1: ! test phase space (Maxwellian) mesh construction (serial)
  2: !
  3: ! Contributed by Mark Adams
  4: program DMPlexTestLandauInterface
  5: #include <petsc/finclude/petscts.h>
  6: #include <petsc/finclude/petscdmplex.h>
  7:   use petscts
  8:   use petscdmplex
  9:   implicit none

 11:   external DMPlexLandauIFunction
 12:   external DMPlexLandauIJacobian
 13:   DM             dm
 14:   PetscInt       dim
 15:   PetscInt       ii
 16:   PetscErrorCode ierr
 17:   TS             ts
 18:   Vec            X,X_0
 19:   Mat            J
 20:   SNES           snes
 21:   KSP            ksp
 22:   PC             pc
 23:   SNESLineSearch linesearch
 24:   PetscReal      mone
 25:   PetscScalar    scalar

 27:   PetscCallA(PetscInitialize(ierr))

 29:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 30:   !  Create mesh (DM), read in parameters, create and add f_0 (X)
 31:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 32:   dim = 2
 33:   PetscCallA(DMPlexLandauCreateVelocitySpace(PETSC_COMM_WORLD, dim, '', X, J, dm, ierr))
 34:   PetscCallA(DMSetUp(dm,ierr))
 35:   PetscCallA(VecDuplicate(X,X_0,ierr))
 36:   PetscCallA(VecCopy(X,X_0,ierr))
 37:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 38:   !  View
 39:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 40:   ii = 0
 41:   PetscCallA(DMPlexLandauPrintNorms(X,ii,ierr))
 42:   mone = 0;
 43:   PetscCallA(DMSetOutputSequenceNumber(dm, ii, mone, ierr))
 44:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 45:   !    Create timestepping solver context
 46:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 47:   PetscCallA(TSCreate(PETSC_COMM_SELF,ts,ierr))
 48:   PetscCallA(TSSetOptionsPrefix(ts, 'ex1_', ierr)) ! should get this from the dm or give it to the dm
 49:   PetscCallA(TSSetDM(ts,dm,ierr))
 50:   PetscCallA(TSGetSNES(ts,snes,ierr))
 51:   PetscCallA(SNESSetOptionsPrefix(snes, 'ex1_', ierr)) ! should get this from the dm or give it to the dm
 52:   PetscCallA(SNESGetLineSearch(snes,linesearch,ierr))
 53:   PetscCallA(SNESLineSearchSetType(linesearch,SNESLINESEARCHBASIC,ierr))
 54:   PetscCallA(TSSetIFunction(ts,PETSC_NULL_VEC,DMPlexLandauIFunction,PETSC_NULL_VEC,ierr))
 55:   PetscCallA(TSSetIJacobian(ts,J,J,DMPlexLandauIJacobian,PETSC_NULL_VEC,ierr))
 56:   PetscCallA(TSSetExactFinalTime(ts,TS_EXACTFINALTIME_STEPOVER,ierr))

 58:   PetscCallA(SNESGetKSP(snes,ksp,ierr))
 59:   PetscCallA(KSPSetOptionsPrefix(ksp, 'ex1_', ierr)) ! should get this from the dm or give it to the dm
 60:   PetscCallA(KSPGetPC(ksp,pc,ierr))
 61:   PetscCallA(PCSetOptionsPrefix(pc, 'ex1_', ierr)) ! should get this from the dm or give it to the dm

 63:   PetscCallA(TSSetFromOptions(ts,ierr))
 64:   PetscCallA(TSSetSolution(ts,X,ierr))
 65:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 66:   !  Solve nonlinear system
 67:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 68:   PetscCallA(TSSolve(ts,X,ierr))
 69:   ii = 1
 70:   PetscCallA(DMPlexLandauPrintNorms(X,ii,ierr))
 71:   PetscCallA(TSGetTime(ts, mone, ierr))
 72:   PetscCallA(DMSetOutputSequenceNumber(dm, ii, mone, ierr))
 73:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 74:   !  remove f_0
 75:   ! - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 76:   scalar = -1.
 77:   PetscCallA(VecAXPY(X,scalar,X_0,ierr))
 78:   PetscCallA(DMPlexLandauDestroyVelocitySpace(dm, ierr))
 79:   PetscCallA(TSDestroy(ts, ierr))
 80:   PetscCallA(VecDestroy(X, ierr))
 81:   PetscCallA(VecDestroy(X_0, ierr))
 82:   PetscCallA(PetscFinalize(ierr))
 83: end program DMPlexTestLandauInterface

 85: !/*TEST
 86: !  build:
 87: !    requires: defined(PETSC_USING_F90FREEFORM) defined(PETSC_USE_DMLANDAU_2D)
 88: !
 89: !  test:
 90: !    suffix: 0
 91: !    requires: p4est !complex !kokkos_kernels !cuda
 92: !    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 unlimited -ex1_ts_rtol 1e-1 -ex1_ts_dt 1.e-3 -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 -dm_landau_device_type cpu -dm_landau_verbose 4 -dm_landau_normalization_grid 1
 93: !
 94: !TEST*/