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/*@@
@file GRHydro_Flux.F90
@date Sat Jan 26 01:36:57 2002
@author Pedro Montero, Ian Hawke
@desc
The routine to calculate the numerical flux function given a
specific state
@enddesc
@@*/
#include "cctk.h"
#include "cctk_Parameters.h"
#include "cctk_Arguments.h"
/*@@
@routine num_flux
@date Sat Jan 26 01:38:12 2002
@author Pedro Montero, Ian Hawke
@desc
A general routine that works out the correct direction and returns
the appropriate flux function
@enddesc
@calls
@calledby
@history
Called from GR3D, original author Mark Miller.
@endhistory
@@*/
subroutine num_flux(xoffset,yoffset,zoffset,dens,sx,sy,sz,tau,&
densf,sxf,syf,szf,tauf,velx,vely,velz,press,det,alp,beta)
implicit none
CCTK_REAL :: dens,sx,sy,sz,tau,velx,vely,velz,det
CCTK_REAL :: densf,sxf,syf,szf,tauf
CCTK_REAL :: alp,beta,press
integer :: xoffset,yoffset,zoffset
densf = dens * ( (velx*xoffset + vely*yoffset + &
velz*zoffset) - beta / alp )
sxf = sx * ( (velx*xoffset + vely*yoffset +&
velz*zoffset) - beta/alp) + &
sqrt(det)*press*xoffset
syf = sy * ( (velx*xoffset + vely*yoffset +&
velz*zoffset) - beta/alp) + &
sqrt(det)*press*yoffset
szf = sz * ( (velx*xoffset + vely*yoffset +&
velz*zoffset) - beta/alp ) + &
sqrt(det)*press*zoffset
tauf = tau * ( (velx*xoffset + vely*yoffset +&
velz*zoffset) - beta/alp ) + &
sqrt(det)*press*(velx*xoffset +&
vely*yoffset + velz*zoffset)
end subroutine num_flux
/*@@
@routine num_x_flux
@date Sat Jan 26 01:38:55 2002
@author Pedro Montero, Ian Hawke
@desc
The numerical flux just along the x direction. Used for
fluxes along the y,z direction by permuting the appropriate
arguments in the subroutine call.
@enddesc
@calls
@calledby
@history
Culled and altered from GR3D, original author Mark Miller.
@endhistory
@@*/
subroutine num_x_flux(dens,sx,sy,sz,tau,&
densf,sxf,syf,szf,tauf,vel,press,det,alp,beta)
implicit none
CCTK_REAL :: dens,sx,sy,sz,tau,vel,det
CCTK_REAL :: densf,sxf,syf,szf,tauf
CCTK_REAL :: alp,beta,press
CCTK_REAL :: velmbetainvalp,sqrtdetpress
velmbetainvalp = vel - beta / alp
sqrtdetpress = sqrt(det)*press
densf = dens * ( velmbetainvalp )
sxf = sx * velmbetainvalp + sqrtdetpress
syf = sy * velmbetainvalp
szf = sz * velmbetainvalp
tauf = tau * velmbetainvalp + sqrtdetpress*vel
end subroutine num_x_flux
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