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/*@@
@file SetTime.c
@date Mon May 20 09:45:45 2002
@author Ian Hawke
@desc
Sets the time and dt depending on the ODE method and
position in the loop.
@enddesc
@version $Header$
@@*/
#include <stdlib.h>
#include "cctk.h"
#include "cctk_Arguments.h"
#include "cctk_Parameters.h"
static const char *rcsid = "$Header$";
CCTK_FILEVERSION(CactusBase_MoL_SetTime_c);
/* #define MOLDEBUG 1 */
/********************************************************************
********************* Local Data Types ***********************
********************************************************************/
/********************************************************************
********************* Local Routine Prototypes *********************
********************************************************************/
/********************************************************************
***************** Scheduled Routine Prototypes *********************
********************************************************************/
int MoL_SetTime(CCTK_ARGUMENTS);
int MoL_ResetTime(CCTK_ARGUMENTS);
int MoL_ResetDeltaTime(CCTK_ARGUMENTS);
/********************************************************************
********************* Other Routine Prototypes *********************
********************************************************************/
/********************************************************************
********************* Local Data *****************************
********************************************************************/
/********************************************************************
********************* External Routines **********************
********************************************************************/
/*@@
@routine MoL_SetTime
@date Mon May 20 09:48:55 2002
@author Ian Hawke
@desc
Sets the time and timestep before the MoL evolution loop starts.
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
int MoL_SetTime(CCTK_ARGUMENTS)
{
DECLARE_CCTK_ARGUMENTS;
DECLARE_CCTK_PARAMETERS;
CCTK_REAL beta;
*Original_Time = cctkGH->cctk_time;
*Original_Delta_Time = cctkGH->cctk_delta_time;
cctkGH->cctk_time -= cctkGH->cctk_delta_time / cctkGH->cctk_timefac;
if (CCTK_EQUALS(ODE_Method,"ICN"))
{
cctkGH->cctk_delta_time = 0.5*(*Original_Delta_Time);
}
else if (CCTK_EQUALS(ODE_Method,"ICN-avg"))
{
cctkGH->cctk_delta_time = *Original_Delta_Time;
}
else if (CCTK_EQUALS(ODE_Method,"Generic"))
{
beta = RKBetaCoefficients[0];
cctkGH->cctk_delta_time = beta*(*Original_Delta_Time);
}
return 0;
}
/*@@
@routine MoL_ResetTime
@date Mon May 20 09:49:41 2002
@author Ian Hawke
@desc
Sets the time during the MoL evolution loop.
At the last time all methods should end up with the original
values for time and timestep.
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
int MoL_ResetTime(CCTK_ARGUMENTS)
{
DECLARE_CCTK_ARGUMENTS;
DECLARE_CCTK_PARAMETERS;
CCTK_REAL *previous_times;
CCTK_INT alphaindex, i, j;
previous_times = (CCTK_REAL*)malloc(MoL_Intermediate_Steps*sizeof(CCTK_REAL));
if (!previous_times)
{
CCTK_WARN(0,"Failed to allocate memory for very small array!");
}
if (*MoL_Intermediate_Step == 0)
{
cctkGH->cctk_time = (*Original_Time);
}
else if (CCTK_EQUALS(ODE_Method,"ICN"))
{
cctkGH->cctk_time = (*Original_Time) -
0.5*(*Original_Delta_Time)/cctkGH->cctk_timefac;
}
else if (CCTK_EQUALS(ODE_Method,"ICN-avg"))
{
cctkGH->cctk_time = (*Original_Time);
}
else if (CCTK_EQUALS(ODE_Method,"Generic"))
{
previous_times[0] = (*Original_Time) -
(*Original_Delta_Time)/cctkGH->cctk_timefac;
for (i = MoL_Intermediate_Steps - 1; i > *MoL_Intermediate_Step - 1; i--)
{
previous_times[MoL_Intermediate_Steps - i] =
RKBetaCoefficients[MoL_Intermediate_Steps - i - 1] *
(*Original_Delta_Time)/cctkGH->cctk_timefac;
for (j = MoL_Intermediate_Steps; j > i; j--)
{
alphaindex = (MoL_Intermediate_Steps - i - 1) *
MoL_Intermediate_Steps + MoL_Intermediate_Steps - j;
previous_times[MoL_Intermediate_Steps - i] +=
RKAlphaCoefficients[alphaindex] *
previous_times[MoL_Intermediate_Steps - j];
#ifdef MOLDEBUG
printf("i %d j %d is %d index %d t %g dt %g alpha %g beta %g\n",
i, j, MoL_Intermediate_Steps, alphaindex,
previous_times[MoL_Intermediate_Steps - i],
(*Original_Delta_Time)/cctkGH->cctk_timefac,
RKAlphaCoefficients[alphaindex],
RKBetaCoefficients[MoL_Intermediate_Steps - i - 1]);
#endif
}
}
#ifdef MOLDEBUG
printf("MoL says the previous times are ");
for (i = 0; i < MoL_Intermediate_Steps - *MoL_Intermediate_Step
+ 1; i++)
{
printf("%g ", previous_times[i]);
}
printf("\n");
#endif
cctkGH->cctk_time = previous_times[MoL_Intermediate_Steps -
*MoL_Intermediate_Step];
}
else if (CCTK_EQUALS(ODE_Method,"RK2"))
{
if (*MoL_Intermediate_Step == 1)
{
cctkGH->cctk_time = (*Original_Time);
}
}
else if (CCTK_EQUALS(ODE_Method,"RK3"))
{
if (*MoL_Intermediate_Step == 2)
{
cctkGH->cctk_time = (*Original_Time);
}
else if (*MoL_Intermediate_Step == 1)
{
cctkGH->cctk_time = (*Original_Time) -
0.5*(*Original_Delta_Time)/cctkGH->cctk_timefac;
}
}
#ifdef MOLDEBUG
printf("MoL has once more reset t (%d): %f.\n",
*MoL_Intermediate_Step, cctkGH->cctk_time);
fflush(stdout);
#endif
free(previous_times);
previous_times = NULL;
return 0;
}
/*@@
@routine MoL_ResetDeltaTime
@date Mon May 20 09:49:41 2002
@author Ian Hawke
@desc
Sets the timestep during the MoL evolution loop.
At the last time all methods should end up with the original
values for time and timestep.
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
int MoL_ResetDeltaTime(CCTK_ARGUMENTS)
{
DECLARE_CCTK_ARGUMENTS;
DECLARE_CCTK_PARAMETERS;
if (*MoL_Intermediate_Step == 0)
{
cctkGH->cctk_delta_time = (*Original_Delta_Time);
}
else if (CCTK_EQUALS(ODE_Method,"ICN"))
{
if (*MoL_Intermediate_Step == 1)
{
cctkGH->cctk_delta_time = (*Original_Delta_Time);
}
else
{
cctkGH->cctk_delta_time = 0.5*(*Original_Delta_Time);
}
}
else if (CCTK_EQUALS(ODE_Method,"ICN-avg"))
{
cctkGH->cctk_delta_time = (*Original_Delta_Time);
}
else if (CCTK_EQUALS(ODE_Method,"Generic"))
{
cctkGH->cctk_delta_time = RKBetaCoefficients[MoL_Intermediate_Steps -
(*MoL_Intermediate_Step)] *
(*Original_Delta_Time);
}
else if (CCTK_EQUALS(ODE_Method,"RK2"))
{
if (*MoL_Intermediate_Step == 1)
{
cctkGH->cctk_delta_time = 0.5*(*Original_Delta_Time);
}
}
else if (CCTK_EQUALS(ODE_Method,"RK3"))
{
if (*MoL_Intermediate_Step == 2)
{
cctkGH->cctk_delta_time = 0.25*(*Original_Delta_Time);
}
else if (*MoL_Intermediate_Step == 1)
{
cctkGH->cctk_delta_time = 2.0/3.0*(*Original_Delta_Time);
}
}
#ifdef MOLDEBUG
printf("MoL has once more reset dt (%d): %f.\n",
*MoL_Intermediate_Step,
cctkGH->cctk_delta_time/cctkGH->cctk_timefac);
fflush(stdout);
#endif
return 0;
}
/********************************************************************
********************* Local Routines *************************
********************************************************************/
|
