Dune::Fem::TwistUtility< Grid > Struct Template Reference

Utility to get twist from IntersectionIterator, if provided by grid (i.e. AlbertaGrid, ALUGrid) otherwise return default values (correct for YASP). More...

#include <dune/fem/quadrature/caching/twistutility.hh>

Static Public Member Functions
template<class Intersection >
static int	twistInSelf (const GridType &, const Intersection &)
	return 0 for inner face
template<class Intersection >
static int	twistInNeighbor (const GridType &, const Intersection &)
	return 0 for outer face
template<class Intersection >
static GeometryType	elementGeometry (const Intersection &intersection, const bool inside)
	return geometry type of inside or outside entity

Detailed Description

template<class Grid>
struct Dune::Fem::TwistUtility< Grid >

Utility to get twist from IntersectionIterator, if provided by grid (i.e. AlbertaGrid, ALUGrid) otherwise return default values (correct for YASP).

The twist (t) of a face is defined in the following way:

• sign(t) gives information on the relationship between the orientation of the intersection geometry and the geometry of the corresponding codim 1 entity of the inside/outside entity:
  • sign(t)>=0: same orientation
  • sign(t)<0: opposite orientation
• The value of the twist gives information on the local numbering of the corners of the corresponding geometries. This value is only correctly defined for conforming grids, i.e., the intersection is identical to an codim 1 entity of inside/outside. In this case we have the following definition:
  • sign(t)>=0: corner[0] of inside/outside face is equal to corner[t] of intersection.
  • sign(t)<0: corner[0] of inside/outside face is equal to corner[t'] of intersection with t' = abs(t)+1.

Note

This class needs to be explicitly specialized for each grid!

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The documentation for this struct was generated from the following file:

• dune/fem/quadrature/caching/twistutility.hh