petsc-main 2021-04-20
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Change a boundary condition for the model. The pointwise functions are used to provide boundary values for essential boundary conditions. In FEM, they are acting upon by dual basis functionals to generate FEM coefficients which are fixed. Natural boundary conditions signal to PETSc that boundary integrals should be performaed, using the kernels from PetscDSSetBdResidual().


#include "petscds.h" 
PetscErrorCode PetscDSUpdateBoundary(PetscDS ds, PetscInt bd, DMBoundaryConditionType type, const char name[], DMLabel label, PetscInt Nv, const PetscInt values[], PetscInt field, PetscInt Nc, const PetscInt comps[], void (*bcFunc)(void), void (*bcFunc_t)(void), void *ctx)

Input Parameters

ds - The PetscDS object
bd - The boundary condition number
type - The type of condition, e.g. DM_BC_ESSENTIAL/DM_BC_ESSENTIAL_FIELD (Dirichlet), or DM_BC_NATURAL (Neumann)
name - The BC 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
bcFunc - A pointwise function giving boundary values
bcFunc_t - A pointwise function giving the time derviative of the boundary values, or NULL
ctx - An optional user context for bcFunc


The boundary condition number is the order in which it was registered. The user can get the number of boundary conditions from PetscDSGetNumBoundary(). See PetscDSAddBoundary() for a description of the calling sequences for the callbacks.

See Also

PetscDSAddBoundary(), PetscDSGetBoundary(), PetscDSGetNumBoundary()




Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages