DMMoabFEMComputeBasis#

Evaluate bases and derivatives at quadrature points for a linear EDGE/QUAD/TRI/HEX/TET element.

Synopsis#

#include "petscdt.h" 
#include "petscdmmoab.h"   
PetscErrorCode DMMoabFEMComputeBasis(const PetscInt dim, const PetscInt nverts, const PetscReal *coordinates, const PetscQuadrature quadrature, PetscReal *phypts, PetscReal *jacobian_quadrature_weight_product, PetscReal *fe_basis, PetscReal **fe_basis_derivatives)

The routine takes the coordinates of the vertices of an element and computes basis functions associated with each quadrature point provided, and their derivatives with respect to X, Y and Z as appropriate.

Input Parameters#

  • PetscInt nverts - the number of element vertices

  • PetscReal coords[3nverts] -* the physical coordinates of the vertices (in canonical numbering)

  • PetscInt npts - the number of evaluation points (quadrature points)

  • PetscReal quad[3npts] -* the evaluation points (quadrature points) in the reference space

Output Parameters#

  • PetscReal phypts[3npts] -* the evaluation points (quadrature points) transformed to the physical space

  • PetscReal jxw[npts] - the jacobian determinant * quadrature weight necessary for assembling discrete contributions

  • PetscReal fe_basis[npts] - the bases values evaluated at the specified quadrature points

  • PetscReal fe_basis_derivatives[dim][npts] - the derivative of the bases wrt (X,Y,Z)-directions (depending on the dimension) evaluated at the specified quadrature points

Level#

advanced

Location#

src/dm/impls/moab/dmmbfem.cxx

Examples#

src/ksp/ksp/tutorials/ex35.cxx
src/ksp/ksp/tutorials/ex36.cxx

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Index of all DMMOAB routines
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Index of all manual pages