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c -*-Fortran-*-
/*@@
@file WaveToy.F77
@date
@author Tom Goodale, Erik Schnetter
@desc
Evolution routines for the wave equation solver
@enddesc
@@*/
#include "cctk.h"
#include "cctk_Parameters.h"
#include "cctk_Arguments.h"
/*@@
@routine WaveToyF77_Evolution
@date
@author Tom Goodale, Erik Schnetter
@desc
Evolution for the wave equation
@enddesc
@calls CCTK_SyncGroup
@calledby
@history
@endhistory
@@*/
subroutine WaveToyF77_Evolution (CCTK_ARGUMENTS)
implicit none
c Declare variables in argument list
DECLARE_CCTK_ARGUMENTS
DECLARE_CCTK_FUNCTIONS
DECLARE_CCTK_PARAMETERS
INTEGER i,j,k
INTEGER istart, jstart, kstart, iend, jend, kend
CCTK_REAL dx,dy,dz,dt
CCTK_REAL dx2,dy2,dz2,dt2
CCTK_REAL dx2i,dy2i,dz2i
CCTK_REAL factor
c call CCTK_INFO ("WaveToyF77_Evolution")
c Set up shorthands
c -----------------
dx = CCTK_DELTA_SPACE(1)
dy = CCTK_DELTA_SPACE(2)
dz = CCTK_DELTA_SPACE(3)
dt = CCTK_DELTA_TIME
dx2 = dx**2
dy2 = dy**2
dz2 = dz**2
dt2 = dt**2
dx2i = 1/dx2
dy2i = 1/dy2
dz2i = 1/dz2
istart = 2
jstart = 2
kstart = 2
iend = cctk_lsh(1)-1
jend = cctk_lsh(2)-1
kend = cctk_lsh(3)-1
factor = 2 * (1 - dt2 * (dx2i + dy2i + dz2i))
c Do the evolution
c ----------------
do k = 1, cctk_lsh(3)
do j = 1, cctk_lsh(2)
do i = 1, cctk_lsh(1)
if (phi(i,j,k).gt.1.0d10) then
print *,"problem",i,j,k
end if
phi_n(i,j,k) = 1.0d100
end do
end do
end do
do k = kstart, kend
do j = jstart, jend
do i = istart, iend
phi_n(i,j,k) = factor*phi(i,j,k) -
$ phi_p(i,j,k) + (dt2) *
$ ((phi(i+1,j,k)+phi(i-1,j,k))*dx2i
$ +(phi(i,j+1,k)+phi(i,j-1,k))*dy2i
$ +(phi(i,j,k+1)+phi(i,j,k-1))*dz2i)
end do
end do
end do
end
/*@@
@routine WaveToyF77_Boundaries
@date
@author Tom Goodale, Erik Schnetter
@desc
Boundary conditions for the wave equation
@enddesc
@history
@endhistory
@@*/
subroutine WaveToyF77_Boundaries (CCTK_ARGUMENTS)
implicit none
DECLARE_CCTK_ARGUMENTS
DECLARE_CCTK_FUNCTIONS
DECLARE_CCTK_PARAMETERS
c Local declarations
CCTK_REAL zero, one
parameter (zero=0, one=1)
CCTK_REAL finf
integer npow
integer ierr
integer sw(3)
c call CCTK_INFO ("WaveToyF77_Boundaries")
npow = 1
finf = 1
c Set the stencil width
c ---------------------
sw(1) = 1
sw(2) = 1
sw(3) = 1
c Apply the outer boundary conditions
c -----------------------------------
if (CCTK_EQUALS(bound, "flat")) then
call BndFlatVN (ierr, cctkGH, sw, "wavetoy::phi")
else if (CCTK_EQUALS(bound, "zero")) then
call BndScalarVN (ierr, cctkGH, sw, zero, "wavetoy::phi")
else if (CCTK_EQUALS(bound, "radiation")) then
call BndRadiativeVN (ierr, cctkGH, sw, zero, one,
$ "wavetoy::phi", "wavetoy::phi")
else if (CCTK_EQUALS(bound, "robin")) then
call BndRobinVN (ierr, cctkGH, sw, finf, npow, "wavetoy::phi")
else if (CCTK_EQUALS(bound, "none")) then
ierr = 0
else
call CCTK_WARN (0, "internal error")
end if
if (ierr .lt. 0) then
call CCTK_WARN (0, "Boundary conditions not applied - giving up!")
end if
c Apply the symmetry boundary conditions on any coordinate axes
c -------------------------------------------------------------
call Cart3dSymGN (ierr, cctkGH, "wavetoy::scalarevolve")
if (ierr .lt. 0) then
call CCTK_WARN (0, "Symmetry conditions not applied - giving up!")
end if
end
|
