RFLU_ScalarFirst.F90

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!******************************************************************************
!
! Purpose: Compute first-order accurate discretization of scalar inviscid flux.
!
! Description: None.
!
! Input: 
!  pRegion              Pointer to region data
!  nVarScal             Number of scalar variables
!  cvScal               Conserved scalar variables
!  resScal              Residual due to central scalar fluxes
!
! Output: None.
!
! Notes: None.
!
!******************************************************************************
!
! $Id: RFLU_ScalarFirst.F90,v 1.4 2008/12/06 08:44:12 mtcampbe Exp $
!
! Copyright: (c) 2004 by the University of Illinois
!
!******************************************************************************

SUBROUTINE rflu_scalarfirst(pRegion,nVarScal,cvScal,resScal)

  USE moddatatypes
  USE modglobal, ONLY: t_global
  USE moddatastruct, ONLY: t_region
  USE modgrid, ONLY: t_grid
  USE moderror
  USE modparameters
    
  IMPLICIT NONE

! *****************************************************************************
! Definitions and declarations
! *****************************************************************************

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

  INTEGER, INTENT(IN) :: nvarscal
  REAL(RFREAL), DIMENSION(:,:), INTENT(IN) :: cvscal
  REAL(RFREAL), DIMENSION(:,:), INTENT(INOUT) :: resscal
  TYPE(t_region), POINTER :: pregion

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

  CHARACTER(CHRLEN) :: rcsidentstring
  INTEGER :: c1,c2,ifc,ivarscal
  REAL(RFREAL) :: flx,mf,mfn,mfp,sl,sr
  REAL(RFREAL), DIMENSION(:), POINTER :: pmf  
  TYPE(t_global), POINTER :: global
  TYPE(t_grid), POINTER :: pgrid

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

  rcsidentstring = '$RCSfile: RFLU_ScalarFirst.F90,v $ $Revision: 1.4 $'

  global => pregion%global

  CALL registerfunction(global,'RFLU_ScalarFirst',&
  'RFLU_ScalarFirst.F90')
  
! *****************************************************************************
! Checks: Defensive coding, should never occur
! *****************************************************************************
 
  IF ( pregion%mixtInput%indMfMixt /= 1 ) THEN 
    CALL errorstop(global,err_indmfmixt_invalid,__line__)
  END IF ! pRegion%mixtInput%indMfMixt

! *****************************************************************************
! Set dimensions and pointers 
! *****************************************************************************

  pgrid => pregion%grid
  pmf   => pregion%mixt%mfMixt

! *****************************************************************************
! Compute fluxes
! *****************************************************************************

  DO ifc = 1,pgrid%nFaces
    c1 = pgrid%f2c(1,ifc)
    c2 = pgrid%f2c(2,ifc) 

! =============================================================================  
!   Get mass flux 
! =============================================================================  

    mf  = pmf(ifc)
    mfp = max(mf,0.0_rfreal)
    mfn = min(mf,0.0_rfreal)
         
! =============================================================================  
!   Compute flux and accumulate into residual
! =============================================================================  
     
    DO ivarscal = 1,nvarscal
      sl = cvscal(ivarscal,c1) 
      sr = cvscal(ivarscal,c2) 
     
      flx = mfp*sl + mfn*sr

      resscal(ivarscal,c1) = resscal(ivarscal,c1) + flx
      resscal(ivarscal,c2) = resscal(ivarscal,c2) - flx
    END DO ! iVarScal
  END DO  ! ifc
  
! *****************************************************************************
! End
! *****************************************************************************

  CALL deregisterfunction(global)

END SUBROUTINE rflu_scalarfirst

!******************************************************************************
!
! RCS Revision history:
!
! $Log: RFLU_ScalarFirst.F90,v $
! Revision 1.4  2008/12/06 08:44:12  mtcampbe
! Updated license.
!
! Revision 1.3  2008/11/19 22:17:26  mtcampbe
! Added Illinois Open Source License/Copyright
!
! Revision 1.2  2006/04/07 15:19:16  haselbac
! Removed tabs
!
! Revision 1.1  2004/01/29 22:56:07  haselbac
! Initial revision
!
!******************************************************************************