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 // @brief Create KSP to solve the inverse mass operator for explicit time stepping schemes 19 PetscErrorCode CreateKspMassOperator(User user, CeedData ceed_data) { 20 Ceed ceed = user->ceed; 21 DM dm = user->dm; 22 CeedQFunction qf_mass; 23 CeedOperator op_mass; 24 OperatorApplyContext mass_matop_ctx; 25 CeedInt num_comp_q, q_data_size; 26 27 PetscFunctionBeginUser; 28 PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_q, &num_comp_q)); 29 PetscCallCeed(ceed, CeedElemRestrictionGetNumComponents(ceed_data->elem_restr_qd_i, &q_data_size)); 30 31 PetscCall(CreateMassQFunction(ceed, num_comp_q, q_data_size, &qf_mass)); 32 PetscCallCeed(ceed, CeedOperatorCreate(ceed, qf_mass, NULL, NULL, &op_mass)); 33 PetscCallCeed(ceed, CeedOperatorSetField(op_mass, "u", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE)); 34 PetscCallCeed(ceed, CeedOperatorSetField(op_mass, "qdata", ceed_data->elem_restr_qd_i, CEED_BASIS_NONE, ceed_data->q_data)); 35 PetscCallCeed(ceed, CeedOperatorSetField(op_mass, "v", ceed_data->elem_restr_q, ceed_data->basis_q, CEED_VECTOR_ACTIVE)); 36 37 { // -- Setup KSP for mass operator 38 Mat mat_mass; 39 Vec Ones_loc; 40 MPI_Comm comm = PetscObjectComm((PetscObject)dm); 41 42 PetscCall(DMCreateLocalVector(dm, &Ones_loc)); 43 PetscCall(VecSet(Ones_loc, 1)); 44 PetscCall(OperatorApplyContextCreate(dm, dm, ceed, op_mass, NULL, NULL, Ones_loc, NULL, &mass_matop_ctx)); 45 PetscCall(CreateMatShell_Ceed(mass_matop_ctx, &mat_mass)); 46 47 PetscCall(KSPCreate(comm, &user->mass_ksp)); 48 PetscCall(KSPSetOptionsPrefix(user->mass_ksp, "mass_")); 49 { // lumped by default 50 PC pc; 51 PetscCall(KSPGetPC(user->mass_ksp, &pc)); 52 PetscCall(PCSetType(pc, PCJACOBI)); 53 PetscCall(PCJacobiSetType(pc, PC_JACOBI_ROWSUM)); 54 PetscCall(KSPSetType(user->mass_ksp, KSPPREONLY)); 55 } 56 PetscCall(KSPSetOperators(user->mass_ksp, mat_mass, mat_mass)); 57 PetscCall(KSPSetFromOptions(user->mass_ksp)); 58 PetscCall(VecDestroy(&Ones_loc)); 59 } 60 61 // Cleanup 62 PetscCallCeed(ceed, CeedQFunctionDestroy(&qf_mass)); 63 PetscCallCeed(ceed, CeedOperatorDestroy(&op_mass)); 64 PetscFunctionReturn(PETSC_SUCCESS); 65 } 66 67 // Insert Boundary values if it's a new time 68 PetscErrorCode UpdateBoundaryValues(User user, Vec Q_loc, PetscReal t) { 69 PetscFunctionBeginUser; 70 if (user->time_bc_set != t) { 71 PetscCall(DMPlexInsertBoundaryValues(user->dm, PETSC_TRUE, Q_loc, t, NULL, NULL, NULL)); 72 user->time_bc_set = t; 73 } 74 PetscFunctionReturn(PETSC_SUCCESS); 75 } 76 77 // RHS (Explicit time-stepper) function setup 78 // This is the RHS of the ODE, given as u_t = G(t,u) 79 // This function takes in a state vector Q and writes into G 80 PetscErrorCode RHS_NS(TS ts, PetscReal t, Vec Q, Vec G, void *user_data) { 81 User user = *(User *)user_data; 82 Ceed ceed = user->ceed; 83 PetscScalar dt; 84 Vec Q_loc = user->Q_loc; 85 86 PetscFunctionBeginUser; 87 // Update time dependent data 88 PetscCall(UpdateBoundaryValues(user, Q_loc, t)); 89 if (user->phys->solution_time_label) PetscCallCeed(ceed, CeedOperatorSetContextDouble(user->op_rhs_ctx->op, user->phys->solution_time_label, &t)); 90 PetscCall(TSGetTimeStep(ts, &dt)); 91 if (user->phys->timestep_size_label) PetscCallCeed(ceed, CeedOperatorSetContextDouble(user->op_rhs_ctx->op, user->phys->timestep_size_label, &dt)); 92 93 PetscCall(ApplyCeedOperatorGlobalToGlobal(Q, G, user->op_rhs_ctx)); 94 95 // Inverse of the lumped mass matrix 96 PetscCall(KSPSolve(user->mass_ksp, G, G)); 97 PetscFunctionReturn(PETSC_SUCCESS); 98 } 99 100 // Surface forces function setup 101 static PetscErrorCode Surface_Forces_NS(DM dm, Vec G_loc, PetscInt num_walls, const PetscInt walls[], PetscScalar *reaction_force) { 102 DMLabel face_label; 103 const PetscScalar *g; 104 PetscInt dof, dim = 3; 105 MPI_Comm comm; 106 PetscSection s; 107 108 PetscFunctionBeginUser; 109 PetscCall(PetscArrayzero(reaction_force, num_walls * dim)); 110 PetscCall(PetscObjectGetComm((PetscObject)dm, &comm)); 111 PetscCall(DMGetLabel(dm, "Face Sets", &face_label)); 112 PetscCall(VecGetArrayRead(G_loc, &g)); 113 for (PetscInt w = 0; w < num_walls; w++) { 114 const PetscInt wall = walls[w]; 115 IS wall_is; 116 PetscCall(DMGetLocalSection(dm, &s)); 117 PetscCall(DMLabelGetStratumIS(face_label, wall, &wall_is)); 118 if (wall_is) { // There exist such points on this process 119 PetscInt num_points; 120 PetscInt num_comp = 0; 121 const PetscInt *points; 122 PetscCall(PetscSectionGetFieldComponents(s, 0, &num_comp)); 123 PetscCall(ISGetSize(wall_is, &num_points)); 124 PetscCall(ISGetIndices(wall_is, &points)); 125 for (PetscInt i = 0; i < num_points; i++) { 126 const PetscInt p = points[i]; 127 const StateConservative *r; 128 PetscCall(DMPlexPointLocalRead(dm, p, g, &r)); 129 PetscCall(PetscSectionGetDof(s, p, &dof)); 130 for (PetscInt node = 0; node < dof / num_comp; node++) { 131 for (PetscInt j = 0; j < 3; j++) { 132 reaction_force[w * dim + j] -= r[node].momentum[j]; 133 } 134 } 135 } 136 PetscCall(ISRestoreIndices(wall_is, &points)); 137 } 138 PetscCall(ISDestroy(&wall_is)); 139 } 140 PetscCallMPI(MPI_Allreduce(MPI_IN_PLACE, reaction_force, dim * num_walls, MPIU_SCALAR, MPI_SUM, comm)); 141 // Restore Vectors 142 PetscCall(VecRestoreArrayRead(G_loc, &g)); 143 PetscFunctionReturn(PETSC_SUCCESS); 144 } 145 146 // Implicit time-stepper function setup 147 PetscErrorCode IFunction_NS(TS ts, PetscReal t, Vec Q, Vec Q_dot, Vec G, void *user_data) { 148 User user = *(User *)user_data; 149 Ceed ceed = user->ceed; 150 PetscScalar dt; 151 Vec Q_loc = user->Q_loc, Q_dot_loc = user->Q_dot_loc, G_loc; 152 PetscMemType q_mem_type, q_dot_mem_type, g_mem_type; 153 154 PetscFunctionBeginUser; 155 // Get local vectors 156 PetscCall(DMGetNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 157 158 // Update time dependent data 159 PetscCall(UpdateBoundaryValues(user, Q_loc, t)); 160 if (user->phys->solution_time_label) PetscCallCeed(ceed, CeedOperatorSetContextDouble(user->op_ifunction, user->phys->solution_time_label, &t)); 161 PetscCall(TSGetTimeStep(ts, &dt)); 162 if (user->phys->timestep_size_label) PetscCallCeed(ceed, CeedOperatorSetContextDouble(user->op_ifunction, user->phys->timestep_size_label, &dt)); 163 164 // Global-to-local 165 PetscCall(DMGlobalToLocalBegin(user->dm, Q, INSERT_VALUES, Q_loc)); 166 PetscCall(DMGlobalToLocalBegin(user->dm, Q_dot, INSERT_VALUES, Q_dot_loc)); 167 PetscCall(DMGlobalToLocalEnd(user->dm, Q, INSERT_VALUES, Q_loc)); 168 PetscCall(DMGlobalToLocalEnd(user->dm, Q_dot, INSERT_VALUES, Q_dot_loc)); 169 170 // Place PETSc vectors in CEED vectors 171 PetscCall(VecReadP2C(Q_loc, &q_mem_type, user->q_ceed)); 172 PetscCall(VecReadP2C(Q_dot_loc, &q_dot_mem_type, user->q_dot_ceed)); 173 PetscCall(VecP2C(G_loc, &g_mem_type, user->g_ceed)); 174 175 // Apply CEED operator 176 PetscCall(PetscLogEventBegin(FLUIDS_CeedOperatorApply, Q, G, 0, 0)); 177 PetscCall(PetscLogGpuTimeBegin()); 178 PetscCallCeed(user->ceed, CeedOperatorApply(user->op_ifunction, user->q_ceed, user->g_ceed, CEED_REQUEST_IMMEDIATE)); 179 PetscCall(PetscLogGpuTimeEnd()); 180 PetscCall(PetscLogEventEnd(FLUIDS_CeedOperatorApply, Q, G, 0, 0)); 181 182 // Restore vectors 183 PetscCall(VecReadC2P(user->q_ceed, q_mem_type, Q_loc)); 184 PetscCall(VecReadC2P(user->q_dot_ceed, q_dot_mem_type, Q_dot_loc)); 185 PetscCall(VecC2P(user->g_ceed, g_mem_type, G_loc)); 186 187 if (user->app_ctx->sgs_model_type == SGS_MODEL_DATA_DRIVEN) { 188 PetscCall(SgsDDModelApplyIFunction(user, Q_loc, G_loc)); 189 } 190 191 // Local-to-Global 192 PetscCall(VecZeroEntries(G)); 193 PetscCall(DMLocalToGlobal(user->dm, G_loc, ADD_VALUES, G)); 194 195 // Restore vectors 196 PetscCall(DMRestoreNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 197 PetscFunctionReturn(PETSC_SUCCESS); 198 } 199 200 static PetscErrorCode FormPreallocation(User user, PetscBool pbdiagonal, Mat J, CeedVector *coo_values) { 201 PetscCount ncoo; 202 PetscInt *rows_petsc, *cols_petsc; 203 CeedInt *rows_ceed, *cols_ceed; 204 205 PetscFunctionBeginUser; 206 if (pbdiagonal) { 207 PetscCallCeed(user->ceed, CeedOperatorLinearAssemblePointBlockDiagonalSymbolic(user->op_ijacobian, &ncoo, &rows_ceed, &cols_ceed)); 208 } else { 209 PetscCallCeed(user->ceed, CeedOperatorLinearAssembleSymbolic(user->op_ijacobian, &ncoo, &rows_ceed, &cols_ceed)); 210 } 211 PetscCall(IntArrayC2P(ncoo, &rows_ceed, &rows_petsc)); 212 PetscCall(IntArrayC2P(ncoo, &cols_ceed, &cols_petsc)); 213 PetscCall(MatSetPreallocationCOOLocal(J, ncoo, rows_petsc, cols_petsc)); 214 free(rows_petsc); 215 free(cols_petsc); 216 PetscCallCeed(user->ceed, CeedVectorCreate(user->ceed, ncoo, coo_values)); 217 PetscFunctionReturn(PETSC_SUCCESS); 218 } 219 220 static PetscErrorCode FormSetValues(User user, PetscBool pbdiagonal, Mat J, CeedVector coo_values) { 221 CeedMemType mem_type = CEED_MEM_HOST; 222 const PetscScalar *values; 223 MatType mat_type; 224 225 PetscFunctionBeginUser; 226 PetscCall(MatGetType(J, &mat_type)); 227 if (strstr(mat_type, "kokkos") || strstr(mat_type, "cusparse")) mem_type = CEED_MEM_DEVICE; 228 if (pbdiagonal) { 229 PetscCall(PetscLogEventBegin(FLUIDS_CeedOperatorAssemblePointBlockDiagonal, J, 0, 0, 0)); 230 PetscCall(PetscLogGpuTimeBegin()); 231 PetscCallCeed(user->ceed, CeedOperatorLinearAssemblePointBlockDiagonal(user->op_ijacobian, coo_values, CEED_REQUEST_IMMEDIATE)); 232 PetscCall(PetscLogGpuTimeEnd()); 233 PetscCall(PetscLogEventEnd(FLUIDS_CeedOperatorAssemblePointBlockDiagonal, J, 0, 0, 0)); 234 } else { 235 PetscCall(PetscLogEventBegin(FLUIDS_CeedOperatorAssemble, J, 0, 0, 0)); 236 PetscCall(PetscLogGpuTimeBegin()); 237 PetscCallCeed(user->ceed, CeedOperatorLinearAssemble(user->op_ijacobian, coo_values)); 238 PetscCall(PetscLogGpuTimeEnd()); 239 PetscCall(PetscLogEventEnd(FLUIDS_CeedOperatorAssemble, J, 0, 0, 0)); 240 } 241 PetscCallCeed(user->ceed, CeedVectorGetArrayRead(coo_values, mem_type, &values)); 242 PetscCall(MatSetValuesCOO(J, values, INSERT_VALUES)); 243 PetscCallCeed(user->ceed, CeedVectorRestoreArrayRead(coo_values, &values)); 244 PetscFunctionReturn(PETSC_SUCCESS); 245 } 246 247 PetscErrorCode FormIJacobian_NS(TS ts, PetscReal t, Vec Q, Vec Q_dot, PetscReal shift, Mat J, Mat J_pre, void *user_data) { 248 User user = *(User *)user_data; 249 Ceed ceed = user->ceed; 250 PetscBool J_is_shell, J_is_mffd, J_pre_is_shell; 251 252 PetscFunctionBeginUser; 253 if (user->phys->ijacobian_time_shift_label) 254 PetscCallCeed(ceed, CeedOperatorSetContextDouble(user->op_ijacobian, user->phys->ijacobian_time_shift_label, &shift)); 255 PetscCall(PetscObjectTypeCompare((PetscObject)J, MATMFFD, &J_is_mffd)); 256 PetscCall(PetscObjectTypeCompare((PetscObject)J, MATSHELL, &J_is_shell)); 257 PetscCall(PetscObjectTypeCompare((PetscObject)J_pre, MATSHELL, &J_pre_is_shell)); 258 if (!user->matrices_set_up) { 259 if (J_is_shell) { 260 OperatorApplyContext op_ijacobian_ctx; 261 OperatorApplyContextCreate(user->dm, user->dm, user->ceed, user->op_ijacobian, user->q_ceed, user->g_ceed, user->Q_dot_loc, NULL, 262 &op_ijacobian_ctx); 263 PetscCall(MatShellSetContext(J, op_ijacobian_ctx)); 264 PetscCall(MatShellSetContextDestroy(J, (PetscErrorCode(*)(void *))OperatorApplyContextDestroy)); 265 PetscCall(MatShellSetOperation(J, MATOP_MULT, (void (*)(void))MatMult_Ceed)); 266 PetscCall(MatShellSetOperation(J, MATOP_GET_DIAGONAL, (void (*)(void))MatGetDiag_Ceed)); 267 PetscCall(MatSetUp(J)); 268 } 269 if (!J_pre_is_shell) { 270 PetscCall(FormPreallocation(user, user->app_ctx->pmat_pbdiagonal, J_pre, &user->coo_values_pmat)); 271 } 272 if (J != J_pre && !J_is_shell && !J_is_mffd) { 273 PetscCall(FormPreallocation(user, PETSC_FALSE, J, &user->coo_values_amat)); 274 } 275 user->matrices_set_up = true; 276 } 277 if (!J_pre_is_shell) { 278 PetscCall(FormSetValues(user, user->app_ctx->pmat_pbdiagonal, J_pre, user->coo_values_pmat)); 279 } 280 if (user->coo_values_amat) { 281 PetscCall(FormSetValues(user, PETSC_FALSE, J, user->coo_values_amat)); 282 } else if (J_is_mffd) { 283 PetscCall(MatAssemblyBegin(J, MAT_FINAL_ASSEMBLY)); 284 PetscCall(MatAssemblyEnd(J, MAT_FINAL_ASSEMBLY)); 285 } 286 PetscFunctionReturn(PETSC_SUCCESS); 287 } 288 289 PetscErrorCode WriteOutput(User user, Vec Q, PetscInt step_no, PetscScalar time) { 290 Vec Q_loc; 291 char file_path[PETSC_MAX_PATH_LEN]; 292 PetscViewer viewer; 293 294 PetscFunctionBeginUser; 295 if (user->app_ctx->checkpoint_vtk) { 296 // Set up output 297 PetscCall(DMGetLocalVector(user->dm, &Q_loc)); 298 PetscCall(PetscObjectSetName((PetscObject)Q_loc, "StateVec")); 299 PetscCall(VecZeroEntries(Q_loc)); 300 PetscCall(DMGlobalToLocal(user->dm, Q, INSERT_VALUES, Q_loc)); 301 302 // Output 303 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-%03" PetscInt_FMT ".vtu", user->app_ctx->output_dir, step_no)); 304 305 PetscCall(PetscViewerVTKOpen(PetscObjectComm((PetscObject)Q), file_path, FILE_MODE_WRITE, &viewer)); 306 PetscCall(VecView(Q_loc, viewer)); 307 PetscCall(PetscViewerDestroy(&viewer)); 308 if (user->dm_viz) { 309 Vec Q_refined, Q_refined_loc; 310 char file_path_refined[PETSC_MAX_PATH_LEN]; 311 PetscViewer viewer_refined; 312 313 PetscCall(DMGetGlobalVector(user->dm_viz, &Q_refined)); 314 PetscCall(DMGetLocalVector(user->dm_viz, &Q_refined_loc)); 315 PetscCall(PetscObjectSetName((PetscObject)Q_refined_loc, "Refined")); 316 317 PetscCall(MatInterpolate(user->interp_viz, Q, Q_refined)); 318 PetscCall(VecZeroEntries(Q_refined_loc)); 319 PetscCall(DMGlobalToLocal(user->dm_viz, Q_refined, INSERT_VALUES, Q_refined_loc)); 320 321 PetscCall( 322 PetscSNPrintf(file_path_refined, sizeof file_path_refined, "%s/nsrefined-%03" PetscInt_FMT ".vtu", user->app_ctx->output_dir, step_no)); 323 324 PetscCall(PetscViewerVTKOpen(PetscObjectComm((PetscObject)Q_refined), file_path_refined, FILE_MODE_WRITE, &viewer_refined)); 325 PetscCall(VecView(Q_refined_loc, viewer_refined)); 326 PetscCall(DMRestoreLocalVector(user->dm_viz, &Q_refined_loc)); 327 PetscCall(DMRestoreGlobalVector(user->dm_viz, &Q_refined)); 328 PetscCall(PetscViewerDestroy(&viewer_refined)); 329 } 330 PetscCall(DMRestoreLocalVector(user->dm, &Q_loc)); 331 } 332 333 // Save data in a binary file for continuation of simulations 334 if (user->app_ctx->add_stepnum2bin) { 335 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-solution-%" PetscInt_FMT ".bin", user->app_ctx->output_dir, step_no)); 336 } else { 337 PetscCall(PetscSNPrintf(file_path, sizeof file_path, "%s/ns-solution.bin", user->app_ctx->output_dir)); 338 } 339 PetscCall(PetscViewerBinaryOpen(user->comm, file_path, FILE_MODE_WRITE, &viewer)); 340 341 PetscInt32 token = PetscDefined(USE_64BIT_INDICES) ? FLUIDS_FILE_TOKEN_64 : FLUIDS_FILE_TOKEN_32; 342 PetscCall(PetscViewerBinaryWrite(viewer, &token, 1, PETSC_INT32)); 343 PetscCall(PetscViewerBinaryWrite(viewer, &step_no, 1, PETSC_INT)); 344 time /= user->units->second; // Dimensionalize time back 345 PetscCall(PetscViewerBinaryWrite(viewer, &time, 1, PETSC_REAL)); 346 PetscCall(VecView(Q, viewer)); 347 PetscCall(PetscViewerDestroy(&viewer)); 348 PetscFunctionReturn(PETSC_SUCCESS); 349 } 350 351 // CSV Monitor 352 PetscErrorCode TSMonitor_WallForce(TS ts, PetscInt step_no, PetscReal time, Vec Q, void *ctx) { 353 User user = ctx; 354 Vec G_loc; 355 PetscInt num_wall = user->app_ctx->wall_forces.num_wall, dim = 3; 356 const PetscInt *walls = user->app_ctx->wall_forces.walls; 357 PetscViewer viewer = user->app_ctx->wall_forces.viewer; 358 PetscViewerFormat format = user->app_ctx->wall_forces.viewer_format; 359 PetscScalar *reaction_force; 360 PetscBool iascii; 361 362 PetscFunctionBeginUser; 363 if (!viewer) PetscFunctionReturn(PETSC_SUCCESS); 364 PetscCall(DMGetNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 365 PetscCall(PetscMalloc1(num_wall * dim, &reaction_force)); 366 PetscCall(Surface_Forces_NS(user->dm, G_loc, num_wall, walls, reaction_force)); 367 PetscCall(DMRestoreNamedLocalVector(user->dm, "ResidualLocal", &G_loc)); 368 369 PetscCall(PetscObjectTypeCompare((PetscObject)viewer, PETSCVIEWERASCII, &iascii)); 370 371 if (iascii) { 372 if (format == PETSC_VIEWER_ASCII_CSV && !user->app_ctx->wall_forces.header_written) { 373 PetscCall(PetscViewerASCIIPrintf(viewer, "Step,Time,Wall,ForceX,ForceY,ForceZ\n")); 374 user->app_ctx->wall_forces.header_written = PETSC_TRUE; 375 } 376 for (PetscInt w = 0; w < num_wall; w++) { 377 PetscInt wall = walls[w]; 378 if (format == PETSC_VIEWER_ASCII_CSV) { 379 PetscCall(PetscViewerASCIIPrintf(viewer, "%" PetscInt_FMT ",%g,%" PetscInt_FMT ",%g,%g,%g\n", step_no, time, wall, 380 reaction_force[w * dim + 0], reaction_force[w * dim + 1], reaction_force[w * dim + 2])); 381 382 } else { 383 PetscCall(PetscViewerASCIIPrintf(viewer, "Wall %" PetscInt_FMT " Forces: Force_x = %12g, Force_y = %12g, Force_z = %12g\n", wall, 384 reaction_force[w * dim + 0], reaction_force[w * dim + 1], reaction_force[w * dim + 2])); 385 } 386 } 387 } 388 PetscCall(PetscFree(reaction_force)); 389 PetscFunctionReturn(PETSC_SUCCESS); 390 } 391 392 // User provided TS Monitor 393 PetscErrorCode TSMonitor_NS(TS ts, PetscInt step_no, PetscReal time, Vec Q, void *ctx) { 394 User user = ctx; 395 396 PetscFunctionBeginUser; 397 // Print every 'checkpoint_interval' steps 398 if (user->app_ctx->checkpoint_interval <= 0 || step_no % user->app_ctx->checkpoint_interval != 0 || 399 (user->app_ctx->cont_steps == step_no && step_no != 0)) { 400 PetscFunctionReturn(PETSC_SUCCESS); 401 } 402 403 PetscCall(WriteOutput(user, Q, step_no, time)); 404 PetscFunctionReturn(PETSC_SUCCESS); 405 } 406 407 // TS: Create, setup, and solve 408 PetscErrorCode TSSolve_NS(DM dm, User user, AppCtx app_ctx, Physics phys, Vec *Q, PetscScalar *f_time, TS *ts) { 409 MPI_Comm comm = user->comm; 410 TSAdapt adapt; 411 PetscScalar final_time; 412 413 PetscFunctionBeginUser; 414 PetscCall(TSCreate(comm, ts)); 415 PetscCall(TSSetDM(*ts, dm)); 416 PetscCall(TSSetApplicationContext(*ts, user)); 417 if (phys->implicit) { 418 PetscCall(TSSetType(*ts, TSBDF)); 419 if (user->op_ifunction) { 420 PetscCall(TSSetIFunction(*ts, NULL, IFunction_NS, &user)); 421 } else { // Implicit integrators can fall back to using an RHSFunction 422 PetscCall(TSSetRHSFunction(*ts, NULL, RHS_NS, &user)); 423 } 424 if (user->op_ijacobian) { 425 PetscCall(DMTSSetIJacobian(dm, FormIJacobian_NS, &user)); 426 if (app_ctx->amat_type) { 427 Mat Pmat, Amat; 428 PetscCall(DMCreateMatrix(dm, &Pmat)); 429 PetscCall(DMSetMatType(dm, app_ctx->amat_type)); 430 PetscCall(DMCreateMatrix(dm, &Amat)); 431 PetscCall(TSSetIJacobian(*ts, Amat, Pmat, NULL, NULL)); 432 PetscCall(MatDestroy(&Amat)); 433 PetscCall(MatDestroy(&Pmat)); 434 } 435 } 436 } else { 437 PetscCheck(user->op_rhs_ctx, comm, PETSC_ERR_ARG_NULL, "Problem does not provide RHSFunction"); 438 PetscCall(TSSetType(*ts, TSRK)); 439 PetscCall(TSRKSetType(*ts, TSRK5F)); 440 PetscCall(TSSetRHSFunction(*ts, NULL, RHS_NS, &user)); 441 } 442 PetscCall(TSSetMaxTime(*ts, 500. * user->units->second)); 443 PetscCall(TSSetExactFinalTime(*ts, TS_EXACTFINALTIME_STEPOVER)); 444 if (app_ctx->test_type == TESTTYPE_NONE) PetscCall(TSSetErrorIfStepFails(*ts, PETSC_FALSE)); 445 PetscCall(TSSetTimeStep(*ts, 1.e-2 * user->units->second)); 446 PetscCall(TSGetAdapt(*ts, &adapt)); 447 PetscCall(TSAdaptSetStepLimits(adapt, 1.e-12 * user->units->second, 1.e2 * user->units->second)); 448 PetscCall(TSSetFromOptions(*ts)); 449 user->time_bc_set = -1.0; // require all BCs be updated 450 if (app_ctx->cont_steps) { // continue from previous timestep data 451 PetscInt count; 452 PetscViewer viewer; 453 454 if (app_ctx->cont_time <= 0) { // Legacy files did not include step number and time 455 PetscCall(PetscViewerBinaryOpen(comm, app_ctx->cont_time_file, FILE_MODE_READ, &viewer)); 456 PetscCall(PetscViewerBinaryRead(viewer, &app_ctx->cont_time, 1, &count, PETSC_REAL)); 457 PetscCall(PetscViewerDestroy(&viewer)); 458 PetscCheck(app_ctx->cont_steps != -1, comm, PETSC_ERR_ARG_INCOMP, 459 "-continue step number not specified, but checkpoint file does not contain a step number (likely written by older code version)"); 460 } 461 PetscCall(TSSetTime(*ts, app_ctx->cont_time * user->units->second)); 462 PetscCall(TSSetStepNumber(*ts, app_ctx->cont_steps)); 463 } 464 if (app_ctx->test_type == TESTTYPE_NONE) { 465 PetscCall(TSMonitorSet(*ts, TSMonitor_NS, user, NULL)); 466 } 467 if (app_ctx->wall_forces.viewer) { 468 PetscCall(TSMonitorSet(*ts, TSMonitor_WallForce, user, NULL)); 469 } 470 if (app_ctx->turb_spanstats_enable) { 471 PetscCall(TSMonitorSet(*ts, TSMonitor_TurbulenceStatistics, user, NULL)); 472 CeedScalar previous_time = app_ctx->cont_time * user->units->second; 473 PetscCallCeed(user->ceed, 474 CeedOperatorSetContextDouble(user->spanstats.op_stats_collect_ctx->op, user->spanstats.previous_time_label, &previous_time)); 475 } 476 if (app_ctx->diff_filter_monitor) PetscCall(TSMonitorSet(*ts, TSMonitor_DifferentialFilter, user, NULL)); 477 478 if (app_ctx->sgs_train_enable) { 479 PetscCall(TSMonitorSet(*ts, TSMonitor_SGS_DD_Training, user, NULL)); 480 PetscCall(TSSetPostStep(*ts, TSPostStep_SGS_DD_Training)); 481 } 482 // Solve 483 PetscReal start_time; 484 PetscInt start_step; 485 PetscCall(TSGetTime(*ts, &start_time)); 486 PetscCall(TSGetStepNumber(*ts, &start_step)); 487 488 PetscCall(PetscLogDefaultBegin()); // So we can use PetscLogStageGetPerfInfo without -log_view 489 PetscPreLoadBegin(PETSC_FALSE, "Fluids Solve"); 490 PetscCall(TSSetTime(*ts, start_time)); 491 PetscCall(TSSetStepNumber(*ts, start_step)); 492 if (PetscPreLoadingOn) { 493 // LCOV_EXCL_START 494 SNES snes; 495 Vec Q_preload; 496 PetscReal rtol; 497 PetscCall(VecDuplicate(*Q, &Q_preload)); 498 PetscCall(VecCopy(*Q, Q_preload)); 499 PetscCall(TSGetSNES(*ts, &snes)); 500 PetscCall(SNESGetTolerances(snes, NULL, &rtol, NULL, NULL, NULL)); 501 PetscCall(SNESSetTolerances(snes, PETSC_DEFAULT, .99, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT)); 502 PetscCall(TSSetSolution(*ts, Q_preload)); 503 PetscCall(TSStep(*ts)); 504 PetscCall(SNESSetTolerances(snes, PETSC_DEFAULT, rtol, PETSC_DEFAULT, PETSC_DEFAULT, PETSC_DEFAULT)); 505 PetscCall(VecDestroy(&Q_preload)); 506 // LCOV_EXCL_STOP 507 } else { 508 PetscCall(PetscBarrier((PetscObject)*ts)); 509 PetscCall(TSSolve(*ts, *Q)); 510 } 511 PetscPreLoadEnd(); 512 513 PetscCall(TSGetSolveTime(*ts, &final_time)); 514 *f_time = final_time; 515 516 if (app_ctx->test_type == TESTTYPE_NONE) { 517 PetscInt step_no; 518 PetscCall(TSGetStepNumber(*ts, &step_no)); 519 if (user->app_ctx->checkpoint_interval > 0 || user->app_ctx->checkpoint_interval == -1) { 520 PetscCall(WriteOutput(user, *Q, step_no, final_time)); 521 } 522 523 PetscLogStage stage_id; 524 PetscEventPerfInfo stage_perf; 525 526 PetscCall(PetscLogStageGetId("Fluids Solve", &stage_id)); 527 PetscCall(PetscLogStageGetPerfInfo(stage_id, &stage_perf)); 528 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Time taken for solution (sec): %g\n", stage_perf.time)); 529 } 530 PetscFunctionReturn(PETSC_SUCCESS); 531 } 532