PetscDSGetBdResidual#

Get the pointwise boundary residual function for a given test field

Synopsis#

#include "petscds.h" 
PetscErrorCode PetscDSGetBdResidual(PetscDS ds, PetscInt f, PetscBdPointFn **f0, PetscBdPointFn **f1)

Not Collective

Input Parameters#

ds - The PetscDS
f - The test field number

Output Parameters#

f0 - boundary integrand for the test function term, see PetscBdPointFn
f1 - boundary integrand for the test function gradient term, see PetscBdPointFn

Note#

We are using a first order FEM model for the weak form:

\[ \int_\Gamma \phi {\vec f}_0(u, u_t, \nabla u, x, t) \cdot \hat n + \nabla\phi \cdot {\overleftrightarrow f}_1(u, u_t, \nabla u, x, t) \cdot \hat n \]

Level#

intermediate

Location#

src/dm/dt/interface/dtds.c

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