PetscDSGetBoundary

Gets a boundary condition from the model

Synopsis

#include "petscds.h" 
PetscErrorCode PetscDSGetBoundary(PetscDS ds, PetscInt bd, PetscWeakForm *wf, DMBoundaryConditionType *type, const char *name[], DMLabel *label, PetscInt *Nv, const PetscInt *values[], PetscInt *field, PetscInt *Nc, const PetscInt *comps[], PetscVoidFn **func, PetscVoidFn **func_t, void **ctx)

Input Parameters

• ds - The PetscDS object

• bd - The boundary condition number

Output Parameters

• wf - The PetscWeakForm holding the pointwise functions

• type - The type of condition, e.g. DM_BC_ESSENTIAL/DM_BC_ESSENTIAL_FIELD (Dirichlet), or DM_BC_NATURAL (Neumann)

• name - The boundary condition name

• label - The label defining constrained points

• Nv - The number of DMLabel ids for constrained points

• values - An array of ids for constrained points

• field - The field to constrain

• Nc - The number of constrained field components

• comps - An array of constrained component numbers

• func - A pointwise function giving boundary values

• func_t - A pointwise function giving the time derivative of the boundary values

• ctx - An optional user context for bcFunc

Options Database Keys

• -bc_ - Overrides the boundary ids

• -bc__comp - Overrides the boundary components

See Also

PetscDS, PetscWeakForm, DMBoundaryConditionType, PetscDSAddBoundary(), DMLabel

Level

developer

Location

src/dm/dt/interface/dtds.c

Examples

src/snes/tutorials/ex71.c
src/snes/tutorials/ex56.c
src/snes/tutorials/ex24.c
src/snes/tutorials/ex77.c
src/snes/tutorials/ex27.c
src/ts/tutorials/ex76.c
src/ts/tutorials/ex53.c
src/snes/tutorials/ex12.c
src/snes/tutorials/ex17.c

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