Check that the boundary regions (where the stencils need to be

one-sided) do not overlap.

Check the number of ghost zones.


git-svn-id: https://svn.cct.lsu.edu/repos/numrel/LSUThorns/SummationByParts/trunk@81 f69c4107-0314-4c4f-9ad4-17e986b73f4a

1 files changed, 10 insertions, 0 deletions

diff --git a/src/Derivatives_2_1.F90 b/src/Derivatives_2_1.F90
index 8192a71..788d325 100644
--- a/src/Derivatives_2_1.F90
+++ b/src/Derivatives_2_1.F90
@@ -37,6 +37,8 @@ subroutine deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, dvar )
 
   idel = 1.0_wp / delta
 
+  if (gsize < 1) call CCTK_WARN (0, "not enough ghostzones")
+
   direction: select case (dir)
   case (0) direction
     if ( bb(1) == 0 ) then
@@ -55,6 +57,7 @@ subroutine deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, dvar )
                          q(2,1) * var(ni-1,:,:) ) * idel
       ir = ni - 2
     end if
+    if (il > ir+1) call CCTK_WARN (0, "domain too small")
     dvar(il:ir,:,:) = a(1) * ( var(il+1:ir+1,:,:) - var(il-1:ir-1,:,:) ) * idel
   case (1) direction
     if ( zero_derivs_y /= 0 ) then
@@ -76,6 +79,7 @@ subroutine deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, dvar )
                            q(2,1) * var(:,nj-1,:) ) * idel
         jr = nj - 2
       end if
+      if (jl > jr+1) call CCTK_WARN (0, "domain too small")
       dvar(:,jl:jr,:) = a(1) * ( var(:,jl+1:jr+1,:) - &
                                  var(:,jl-1:jr-1,:) ) * idel
     end if
@@ -99,6 +103,7 @@ subroutine deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, dvar )
                            q(2,1) * var(:,:,nk-1) ) * idel
         kr = nk - 2
       end if
+      if (kl > kr+1) call CCTK_WARN (0, "domain too small")
       dvar(:,:,kl:kr) = a(1) * ( var(:,:,kl+1:kr+1) -  &
                                  var(:,:,kl-1:kr-1) ) * idel
     end if
@@ -159,6 +164,8 @@ subroutine up_deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, up, dvar )
 
   idel = 1.0_wp / delta
 
+  if (gsize < 1) call CCTK_WARN (0, "not enough ghostzones")
+
   direction: select case (dir)
   case (0) direction
     if ( bb(1) == 0 ) then
@@ -199,6 +206,7 @@ subroutine up_deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, up, dvar )
       end where
       ir = ni - 2
     end if
+    if (il > ir+1) call CCTK_WARN (0, "domain too small")
     where ( up(il:ir,:,:) < zero ) 
       dvar(il:ir,:,:) = ( a1(-1) * var(il-1:ir-1,:,:) + &
                           a1(0)  * var(il:ir,:,:) + &
@@ -250,6 +258,7 @@ subroutine up_deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, up, dvar )
         end where
         jr = nj - 2
       end if
+      if (jl > jr+1) call CCTK_WARN (0, "domain too small")
       where ( up(:,jl:jr,:) < zero ) 
         dvar(:,jl:jr,:) = ( a1(-1) * var(:,jl-1:jr-1,:) + &
                             a1(0)  * var(:,jl:jr,:) + &
@@ -302,6 +311,7 @@ subroutine up_deriv_gf_2_1 ( var, ni, nj, nk, dir, bb, gsize, delta, up, dvar )
         end where
         kr = nk - 2
       end if
+      if (kl > kr+1) call CCTK_WARN (0, "domain too small")
       where ( up(:,:,kl:kr) < zero )
         dvar(:,:,kl:kr) = ( a1(-1) * var(:,:,kl-1:kr-1) + &
                             a1(0)  * var(:,:,kl:kr) + &