Current RIT GRMHD code contributions:

Add the magnetized counterparts for several GRHydro routines.

Adjust interface.ccl, param.ccl and schedule.ccl appropriately.



git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinEvolve/GRHydro/trunk@158 c83d129a-5a75-4d5a-9c4d-ed3a5855bf45

1 files changed, 58 insertions, 0 deletions

diff --git a/src/GRHydro_UtilsM.F90 b/src/GRHydro_UtilsM.F90
new file mode 100644
index 0000000..d3239f8
--- /dev/null
+++ b/src/GRHydro_UtilsM.F90
@@ -0,0 +1,58 @@
+/*@@
+@file      UtilsM.F
+@date      Aug 30, 2010
+@author    Joshua Faber, Scott Noble, Bruno Mundim
+@desc 
+Utility functions for other thorns. 
+@enddesc 
+@@*/
+
+#include "cctk.h"
+#include "cctk_Parameters.h"
+#include "cctk_Arguments.h"
+
+
+subroutine calc_vlow_blow(gxx,gxy,gxz,gyy,gyz,gzz, &
+     velx,vely,velz,Bvecx,Bvecy,Bvecz, &
+     velxlow,velylow,velzlow,Bvecxlow,Bvecylow,Bveczlow, &
+     Bdotv,b2,v2,w,bxlow,bylow,bzlow)
+  
+!!$ Calculates v_i (see Anton Eq. 5) and B_i (Bvecxlow)- undensitized!
+!!$ calculates B^i v_i [Anton eq. 44] and b^2 [LHS of Anton eq. 46] 
+!!$ Calculates w (Lorentz factor) as (1-v^i v_i)^{-1/2}
+!!$ Calculates b_i (bxlow)
+
+  CCTK_REAL :: gxx,gxy,gxz,gyy,gyz,gzz
+  CCTK_REAL :: velx,vely,velz,Bvecx,Bvecy,Bvecz
+  CCTK_REAL :: velxlow,velylow,velzlow
+  CCTK_REAL :: Bvecxlow,Bvecylow,Bveczlow
+  CCTK_REAL :: Bdotv,v2,w,b2,bxlow,bylow,bzlow
+
+!!$ vel_i  = g_ij v^j
+!!$ B_i = g_ij B^i
+
+  velxlow = gxx*velx + gxy*vely + gxz*velz
+  velylow = gxy*velx + gyy*vely + gyz*velz
+  velzlow = gxz*velx + gyz*vely + gzz*velz
+  Bvecxlow = gxx*Bvecx + gxy*Bvecy + gxz*Bvecz
+  Bvecylow = gxy*Bvecx + gyy*Bvecy + gyz*Bvecz
+  Bveczlow = gxz*Bvecx + gyz*Bvecy + gzz*Bvecz
+ 
+!!$  B^i v_i (= b^0/u^0)
+  Bdotv = velxlow*Bvecx+velylow*Bvecy+velzlow*Bvecz
+  
+!!$v^2 = v_i v^i; w=(1-v^2)^{-1/2}
+
+  v2 = velxlow*velx + velylow*vely + velzlow*velz
+  w = 1.d0/sqrt(1.d0-v2)
+
+!!$b^2 = B^i B_i / w^2 + (b^0/u^0)^2
+
+  b2=(Bvecx*Bvecxlow+Bvecy*Bvecylow+Bvecz*Bveczlow)/w**2+Bdotv**2
+
+!!$ b_i = B_i/w +w*(B dot v)*v_i
+  bxlow = Bvecxlow/w+w*Bdotv*velxlow
+  bylow = Bvecylow/w+w*Bdotv*velylow
+  bzlow = Bveczlow/w+w*Bdotv*velzlow
+
+end subroutine calc_vlow_blow