Move thorn TmunuBase from AEIThorns to CactusEinstein.

Thorn TmunuBase provides grid functions for the stress-energy tensor
T_ab.  This allows spacetime codes to be independent of hydrodynamics
formulations, or other formulations contributing to the stress-energy
tensor.

TmunuBase is backwards compatible with the old CalcTmunu.inc
mechanism.


git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinBase/TmunuBase/trunk@2 b83b3108-af97-48ba-8c81-9293ccf7f924

1 files changed, 44 insertions, 0 deletions

diff --git a/src/CopyTmunu.F90 b/src/CopyTmunu.F90
new file mode 100644
index 0000000..dde5804
--- /dev/null
+++ b/src/CopyTmunu.F90
@@ -0,0 +1,44 @@
+#include "cctk.h"
+#include "cctk_Arguments.h"
+#include "cctk_Parameters.h"
+
+
+
+! Calculate the T2munu copy.
+! On input, T2munu contains the contribution to Tmunu that is calculated
+! via the CalcTmunu.inc mechanism, and Tmunu contains the complete stress
+! energy tensor.
+! On output, T2munu should contain the contribution to Tmunu that is
+! calculated via the AddToTmunu mechanism.
+! We just need to calculate the difference.
+
+subroutine TmunuBase_CopyTmunu (CCTK_ARGUMENTS)
+  implicit none
+  DECLARE_CCTK_ARGUMENTS
+  DECLARE_CCTK_PARAMETERS
+  
+  if (support_old_CalcTmunu_mechanism == 0) then
+     call CCTK_WARN (0, "internal error")
+  end if
+  
+  if (stress_energy_state == 0) then
+     call CCTK_WARN (1, "The stress energy tensor does not have storage")
+     return
+  end if
+  
+  stress_energy_2_state = stress_energy_state
+  
+  eT2tt = eTtt - eT2tt
+  
+  eT2tx = eTtx - eT2tx
+  eT2ty = eTty - eT2ty
+  eT2tz = eTtz - eT2tz
+  
+  eT2xx = eTxx - eT2xx
+  eT2xy = eTxy - eT2xy
+  eT2xz = eTxz - eT2xz
+  eT2yy = eTyy - eT2yy
+  eT2yz = eTyz - eT2yz
+  eT2zz = eTzz - eT2zz
+  
+end subroutine TmunuBase_CopyTmunu