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! $Header$
! Extrapolate the difference between the grid function var and oldvar to
! var where indicated by mask. Use the normal direction given by dirx,
! diry, and dirz for extrapolation.
#include "cctk.h"
#include "cctk_Functions.h"
#include "cctk_Parameters.h"
#include "maskvalues.h"
subroutine excision_extrapolate (ierr, var, oldvar, &
mask, dirx, diry, dirz, ni, nj, nk, var0)
implicit none
DECLARE_CCTK_FUNCTIONS
DECLARE_CCTK_PARAMETERS
! Arguments
! out: zero for success, nonzero for error
integer :: ierr
! in: value of var inside mask.
CCTK_REAL :: var0
! in: array sizes for grid functions
! (you can pass in cctk_lsh(:) for these)
integer :: ni,nj,nk
! inout: grid function that should be interpolated
CCTK_REAL :: var(ni,nj,nk)
! in: other grid function for interpolation
CCTK_REAL :: oldvar(ni,nj,nk)
! in: mask
CCTK_REAL :: mask(ni,nj,nk)
! in: normal directions to use for interpolation
CCTK_REAL :: dirx(ni,nj,nk), diry(ni,nj,nk), dirz(ni,nj,nk)
integer i,j,k
integer ii,jj,kk
if (CCTK_IsThornActive(CCTK_THORNSTRING) == 0) then
call CCTK_WARN (0, "The routine excision_extrapolate was called, but thorn " // CCTK_THORNSTRING // " is not active")
end if
do k=2,nk-1
do j=2,nj-1
do i=2,ni-1
if (abs(mask(i,j,k)-MASK_BOUNDARY)<0.01) then
ii = i + int(dirx(i,j,k))
jj = j + int(diry(i,j,k))
kk = k + int(dirz(i,j,k))
var(i,j,k) = oldvar(i,j,k) + var(ii,jj,kk) - oldvar(ii,jj,kk)
else if (abs(mask(i,j,k)-MASK_EXCISED)<0.01) then
var(i,j,k) = var0
end if
end do
end do
end do
ierr = 0
end subroutine excision_extrapolate
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