BurgersAdvection.c File Reference

Contains the function to compute the hyperbolic flux for the Burgers equations over the domain. More...

#include <stdlib.h>
#include <basic.h>
#include <arrayfunctions.h>
#include <physicalmodels/burgers.h>
#include <hypar.h>

Go to the source code of this file.

Functions
int	BurgersAdvection (double *f, double *u, int dir, void *s, double t)

Detailed Description

Contains the function to compute the hyperbolic flux for the Burgers equations over the domain.

Author

John Loffeld

Definition in file BurgersAdvection.c.

Function Documentation

int BurgersAdvection	(	double *	f,
		double *	u,
		int	dir,
		void *	s,
		double	t
	)

Compute the hyperbolic flux over the local domain.

\begin{equation} {\bf F}\left({\bf u}\right) = 0.5 {\bf u}^2 \end{equation}

Parameters

f	Array to hold the computed flux (same size and layout as u)
u	Array containing the conserved solution
dir	Spatial dimension
s	Solver object of type HyPar
t	Current time

Definition at line 17 of file BurgersAdvection.c.

{
  HyPar     *solver = (HyPar*)   s;
  Burgers   *param  = (Burgers*) solver->physics;
  int        i, v;

  int *dim    = solver->dim_local;
  int ghosts  = solver->ghosts;
  int ndims   = solver->ndims;
  int nvars   = solver->nvars;
  int index[ndims], bounds[ndims], offset[ndims];

  /* set bounds for array index to include ghost points */
  _ArrayCopy1D_(dim,bounds,ndims);
  for (i=0; i<ndims; i++) bounds[i] += 2*ghosts;

  /* set offset such that index is compatible with ghost point arrangement */
  _ArraySetValue_(offset,ndims,-ghosts);

  int done = 0; _ArraySetValue_(index,ndims,0);
  while (!done) {
    int p; _ArrayIndex1DWO_(ndims,dim,index,offset,ghosts,p);
    for (v = 0; v < nvars; v++) f[nvars*p+v] = 0.5 * u[nvars*p+v] * u[nvars*p+v];
    _ArrayIncrementIndex_(ndims,bounds,index,done);
  }

  return(0);
}