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/*@@
@file WaveToyF90.F
@date
@author Tom Goodale
@desc
Evolution routines for the wave equation solver
@enddesc
@@*/
#include "cctk.h"
#include "cctk_parameters.h"
#include "cctk_arguments.h"
/*@@
@routine WaveToyF90_Boundaries
@date
@author Tom Goodale
@desc
Boundary conditions for the wave equation
@enddesc
@calls ApplyFlatBC,ApplyRadiativeBC
@calledby
@history
@endhistory
@@*/
subroutine WaveToyF90_Boundaries(CCTK_FARGUMENTS)
implicit none
DECLARE_CCTK_FARGUMENTS
DECLARE_CCTK_PARAMETERS
INTEGER,DIMENSION(3):: sw=1
CCTK_REAL,PARAMETER :: zero = 0.0
INTEGER CCTK_Equals
call ApplySymmetry(cctkGH,"wavetoy::scalarevolve")
if (CCTK_Equals(bound,"flat")==1) then
call ApplyFlatBC(cctkGH,sw,"wavetoy::phi")
else if (CCTK_Equals(bound,"radiation")==1) then
call ApplyRadiativeBC(cctkGH,zero,sw,"wavetoy::phi","wavetoy::phi_old")
end if
end subroutine wavetoyf90_boundaries
c --------------------------------------------------------------
/*@@
@routine WaveToyF90_Evolution
@date
@author Tom Goodale
@desc
Evolution for the wave equation
@enddesc
@calls CCTK_SyncGroup, wavetoy_boundaries
@calledby
@history
@endhistory
@@*/
subroutine wavetoyf90_evolution(CCTK_FARGUMENTS)
implicit none
DECLARE_CCTK_FARGUMENTS
DECLARE_CCTK_PARAMETERS
c Declare local variables
INTEGER :: i,j,k
INTEGER :: istart, jstart, kstart, iend, jend, kend
CCTK_REAL :: dx,dy,dz,dt
c Set up shorthands
c -----------------
dx = cctk_delta_space(1)
dy = cctk_delta_space(2)
dz = cctk_delta_space(3)
dt = cctk_delta_time
istart = 2
jstart = 2
kstart = 2
iend = cctk_lsh(1)-1
jend = cctk_lsh(2)-1
kend = cctk_lsh(3)-1
c Do the evolution
c ----------------
do k = kstart, kend
do j = jstart, jend
do i = istart, iend
phi_tmp(i,j,k) =
1 2.0*(1.0 - (dt**2)*(1.0/dx**2 +
2 1.0/dy**2 +1.0/dz**2))*phi(i,j,k) -
3 phi_old(i,j,k) + (dt**2) *
5 ((phi(i+1,j,k)+phi(i-1,j,k))/dx**2
6 +(phi(i,j+1,k)+phi(i,j-1,k))/dy**2
7 +(phi(i,j,k+1)+phi(i,j,k-1))/dz**2)
end do
end do
end do
c Update timeslices
c -----------------
phi_old = phi
phi = phi_tmp
c Apply boundary conditions
c -------------------------
call wavetoyf90_boundaries(CCTK_FARGUMENTS)
c Synchronize
c -----------
call CCTK_SyncGroup(cctkGH,"wavetoy::scalarevolve")
end subroutine wavetoyf90_evolution
c --------------------------------------------------------------
|
