BCExtrapolate.c File Reference

Extrapolation boundary condition. More...

#include <stdlib.h>
#include <basic.h>
#include <arrayfunctions.h>
#include <boundaryconditions.h>

Go to the source code of this file.

Functions
int	BCExtrapolateU (void *b, void *m, int ndims, int nvars, int *size, int ghosts, double *phi, double waqt)

Detailed Description

Extrapolation boundary condition.

Author

Debojyoti Ghosh

Definition in file BCExtrapolate.c.

Function Documentation

int BCExtrapolateU	(	void *	b,
		void *	m,
		int	ndims,
		int	nvars,
		int *	size,
		int	ghosts,
		double *	phi,
		double	waqt
	)

Apply the extrapolative boundary condition: Values at the physical boundary ghost points are extrapolated from the interior points adjacent to the boundary

Parameters

b	Boundary object of type DomainBoundary
m	MPI object of type MPIVariables
ndims	Number of spatial dimensions
nvars	Number of variables/DoFs per grid point
size	Integer array with the number of grid points in each spatial dimension
ghosts	Number of ghost points
phi	The solution array on which to apply the boundary condition
waqt	Current solution time

Definition at line 13 of file BCExtrapolate.c.

{
  DomainBoundary *boundary = (DomainBoundary*) b;

  int dim   = boundary->dim;
  int face  = boundary->face;

  if (boundary->on_this_proc) {
    int bounds[ndims], indexb[ndims], indexi[ndims];
    _ArraySubtract1D_(bounds,boundary->ie,boundary->is,ndims);
    _ArraySetValue_(indexb,ndims,0);
    int done = 0;
    while (!done) {
      _ArrayCopy1D_(indexb,indexi,ndims);
      _ArrayAdd1D_(indexi,indexi,boundary->is,ndims);
      if (face == 1)        indexi[dim] = ghosts-1-indexb[dim];
      else if (face == -1)  indexi[dim] = size[dim]-indexb[dim]-1;
      else                  return(1);
      int p1,p2;
      _ArrayIndex1DWO_(ndims,size,indexb,boundary->is,ghosts,p1);
      _ArrayIndex1D_(ndims,size,indexi,ghosts,p2);
      _ArrayCopy1D_((phi+nvars*p2),(phi+nvars*p1),nvars);
      _ArrayIncrementIndex_(ndims,bounds,indexb,done);
    }
  }
  return(0);
}