Date: 2022-03-31T04:48:56+00:00

Actual source code: ex1.c

      1: static char help[] = "Landau collision operator driver\n\n";

      3: #include <petscts.h>
      4: #include <petsclandau.h>

      6: int main(int argc, char **argv)
      7: {
      8:   DM             dm;
      9:   Vec            X,X_0;
     10:   PetscInt       dim=2;
     11:   TS             ts;
     12:   Mat            J;
     13:   SNES           snes;
     14:   KSP            ksp;
     15:   PC             pc;
     16:   SNESLineSearch linesearch;
     17:   PetscReal      time;

     19:   PetscInitialize(&argc, &argv, NULL,help);
     20:   PetscOptionsGetInt(NULL,NULL, "-dim", &dim, NULL);
     21:   /* Create a mesh */
     22:   DMPlexLandauCreateVelocitySpace(PETSC_COMM_SELF, dim, "", &X, &J, &dm);
     23:   DMSetUp(dm);
     24:   VecDuplicate(X,&X_0);
     25:   VecCopy(X,X_0);
     26:   DMPlexLandauPrintNorms(X,0);
     27:   DMSetOutputSequenceNumber(dm, 0, 0.0);
     28:   DMViewFromOptions(dm,NULL,"-dm_view");
     29:   VecViewFromOptions(X,NULL,"-vec_view");
     30:   /* Create timestepping solver context */
     31:   TSCreate(PETSC_COMM_SELF,&ts);
     32:   TSSetDM(ts,dm);
     33:   TSGetSNES(ts,&snes);
     34:   SNESGetLineSearch(snes,&linesearch);
     35:   SNESLineSearchSetType(linesearch,SNESLINESEARCHBASIC);
     36:   TSSetIFunction(ts,NULL,DMPlexLandauIFunction,NULL);
     37:   TSSetIJacobian(ts,J,J,DMPlexLandauIJacobian,NULL);
     38:   TSSetExactFinalTime(ts,TS_EXACTFINALTIME_STEPOVER);
     39:   SNESGetKSP(snes,&ksp);
     40:   KSPGetPC(ksp,&pc);
     41:   TSSetFromOptions(ts);
     42:   TSSetSolution(ts,X);
     43:   TSSolve(ts,X);
     44:   DMPlexLandauPrintNorms(X,1);
     45:   TSGetTime(ts, &time);
     46:   DMSetOutputSequenceNumber(dm, 1, time);
     47:   VecViewFromOptions(X,NULL,"-vec_view");
     48:   VecAXPY(X,-1,X_0);
     49:   /* clean up */
     50:   DMPlexLandauDestroyVelocitySpace(&dm);
     51:   TSDestroy(&ts);
     52:   VecDestroy(&X);
     53:   VecDestroy(&X_0);
     54:   PetscFinalize();
     55:   return 0;
     56: }

     58: /*TEST
     59:   testset:
     60:     requires: p4est !complex double
     61:     output_file: output/ex1_0.out
     62:     args: -dm_landau_num_species_grid 1,2 -petscspace_degree 3 -petscspace_poly_tensor 1 -dm_landau_type p4est -dm_landau_ion_masses 2,4 -dm_landau_ion_charges 1,18 -dm_landau_thermal_temps 5,5,.5 -dm_landau_n 1.00018,1,1e-5 -dm_landau_n_0 1e20 -ts_monitor -snes_rtol 1.e-14 -snes_stol 1.e-14 -snes_monitor -snes_converged_reason -ts_type arkimex -ts_arkimex_type 1bee -ts_max_snes_failures -1 -ts_rtol 1e-1 -ts_dt 1.e-1 -ts_max_time 1 -ts_adapt_clip .5,1.25 -ts_adapt_scale_solve_failed 0.75 -ts_adapt_time_step_increase_delay 5 -ts_max_steps 1 -pc_type lu -ksp_type preonly -dm_landau_amr_levels_max 2,1
     63:     test:
     64:       suffix: cpu
     65:       args: -dm_landau_device_type cpu
     66:     test:
     67:       suffix: kokkos
     68:       requires: kokkos_kernels
     69:       args: -dm_landau_device_type kokkos -dm_mat_type aijkokkos -dm_vec_type kokkos
     70:     test:
     71:       suffix: cuda
     72:       requires: cuda
     73:       args: -dm_landau_device_type cuda -dm_mat_type aijcusparse -dm_vec_type cuda -mat_cusparse_use_cpu_solve

     75: TEST*/