1 #include <petsc/private/tsimpl.h> /*I "petscts.h" I*/ 2 3 const char *const TSConvergedReasons_Shifted[] = {"ADJOINT_DIVERGED_LINEAR_SOLVE", "FORWARD_DIVERGED_LINEAR_SOLVE", "DIVERGED_STEP_REJECTED", "DIVERGED_NONLINEAR_SOLVE", "CONVERGED_ITERATING", "CONVERGED_TIME", "CONVERGED_ITS", "CONVERGED_USER", "CONVERGED_EVENT", "CONVERGED_PSEUDO_FATOL", "CONVERGED_PSEUDO_FATOL", "TSConvergedReason", "TS_", NULL}; 4 const char *const *TSConvergedReasons = TSConvergedReasons_Shifted + 4; 5 6 /*@C 7 TSCreate - This function creates an empty timestepper. The problem type can then be set with TSSetProblemType() and the 8 type of solver can then be set with TSSetType(). 9 10 Collective 11 12 Input Parameter: 13 . comm - The communicator 14 15 Output Parameter: 16 . ts - The TS 17 18 Level: beginner 19 20 Developer Notes: 21 TS essentially always creates a SNES object even though explicit methods do not use it. This is 22 unfortunate and should be fixed at some point. The flag snes->usessnes indicates if the 23 particular method does use SNES and regulates if the information about the SNES is printed 24 in TSView(). TSSetFromOptions() does call SNESSetFromOptions() which can lead to users being confused 25 by help messages about meaningless SNES options. 26 27 .seealso: `TSSetType()`, `TSSetUp()`, `TSDestroy()`, `TSSetProblemType()` 28 @*/ 29 PetscErrorCode TSCreate(MPI_Comm comm, TS *ts) { 30 TS t; 31 32 PetscFunctionBegin; 33 PetscValidPointer(ts, 2); 34 *ts = NULL; 35 PetscCall(TSInitializePackage()); 36 37 PetscCall(PetscHeaderCreate(t, TS_CLASSID, "TS", "Time stepping", "TS", comm, TSDestroy, TSView)); 38 39 /* General TS description */ 40 t->problem_type = TS_NONLINEAR; 41 t->equation_type = TS_EQ_UNSPECIFIED; 42 43 t->ptime = 0.0; 44 t->time_step = 0.1; 45 t->max_time = PETSC_MAX_REAL; 46 t->exact_final_time = TS_EXACTFINALTIME_UNSPECIFIED; 47 t->steps = 0; 48 t->max_steps = PETSC_MAX_INT; 49 t->steprestart = PETSC_TRUE; 50 51 t->max_snes_failures = 1; 52 t->max_reject = 10; 53 t->errorifstepfailed = PETSC_TRUE; 54 55 t->rhsjacobian.time = PETSC_MIN_REAL; 56 t->rhsjacobian.scale = 1.0; 57 t->ijacobian.shift = 1.0; 58 59 /* All methods that do adaptivity should specify 60 * its preferred adapt type in their constructor */ 61 t->default_adapt_type = TSADAPTNONE; 62 t->atol = 1e-4; 63 t->rtol = 1e-4; 64 t->cfltime = PETSC_MAX_REAL; 65 t->cfltime_local = PETSC_MAX_REAL; 66 67 t->num_rhs_splits = 0; 68 69 t->axpy_pattern = UNKNOWN_NONZERO_PATTERN; 70 *ts = t; 71 PetscFunctionReturn(0); 72 } 73