C++ (Cpp) SNESFASUpSmooth_Private Exemples

Exemple #1

Fichier : fas.c Projet : masa-ito/PETScToPoisson

PetscErrorCode SNESFASCycle_Full(SNES snes, Vec X)
{
  PetscErrorCode ierr;
  Vec            F,B;
  SNES_FAS       *fas = (SNES_FAS*)snes->data;
  PetscBool      isFine;
  SNES           next;

  PetscFunctionBegin;
  F = snes->vec_func;
  B = snes->vec_rhs;
  ierr = SNESFASCycleIsFine(snes,&isFine);CHKERRQ(ierr);
  ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr);

  if (isFine) {
    ierr = SNESFASCycleSetupPhase_Full(snes);CHKERRQ(ierr);
  }

  if (fas->full_stage == 0) {
    /* downsweep */
    if (next) {
      if (fas->level != 1) next->max_its += 1;
      if (fas->full_downsweep||isFine) {ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);}
      ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr);
      ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);
      if (fas->level != 1) next->max_its -= 1;
    } else {
      /* The smoother on the coarse level is the coarse solver */
      ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);
    }
    fas->full_stage = 1;
  } else if (fas->full_stage == 1) {
    if (snes->iter == 0) {ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);}
    if (next) {
      ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr);
      ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);
    }
  }
  /* final v-cycle */
  if (isFine) {
    if (next) {
      ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr);
      ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);
    }
  }
  PetscFunctionReturn(0);
}

Exemple #2

Fichier : fas.c Projet : fengyuqi/petsc

PetscErrorCode SNESFASCycle_Kaskade(SNES snes, Vec X)
{
  PetscErrorCode ierr;
  Vec            F,B;
  SNES           next;

  PetscFunctionBegin;
  F = snes->vec_func;
  B = snes->vec_rhs;
  ierr = SNESFASCycleGetCorrection(snes,&next);CHKERRQ(ierr);
  if (next) {
    ierr = SNESFASCoarseCorrection(snes,X,F,X);CHKERRQ(ierr);
    ierr = SNESFASUpSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);
  } else {
    ierr = SNESFASDownSmooth_Private(snes,B,X,F,&snes->norm);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}

Exemple #3

Fichier : fas.c Projet : erdc-cm/petsc-dev

/*

Defines the FAS cycle as:

fine problem: F(x) = 0
coarse problem: F^c(x) = b^c

b^c = F^c(I^c_fx^f - I^c_fF(x))

correction:

x = x + I(x^c - Rx)

 */
PetscErrorCode SNESFASCycle_Multiplicative(SNES snes, Vec X)
{

  PetscErrorCode      ierr;
  Vec                 F,B;
  SNES_FAS            *fas = (SNES_FAS *)snes->data;

  PetscFunctionBegin;
  F = snes->vec_func;
  B = snes->vec_rhs;
  /* pre-smooth -- just update using the pre-smoother */
  ierr = SNESFASDownSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr);
  if (fas->level != 0) {
    ierr = SNESFASCoarseCorrection(snes, X, F, X);CHKERRQ(ierr);
    ierr = SNESFASUpSmooth_Private(snes, B, X, F, &snes->norm);CHKERRQ(ierr);
  }
  PetscFunctionReturn(0);
}