Date: 2022-03-04T17:39:47+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;
     11:   PetscInt       dim=2;
     12:   TS             ts;
     13:   Mat            J;
     14:   SNES           snes;
     15:   KSP            ksp;
     16:   PC             pc;
     17:   SNESLineSearch linesearch;
     18:   PetscReal      time;

     20:   PetscInitialize(&argc, &argv, NULL,help);if (ierr) return ierr;
     21:   PetscOptionsGetInt(NULL,NULL, "-dim", &dim, NULL);
     22:   /* Create a mesh */
     23:   LandauCreateVelocitySpace(PETSC_COMM_SELF, dim, "", &X, &J, &dm);
     24:   LandauCreateMassMatrix(dm, NULL);
     25:   DMSetUp(dm);
     26:   VecDuplicate(X,&X_0);
     27:   VecCopy(X,X_0);
     28:   LandauPrintNorms(X,0);
     29:   DMSetOutputSequenceNumber(dm, 0, 0.0);
     30:   DMViewFromOptions(dm,NULL,"-dm_view");
     31:   VecViewFromOptions(X,NULL,"-vec_view");
     32:   /* Create timestepping solver context */
     33:   TSCreate(PETSC_COMM_SELF,&ts);
     34:   TSSetOptionsPrefix(ts, "ex1_");  /* should get this from the dm or give it to the dm */
     35:   TSSetDM(ts,dm);
     36:   TSGetSNES(ts,&snes);
     37:   SNESSetOptionsPrefix(snes, "ex1_");  /* should get this from the dm or give it to the dm */
     38:   SNESGetLineSearch(snes,&linesearch);
     39:   SNESLineSearchSetType(linesearch,SNESLINESEARCHBASIC);
     40:   TSSetIFunction(ts,NULL,LandauIFunction,NULL);
     41:   TSSetIJacobian(ts,J,J,LandauIJacobian,NULL);
     42:   TSSetExactFinalTime(ts,TS_EXACTFINALTIME_STEPOVER);
     43:   SNESGetKSP(snes,&ksp);
     44:   KSPSetOptionsPrefix(ksp, "ex1_");  /* should get this from the dm or give it to the dm */
     45:   KSPGetPC(ksp,&pc);
     46:   PCSetOptionsPrefix(pc, "ex1_");  /* should get this from the dm or give it to the dm */
     47:   TSSetFromOptions(ts);
     48:   TSSetSolution(ts,X);
     49:   TSSolve(ts,X);
     50:   LandauPrintNorms(X,1);
     51:   TSGetTime(ts, &time);
     52:   DMSetOutputSequenceNumber(dm, 1, time);
     53:   VecViewFromOptions(X,NULL,"-vec_view");
     54:   VecAXPY(X,-1,X_0);
     55:   /* clean up */
     56:   LandauDestroyVelocitySpace(&dm);
     57:   TSDestroy(&ts);
     58:   VecDestroy(&X);
     59:   VecDestroy(&X_0);
     60:   PetscFinalize();
     61:   return ierr;
     62: }

     64: /*TEST

     66:   test:
     67:     suffix: 0
     68:     requires: p4est !complex
     69:     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 -ex1_ts_monitor -ex1_snes_rtol 1.e-14 -ex1_snes_stol 1.e-14 -ex1_snes_monitor -ex1_snes_converged_reason -ex1_ts_type arkimex -ex1_ts_arkimex_type 1bee -ex1_ts_max_snes_failures -1 -ex1_ts_rtol 1e-1 -ex1_ts_dt 1.e-1 -ex1_ts_max_time 1 -ex1_ts_adapt_clip .5,1.25 -ex1_ts_adapt_scale_solve_failed 0.75 -ex1_ts_adapt_time_step_increase_delay 5 -ex1_ts_max_steps 1 -ex1_pc_type lu -ex1_ksp_type preonly -dm_landau_amr_levels_max 2,1

     71: TEST*/