd(); 533 534 PetscCall(TSGetSolveTime(*ts, &final_time)); 535 *f_time = final_time; 536 537 if (app_ctx->test_type == TESTTYPE_NONE) { 538 PetscInt step_no; 539 PetscCall(TSGetStepNumber(*ts, &step_no)); 540 if (user->app_ctx->checkpoint_interval > 0 || user->app_ctx->checkpoint_interval == -1) { 541 PetscCall(WriteOutput(user, *Q, step_no, final_time)); 542 } 543 544 PetscLogStage stage_id; 545 PetscStageLog stage_log; 546 547 PetscCall(PetscLogStageGetId("Fluids Solve", &stage_id)); 548 PetscCall(PetscLogGetStageLog(&stage_log)); 549 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Time taken for solution (sec): %g\n", stage_log->stageInfo[stage_id].perfInfo.time)); 550 } 551 PetscFunctionReturn(PETSC_SUCCESS); 552 } 553