FPPowerSystemDiffusion.c File Reference

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

Go to the source code of this file.

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

Function Documentation

double FPPowerSystemDissipationFunction	(	int	,
		void *	,
		double
	)

Definition at line 20 of file FPPowerSystemFunctions.c.

{
  FPPowerSystem *params = (FPPowerSystem*) p;

  double dissp = 0;
  if (dir == 1) {
    double gamma = params->D / (2.0*params->H);
    dissp =   (1.0/(2.0*params->H)) * (1.0/(2.0*params->H)) 
            * ((params->l*params->q*params->q)/(params->l*gamma+1.0))
            * (1.0 - exp(-(gamma+1.0/params->l)*t));
  }

  return(dissp);
}

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

Definition at line 9 of file FPPowerSystemDiffusion.c.

{
  HyPar         *solver = (HyPar*)        s;
  FPPowerSystem *params = (FPPowerSystem*) 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);
    double dissipation = FPPowerSystemDissipationFunction(dir,params,t);
    for (v = 0; v < nvars; v++) f[nvars*p+v] = dissipation * u[nvars*p+v];
    _ArrayIncrementIndex_(ndims,bounds,index,done);
  }

  return(0);
}