DescaleGridSpeeds.F90

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!******************************************************************************
!
! Purpose: Descale grid speeds.
!
! Description: None. 
!
! Input: 
!   region     Pointer to region
!
! Output: None.
!
! Notes: 
!   1. Grid speeds need to be descaled because they are scaled during the 
!      Runge-Kutta stages, but for consistent restarts, they need to be 
!      written out consistent with their values when they were used for the 
!      time-step computation.
!
!******************************************************************************
!
! $Id: DescaleGridSpeeds.F90,v 1.3 2008/12/06 08:44:09 mtcampbe Exp $
!
! Copyright: (c) 2003 by the University of Illinois
!
!******************************************************************************

SUBROUTINE descalegridspeeds( region )

  USE moddatatypes
  USE modgrid, ONLY      : t_grid
  USE moddatastruct, ONLY: t_region
  USE modbndpatch, ONLY  : t_patch
  USE modglobal, ONLY    : t_global
  USE moderror
  USE modparameters
#ifdef RFLO
  USE modinterfaces, ONLY : rflo_getdimensdummynodes, rflo_getnodeoffset
#include "Indexing.h"
#endif
#ifdef RFLU
  USE rflu_modgrid
#endif

  IMPLICIT NONE

! *****************************************************************************
! Declarations and definitions
! *****************************************************************************

! =============================================================================
! Arguments
! =============================================================================

  TYPE(t_region) :: region

! =============================================================================
! Locals
! =============================================================================

  INTEGER :: ifc, ipatch, irk, irkstep
  REAL(RFREAL) :: scalefactor, term
  REAL(RFREAL) :: ark(5), grk(5)
#ifdef RFLO
  INTEGER :: ilev, idnbeg, idnend, jdnbeg, jdnend, kdnbeg, kdnend
  INTEGER :: ibn, ien, inoff, ijnoff, in
  REAL(RFREAL), POINTER :: sivel(:), sjvel(:), skvel(:)
#endif
#ifdef RFLU
  REAL(RFREAL), DIMENSION(:), POINTER :: gs
  TYPE(t_patch), POINTER :: ppatch
#endif
  TYPE(t_global), POINTER :: global

! *****************************************************************************
! Start
! *****************************************************************************

  global => region%global

  CALL registerfunction(global,'DescaleGridSpeeds',&
  'DescaleGridSpeeds.F90')
  
! *****************************************************************************
! Set pointers and variables
! *****************************************************************************

  irkstep = region%irkStep

  ark(:) = region%mixtInput%ark(:)
  grk(:) = region%mixtInput%grk(:)

! *****************************************************************************
! Descale grid speeds
! *****************************************************************************

! =============================================================================
! Determine scaling factor (compare with ScaleGridSpeeds.F90)
! ============================================================================= 

  term = 0.0_rfreal

  DO irk = 1,global%nrkSteps-1
    term = term + grk(irk)/ark(irk)
  END DO ! irk

  scalefactor = 1.0_rfreal/(1.0_rfreal/ark(global%nrkSteps) - term)

! =============================================================================
! Interior faces
! ============================================================================= 

#ifdef RFLO
  ilev = region%currLevel
  CALL rflo_getdimensdummynodes( region,ilev,idnbeg,idnend, &
                                 jdnbeg,jdnend,kdnbeg,kdnend )
  CALL rflo_getnodeoffset( region,ilev,inoff,ijnoff )
  ibn = indijk(idnbeg,jdnbeg,kdnbeg,inoff,ijnoff)
  ien = indijk(idnend,jdnend,kdnend,inoff,ijnoff)

  sivel => region%levels(ilev)%grid%siVel
  sjvel => region%levels(ilev)%grid%sjVel
  skvel => region%levels(ilev)%grid%skVel

  DO in=ibn,ien
    sivel(in) = scalefactor*sivel(in)
    sjvel(in) = scalefactor*sjvel(in)
    skvel(in) = scalefactor*skvel(in)
  ENDDO
#endif

#ifdef RFLU
  gs => region%grid%gs

  DO ifc = 1,region%grid%nFaces
    gs(ifc) = scalefactor*gs(ifc)
  END DO ! ifc

! =============================================================================
! Patch faces
! ============================================================================= 

  DO ipatch = 1,region%grid%nPatches
    ppatch => region%patches(ipatch)
    gs     => ppatch%gs

    DO ifc = 1,ppatch%nBFaces
      gs(ifc) = scalefactor*gs(ifc)      
    END DO ! ifc
  END DO ! iPatch
#endif

! *****************************************************************************
! End
! *****************************************************************************

  CALL deregisterfunction(global)

END SUBROUTINE descalegridspeeds

!******************************************************************************
!
! RCS Revision history:
!
! $Log: DescaleGridSpeeds.F90,v $
! Revision 1.3  2008/12/06 08:44:09  mtcampbe
! Updated license.
!
! Revision 1.2  2008/11/19 22:17:22  mtcampbe
! Added Illinois Open Source License/Copyright
!
! Revision 1.1  2004/12/01 16:48:29  haselbac
! Initial revision after changing case
!
! Revision 1.7  2003/11/20 16:40:35  mdbrandy
! Backing out RocfluidMP changes from 11-17-03
!
! Revision 1.4  2003/10/01 23:52:09  jblazek
! Corrected bug in moving noslip wall BC and grid speeds.
!
! Revision 1.3  2003/05/15 02:57:02  jblazek
! Inlined index function.
!
! Revision 1.2  2003/03/15 16:14:30  haselbac
! Changed loop limit
!
! Revision 1.1  2003/02/25 21:42:24  haselbac
! Initial revision
!
!******************************************************************************