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/*@@
@file Euler.c
@date 2012-12-05
@author Erik Schnetter
@desc
An explicit Euler time integrator. This method is unstable in most
cases, but is sometimes useful for debugging.
@enddesc
@version $Header$
@@*/
#include "cctk.h"
#include "cctk_Arguments.h"
#include "cctk_Parameters.h"
#include "ExternalVariables.h"
#include "Operators.h"
static const char *rcsid = "$Header$";
CCTK_FILEVERSION(CactusBase_MoL_Euler_c);
/********************************************************************
********************* Local Data Types ***********************
********************************************************************/
/********************************************************************
********************* Local Routine Prototypes *********************
********************************************************************/
/********************************************************************
***************** Scheduled Routine Prototypes *********************
********************************************************************/
void MoL_EulerAdd(CCTK_ARGUMENTS);
/********************************************************************
********************* Other Routine Prototypes *********************
********************************************************************/
/********************************************************************
********************* Local Data *****************************
********************************************************************/
/********************************************************************
********************* External Routines **********************
********************************************************************/
/*@@
@routine MoL_EulerAdd
@date 2012-12-05
@author Erik Schnetter
@desc
Performs first order Euler time integration.
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
void MoL_EulerAdd(CCTK_ARGUMENTS)
{
DECLARE_CCTK_ARGUMENTS;
DECLARE_CCTK_PARAMETERS;
int totalsize = 1;
for (int arraydim = 0; arraydim < cctk_dim; arraydim++)
{
totalsize *= cctk_ash[arraydim];
}
switch (*MoL_Intermediate_Step)
{
case 1:
{
for (int var = 0; var < MoLNumEvolvedVariables; var++)
{
int const nsrcs = 2;
CCTK_INT const srcs[] =
{EvolvedVariableIndex[var], RHSVariableIndex[var]};
CCTK_INT const tls[] = {1, 0};
CCTK_REAL const facts[] = {1.0, CCTK_DELTA_TIME};
MoL_LinearCombination(cctkGH,
EvolvedVariableIndex[var], 0.0,
srcs, tls, facts, nsrcs);
}
for (int var = 0; var < MoLNumEvolvedArrayVariables; var++)
{
int const nsrcs = 2;
CCTK_INT const srcs[] =
{EvolvedArrayVariableIndex[var], RHSArrayVariableIndex[var]};
CCTK_INT const tls[] = {1, 0};
CCTK_REAL const facts[] = {1.0, CCTK_DELTA_TIME};
MoL_LinearCombination(cctkGH,
EvolvedArrayVariableIndex[var], 0.0,
srcs, tls, facts, nsrcs);
}
break;
}
default:
{
CCTK_WARN(CCTK_WARN_ABORT,
"Euler expects MoL_Intermediate_Step to be in [1,1]. "
"This should be caught at ParamCheck - bug Ian!");
}
}
}
/********************************************************************
********************* Local Routines *************************
********************************************************************/
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