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/*@@
@file GRHydro_Shift.F90
@date Fri Mar 14 17:36:37 2003
@author Ian Hawke
@desc
Set the shift so that it is approximately comoving with the
velocity.
@enddesc
@@*/
#include "cctk.h"
#include "cctk_Parameters.h"
#include "cctk_Arguments.h"
#include "cctk_Functions.h"
/*@@
@routine GRHydro_ComovingShift
@date Fri Mar 14 17:37:30 2003
@author Ian Hawke
@desc
Implements the comoving shift
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
subroutine GRHydro_ComovingShift(CCTK_ARGUMENTS)
implicit none
DECLARE_CCTK_ARGUMENTS
DECLARE_CCTK_PARAMETERS
DECLARE_CCTK_FUNCTIONS
CCTK_INT :: ierr, Reduction_Handle, VarIndex
CCTK_REAL :: rho_max
CCTK_REAL, dimension(cctk_lsh(1),cctk_lsh(2),cctk_lsh(3)) :: attenuate
call CCTK_ReductionHandle(Reduction_Handle, "maximum")
call CCTK_VarIndex(VarIndex, "HydroBase::rho")
call CCTK_Reduce(ierr, cctkGH, -1, Reduction_Handle, &
1, CCTK_VARIABLE_REAL, rho_max, 1, VarIndex)
if (ierr .ne. 0) then
call CCTK_WARN(0, "Failed to find rho_max")
end if
!!$ Hard wire in nuclear density
if (CCTK_EQUALS(comoving_attenuate,"sqrt")) then
attenuate = sqrt(rho / rho_max)
else if (CCTK_EQUALS(comoving_attenuate,"tanh")) then
attenuate = 0.5d0*(tanh(comoving_tanh_factor*&
(rho/rho_max - comoving_tanh_offset)) + 1.d0 )
else
attenuate = 1.d0
end if
if (rho_max < 0.000324d0) then
if (CCTK_EQUALS(comoving_v_method,"projected")) then
where (rho > 10.d0 * GRHydro_rho_min)
betax = -comoving_factor*x*alp*(x*vel(:,:,:,1) + y*vel(:,:,:,2) + z*vel(:,:,:,3)) / &
(r**2 + 1.d-10) * attenuate
betay = -comoving_factor*y*alp*(x*vel(:,:,:,1) + y*vel(:,:,:,2) + z*vel(:,:,:,3)) / &
(r**2 + 1.d-10) * attenuate
betaz = -comoving_factor*z*alp*(x*vel(:,:,:,1) + y*vel(:,:,:,2) + z*vel(:,:,:,3)) / &
(r**2 + 1.d-10) * attenuate
elsewhere
betax = 0.d0
betay = 0.d0
betaz = 0.d0
end where
else if (CCTK_EQUALS(comoving_v_method,"components")) then
where (rho > 10.d0 * GRHydro_rho_min)
betax = comoving_factor * alp * x / (r + 1.d-10) * sqrt( (&
(vel_p(:,:,:,1) - betax_p / alp_p)**2 + &
(vel_p(:,:,:,2) - betay_p / alp_p)**2 + &
(vel_p(:,:,:,3) - betaz_p / alp_p)**2) ) * attenuate
betay = comoving_factor * alp * y / (r + 1.d-10) * sqrt( (&
(vel_p(:,:,:,1) - betax_p / alp_p)**2 + &
(vel_p(:,:,:,2) - betay_p / alp_p)**2 + &
(vel_p(:,:,:,3) - betaz_p / alp_p)**2) ) * attenuate
betaz = comoving_factor * alp * z / (r + 1.d-10) * sqrt( (&
(vel_p(:,:,:,1) - betax_p / alp_p)**2 + &
(vel_p(:,:,:,2) - betay_p / alp_p)**2 + &
(vel_p(:,:,:,3) - betaz_p / alp_p)**2) ) * attenuate
elsewhere
betax = 0.d0
betay = 0.d0
betaz = 0.d0
end where
end if
else
betax = 0.d0
betay = 0.d0
betaz = 0.d0
end if
end subroutine GRHydro_ComovingShift
/*@@
@routine GRHydro_SetUpCoords
@date Fri Mar 14 19:11:13 2003
@author Ian Hawke
@desc
Initializes the coordinates that are evolved with the
comoving shift
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
subroutine GRHydro_SetUpCoords(CCTK_ARGUMENTS)
implicit none
DECLARE_CCTK_ARGUMENTS
GRHydro_x = x
GRHydro_y = y
GRHydro_z = z
end subroutine GRHydro_SetUpCoords
/*@@
@routine GRHydro_EvolveCoords
@date Wed Mar 19 12:04:20 2003
@author Ian Hawke
@desc
Evolve the coordinate system
@enddesc
@calls
@calledby
@history
@endhistory
@@*/
subroutine GRHydro_EvolveCoords(CCTK_ARGUMENTS)
implicit none
DECLARE_CCTK_ARGUMENTS
GRHydro_x_rhs = -betax
GRHydro_y_rhs = -betay
GRHydro_z_rhs = -betaz
end subroutine GRHydro_EvolveCoords
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