From 723aabe5f2be6c5ed454b04dba3e1aa928a8ef07 Mon Sep 17 00:00:00 2001
From: knarf <knarf@850bcc8b-0e4f-0410-8c26-8d28fbf1eda9>
Date: Tue, 11 Apr 2006 09:58:46 +0000
Subject: new parameter to shift the dissipation location with respect to the
 AH location

git-svn-id: http://svn.cactuscode.org/arrangements/CactusNumerical/Dissipation/trunk@20 850bcc8b-0e4f-0410-8c26-8d28fbf1eda9
---
 param.ccl          |  7 ++++++-
 src/setup_epsdis.c | 16 ++++++++--------
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/param.ccl b/param.ccl
index 4ab5b61..7e0ea25 100644
--- a/param.ccl
+++ b/param.ccl
@@ -42,9 +42,14 @@ INT update_ah_every "how often to update the AH information for dissipation" STE
 
 REAL ah_slope "Slope inside AH" STEERABLE=always
 {
-  *:* :: "0 for no dissipation.  Unstable when total epsdis<0 or total epsdis>1/3"
+  *:* :: "Slope from the outside value to the inside value in AHs"
 } 0.2
 
+REAL ah_radius_offset "Offset to the distance from the AH." STEERABLE=always
+{
+  *:* :: "negative values shift inwards, positive outwards"
+} 0.0
+
 REAL ah_max_epsdis "maximal epsdis" STEERABLE=always
 {
   *:* :: "<0 for 'off', >=0 for maximal epsdis in horizon"
diff --git a/src/setup_epsdis.c b/src/setup_epsdis.c
index b17b8cc..4be7a2c 100644
--- a/src/setup_epsdis.c
+++ b/src/setup_epsdis.c
@@ -66,7 +66,7 @@ setup_epsdis (CCTK_ARGUMENTS)
           for (i=0;i<outer_bound_npoints;i++) {
             index = CCTK_GFINDEX3D(cctkGH,i,j,k);
             indexP= CCTK_GFINDEX3D(cctkGH,outer_bound_npoints,j,k); 
-            epsdisA[index]=epsdis+ob_slope*abs(x[index]-x[indexP]);
+            epsdisA[index]=epsdis+ob_slope*fabs(x[index]-x[indexP]);
           }
         }
       }
@@ -77,7 +77,7 @@ setup_epsdis (CCTK_ARGUMENTS)
           for (i=ni;i>ni-outer_bound_npoints;i--) {
             index = CCTK_GFINDEX3D(cctkGH,i,j,k);
             indexP= CCTK_GFINDEX3D(cctkGH,ni-outer_bound_npoints,j,k); 
-            epsdisA[index]=epsdis+ob_slope*abs(x[index]-x[indexP]);
+            epsdisA[index]=epsdis+ob_slope*fabs(x[index]-x[indexP]);
           }
         }
       }
@@ -89,7 +89,7 @@ setup_epsdis (CCTK_ARGUMENTS)
           for (i=0;i<ni;i++) {
             index = CCTK_GFINDEX3D(cctkGH,i,j,k);
             indexP= CCTK_GFINDEX3D(cctkGH,i,outer_bound_npoints,k); 
-            epsdisA[index]=epsdis+ob_slope*abs(y[index]-y[indexP]);
+            epsdisA[index]=epsdis+ob_slope*fabs(y[index]-y[indexP]);
           }
         }
       }
@@ -100,7 +100,7 @@ setup_epsdis (CCTK_ARGUMENTS)
           for (i=0;i<ni;i++) {
             index = CCTK_GFINDEX3D(cctkGH,i,j,k);
             indexP= CCTK_GFINDEX3D(cctkGH,i,nj-outer_bound_npoints,k); 
-            epsdisA[index]=epsdis+ob_slope*abs(y[index]-y[indexP]);
+            epsdisA[index]=epsdis+ob_slope*fabs(y[index]-y[indexP]);
           }
         }
       }
@@ -112,7 +112,7 @@ setup_epsdis (CCTK_ARGUMENTS)
           for (i=0;i<ni;i++) {
             index = CCTK_GFINDEX3D(cctkGH,i,j,k);
             indexP= CCTK_GFINDEX3D(cctkGH,i,j,outer_bound_npoints); 
-            epsdisA[index]=epsdis+ob_slope*abs(z[index]-z[indexP]);
+            epsdisA[index]=epsdis+ob_slope*fabs(z[index]-z[indexP]);
           }
         }
       }
@@ -123,7 +123,7 @@ setup_epsdis (CCTK_ARGUMENTS)
           for (i=0;i<ni;i++) {
             index = CCTK_GFINDEX3D(cctkGH,i,j,k);
             indexP= CCTK_GFINDEX3D(cctkGH,i,j,nk-outer_bound_npoints); 
-            epsdisA[index]=epsdis+ob_slope*abs(z[index]-z[indexP]);
+            epsdisA[index]=epsdis+ob_slope*fabs(z[index]-z[indexP]);
           }
         }
       }
@@ -256,8 +256,8 @@ setup_epsdis (CCTK_ARGUMENTS)
       for (i=0;i<npts;i++) {
         radp=sqrt((xa[i]-odx)*(xa[i]-odx)+(ya[i]-ody)*(ya[i]-ody)+
                   (za[i]-odz)*(za[i]-odz));
-        if (radp<=rads[i]) {
-          epsdisA[inds[i]]=epsdis+ ah_slope*(rads[i]-radp);
+        if (radp<=rads[i]+ah_radius_offset) {
+          epsdisA[inds[i]]=epsdis+ ah_slope*(rads[i]+ah_radius_offset-radp);
           if (epsdisA[inds[i]] > ah_max_epsdis) {
             epsdisA[inds[i]] = ah_max_epsdis;
           }
-- 
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