From 57835a343e446ee7925c5952cc235242cc69e619 Mon Sep 17 00:00:00 2001
From: rhaas <rhaas@ac85fae7-cede-4708-beff-ae01c7fa1c26>
Date: Thu, 9 Aug 2012 06:26:44 +0000
Subject: Revised parameters for advected loop test

From: Josh Faber <jfaberrit@jafsmamacbook.main.ad.rit.edu>

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinInitialData/GRHydro_InitData/trunk@142 ac85fae7-cede-4708-beff-ae01c7fa1c26
---
 src/GRHydro_AdvectedLoopM.F90 | 72 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 60 insertions(+), 12 deletions(-)

diff --git a/src/GRHydro_AdvectedLoopM.F90 b/src/GRHydro_AdvectedLoopM.F90
index 81a3ede..22775ed 100644
--- a/src/GRHydro_AdvectedLoopM.F90
+++ b/src/GRHydro_AdvectedLoopM.F90
@@ -67,7 +67,7 @@ subroutine GRHydro_AdvectedLoopM(CCTK_ARGUMENTS)
   CCTK_REAL :: range_x,range_y,range_z,range_d
   CCTK_REAL :: cos_theta, sin_theta, tan_theta
   CCTK_REAL :: Bvecx_d, Bvecy_d, Bvecz_d
-  CCTK_REAL :: x_d, y_d, z_d
+  CCTK_REAL :: x_d, y_d, z_d,diaglength
   CCTK_REAL :: dx_d, dy_d, dz_d, dx_x, dz_x
 
 !!$Adiabatic index for test:
@@ -83,19 +83,47 @@ subroutine GRHydro_AdvectedLoopM(CCTK_ARGUMENTS)
   rhoval   = 1.0d0
   pressval = 3.0d0
 
+  if (CCTK_EQUALS(advectedloop_type,"2D")) then	
+
+
 !!$ Vx, Vy and Vz values:
-  if (CCTK_EQUALS(advectedloop_case,"V^z/=0")) then
-   vxval=0.2d0/sqrt(6.0d0)
-   vyval=0.5d0*vxval
-   vzval=vyval
-  else if (CCTK_EQUALS(advectedloop_case,"V^z=0")) then
-   vxval=0.2d0/sqrt(6.0d0)
-   vyval=0.5d0*vxval
-   vzval=0.0d0
-  else
-   call CCTK_WARN(0,"V^z component case not recognized!")
-  end if 
+    if (CCTK_EQUALS(advectedloop_case,"V^z/=0")) then
+
+!!$vxval=0.2d0/sqrt(6.0d0)
+!!$ This new choice yields a crossing time of exactly t=24
+!!$ assuming -1<x<1; -0.5<y<0.5
+     vxval=1.d0/12.d0
+     vyval=0.5d0*vxval
+     vzval=vyval
+
+    else if (CCTK_EQUALS(advectedloop_case,"V^z=0")) then
+!!$   vxval=0.2d0/sqrt(6.0d0)
+     vxval=1.d0/12.d0
+     vyval=0.5d0*vxval
+     vzval=0.0d0
+    else
+     call CCTK_WARN(0,"V^z component case not recognized!")
+    end if 
     
+  else if (CCTK_EQUALS(advectedloop_type,"3D")) then	
+
+     vxval=0.2d0*sqrt(2.0d0)
+     vyval=0.2d0
+
+    if (CCTK_EQUALS(advectedloop_case,"V^z/=0")) then
+
+!!$vxval=0.2d0/sqrt(6.0d0)
+!!$ This new choice yields a crossing time of exactly t=5
+!!$ assuming -1<x<1; -0.5<y<0.5
+     vzval=0.1
+
+   else if (CCTK_EQUALS(advectedloop_case,"V^z=0")) then
+     vzval=0.0d0
+    else
+     call CCTK_WARN(0,"V^z component case not recognized!")
+    end if 
+
+  endif
   nx = cctk_lsh(1)
   ny = cctk_lsh(2)
   nz = cctk_lsh(3)
@@ -110,6 +138,9 @@ subroutine GRHydro_AdvectedLoopM(CCTK_ARGUMENTS)
   range_z = (cctk_gsh(3)-1)*dz
 
   range_d = sqrt(range_z**2+range_x**2)
+  diaglength = range_x*range_z/range_d
+
+!!$ For 3-d case, the grid is going to be assumed to be a cube
 
   cos_theta = range_z/range_d
   sin_theta = range_x/range_d
@@ -162,16 +193,33 @@ subroutine GRHydro_AdvectedLoopM(CCTK_ARGUMENTS)
 
            else if (CCTK_EQUALS(advectedloop_type,"3D")) then
 
+
+!!$  tangential velocity should be parallel to (1,1,1) plus a normal component (-1,0,1)
+
              velx(i,j,k)=cos_theta*vxval-sin_theta*vzval
              vely(i,j,k)=vyval
              velz(i,j,k)=cos_theta*vzval+sin_theta*vxval
 
              Bvecz_d=0.0d0
 
+!!$ x_d = (x+z)/sqrt(2) => x_d=0 is equivalent to x+z=0
+
              x_d = cos_theta*x(i,j,k)+sin_theta*z(i,j,k)
              y_d = y(i,j,k)
              z_d = cos_theta*z(i,j,k)-sin_theta*x(i,j,k)
           
+!!$ need to make x_d periodic!
+
+       	     if(x_d.gt.1.5*diaglength) then
+	        x_d=x_d-2.0*diaglength
+             else if (x_d.gt.0.5*diaglength .and. x_d.lt.1.5*diaglength) then
+	        x_d=x_d-diaglength
+	     else if(x_d.lt.-1.5*diaglength) then
+	        x_d=x_d+2.0*diaglength
+             else if (x_d.lt.(-0.5*diaglength) .and. x_d.gt.(-1.5*diaglength)) then
+	        x_d=x_d+diaglength
+             endif
+	
              radius = sqrt(x_d**2+y_d**2)
   
              if (CCTK_EQUALS(advectedloop_delA,"Exact")) then
-- 
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