From 310f0ea48d18866b773136aed11200b6eda6378b Mon Sep 17 00:00:00 2001
From: eschnett <>
Date: Thu, 1 Mar 2001 11:40:00 +0000
Subject: Initial revision

darcs-hash:20010301114010-f6438-12fb8a9ffcc80e86c0a97e37b5b0dae0dbc59b79.gz
---
 CarpetExtra/WaveToyFO/src/calcrhs.F77 | 98 +++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 CarpetExtra/WaveToyFO/src/calcrhs.F77

(limited to 'CarpetExtra/WaveToyFO/src/calcrhs.F77')

diff --git a/CarpetExtra/WaveToyFO/src/calcrhs.F77 b/CarpetExtra/WaveToyFO/src/calcrhs.F77
new file mode 100644
index 000000000..55734ed1e
--- /dev/null
+++ b/CarpetExtra/WaveToyFO/src/calcrhs.F77
@@ -0,0 +1,98 @@
+c     $Header: /home/eschnett/C/carpet/Carpet/CarpetExtra/WaveToyFO/src/calcrhs.F77,v 1.8 2004/08/28 19:10:33 schnetter Exp $
+
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Functions.h"
+#include "cctk_Parameters.h"
+      
+      
+      
+      function WaveToyFO_Deriv (fm2, fm1, f0, fp1, fp2, dx, dir)
+      implicit none
+      CCTK_REAL WaveToyFO_Deriv
+      CCTK_REAL fm2, fm1, f0, fp1, fp2
+      CCTK_REAL dx
+      integer dir
+      
+      if (dir .eq. 0) then
+         WaveToyFO_Deriv = (fp1 - fm1) / (2 * dx)
+      else if (dir .eq. -1) then
+c     Use first order one-sided derivatives here.
+c     These are less dissipative than second order one-sided derivatives.
+c     (Sic.)
+         WaveToyFO_Deriv = (f0 - fm1) / dx
+c$$$         WaveToyFO_Deriv = (+ 3*f0 - 4*fm1 + fm2) / (2*dx)
+      else if (dir .eq. +1) then
+         WaveToyFO_Deriv = (fp1 - f0) / dx
+c$$$         WaveToyFO_Deriv = (- 3*f0 + 4*fp1 - fp2) / (2*dx)
+      else
+         call CCTK_WARN (0, "internal error")
+      end if
+      
+      end
+      
+      
+      
+#define CHOOSEDIR(i,imin,imax) ((min(i+1,imax) - (i+1)) + (max(i-1,imin) - (i-1)))
+      
+#define DIFFX(var,i,j,k) WaveToyFO_Deriv(var((i)-2,j,k), var((i)-1,j,k), var(i,j,k), var((i)+1,j,k), var((i)+2,j,k), dx(1), idir(1))
+#define DIFFY(var,i,j,k) WaveToyFO_Deriv(var(i,(j)-2,k), var(i,(j)-1,k), var(i,j,k), var(i,(j)+1,k), var(i,(j)+2,k), dx(2), idir(2))
+#define DIFFZ(var,i,j,k) WaveToyFO_Deriv(var(i,j,(k)-2), var(i,j,(k)-1), var(i,j,k), var(i,j,(k)+1), var(i,j,(k)+2), dx(3), idir(3))
+      
+      
+      
+      subroutine WaveToyFO_CalcRHS (CCTK_ARGUMENTS)
+      implicit none
+      DECLARE_CCTK_ARGUMENTS
+      DECLARE_CCTK_FUNCTIONS
+      DECLARE_CCTK_PARAMETERS
+      
+      CCTK_REAL dx(3)
+      integer bndwidth(3)
+      integer imin(3), imax(3), idir(3)
+      integer i, j, k
+      integer d
+      
+      external WaveToyFO_Deriv
+      CCTK_REAL WaveToyFO_Deriv
+      
+      do d=1,3
+         bndwidth(d) = 0
+      end do
+      
+      do d=1,3
+         if (cctk_bbox(2*d).ne.0) then
+            imin(d) = 1+bndwidth(d)
+         else
+            imin(d) = 1+cctk_nghostzones(d)
+         end if
+         if (cctk_bbox(2*d+1).ne.0) then
+            imax(d) = cctk_lsh(d)-bndwidth(d)
+         else
+            imax(d) = cctk_lsh(d)-cctk_nghostzones(d)
+         end if
+      end do
+      
+      do d=1,3
+         dx(d) = CCTK_DELTA_SPACE(d)
+      end do
+      
+      do k=imin(3),imax(3)
+         idir(3) = CHOOSEDIR(k,imin(3),imax(3))
+         do j=imin(2),imax(2)
+            idir(2) = CHOOSEDIR(j,imin(2),imax(2))
+            do i=imin(1),imax(1)
+               idir(1) = CHOOSEDIR(i,imin(1),imax(1))
+               
+               phidot(i,j,k) =   DIFFX (psix,i,j,k)
+     $                         + DIFFY (psiy,i,j,k)
+     $                         + DIFFZ (psiz,i,j,k)
+               psixdot(i,j,k) = DIFFX (phi,i,j,k)
+               psiydot(i,j,k) = DIFFY (phi,i,j,k)
+               psizdot(i,j,k) = DIFFZ (phi,i,j,k)
+               
+            end do
+         end do
+      end do
+      
+      end
-- 
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