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/*@@
@file GRHydro_SlopeLimiter.F90
@date Sat Jan 26 02:00:32 2002
@author
@desc
The routine for the more complex slope limiters.
See Toros book for most of these.
@enddesc
@@*/
#include "cctk.h"
#include "cctk_Arguments.h"
#include "cctk_Parameters.h"
#include "cctk_Functions.h"
/*@@
@routine slopelimiter
@date Sat Jan 26 02:01:15 2002
@author Luca Baiotti, Ian Hawke
@desc
Given the slope delta and the ratio of the two local slopes,
limit the slope so the reconstruction is TVD.
@enddesc
@calls
@calledby
@history
Original minmod from GR3D, author Mark Miller. Other limiters from
codes of Hawke, Nikiforakis and Toro.
@endhistory
@@*/
subroutine slopelimiter(r, delta)
USE GRHydro_Scalars
implicit none
DECLARE_CCTK_FUNCTIONS
CCTK_REAL :: phi, r, denor, phir, delta
denor = 1.d0 + r
phir = 2.d0/denor
if (MC1) then
if (r > 0.d0) then
phi = min( 2.d0*r/(1.d0+r), phir )
else
phi = 0.d0
end if
!!$ else if (MC2) then
!!$
!!$ if (r > 3.d0) then
!!$ phi = 2*phir
!!$ else if (r > 1.d0/3.d0) then
!!$ phi = 1
!!$ else if (r > 0) then
!!$ phi = 2*r*phir
!!$ else
!!$ phi = 0.d0
!!$ end if
else if (MINMOD2) then
if (r > 1.d0) then
phi = min(1.d0, phir )
else if (r > 0.d0) then
phi = r
else
phi = 0.d0
end if
else if (MINMOD3) then
if (r > 0.d0) then
phi = min(1.d0, 4.d0/(1.d0+r) )
else
phi = 0.d0
end if
else if (SUPERBEE) then
if (r > 1.d0) then
phi = min(2.d0, r, 2.d0 / (1.d0 + r))
else if (r > 0.5d0) then
phi = 1.d0
else if (r > 0.d0) then
phi = 2.d0 * r
else
phi = 0.d0
end if
else
call CCTK_WARN(0, "Type of limiter not recognized")
end if
delta = delta * phi
end subroutine slopelimiter
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