source: LMDZ6/trunk/libf/dyn3d/dissip.f90 @ 5248

!
! $Id: dissip.f90 5246 2024-10-21 12:58:45Z abarral $
!
SUBROUTINE dissip( vcov,ucov,teta,p, dv,du,dh )
  !
  USE comconst_mod, ONLY: dtdiss

  IMPLICIT NONE


  ! ..  Avec nouveaux operateurs star :  gradiv2 , divgrad2, nxgraro2  ...
                              ! (  10/01/98  )

  !=======================================================================
  !
  !   Auteur:  P. Le Van
  !   -------
  !
  !   Objet:
  !   ------
  !
  !   Dissipation horizontale
  !
  !=======================================================================
  !-----------------------------------------------------------------------
  !   Declarations:
  !   -------------

  include "dimensions.h"
  include "paramet.h"
  include "comgeom.h"
  include "comdissnew.h"
  include "comdissipn.h"

  !   Arguments:
  !   ----------

  REAL,INTENT(IN) :: vcov(ip1jm,llm) ! covariant meridional wind
  REAL,INTENT(IN) :: ucov(ip1jmp1,llm) ! covariant zonal wind
  REAL,INTENT(IN) :: teta(ip1jmp1,llm) ! potential temperature
  REAL,INTENT(IN) :: p(ip1jmp1,llmp1) ! pressure
  ! ! tendencies (.../s) on covariant winds and potential temperature
  REAL,INTENT(OUT) :: dv(ip1jm,llm)
  REAL,INTENT(OUT) :: du(ip1jmp1,llm)
  REAL,INTENT(OUT) :: dh(ip1jmp1,llm)

  !   Local:
  !   ------

  REAL :: gdx(ip1jmp1,llm),gdy(ip1jm,llm)
  REAL :: grx(ip1jmp1,llm),gry(ip1jm,llm)
  REAL :: te1dt(llm),te2dt(llm),te3dt(llm)
  REAL :: deltapres(ip1jmp1,llm)

  INTEGER :: l,ij

  REAL :: SSUM

  !-----------------------------------------------------------------------
  !   initialisations:
  !   ----------------

  DO l=1,llm
     te1dt(l) = tetaudiv(l) * dtdiss
     te2dt(l) = tetaurot(l) * dtdiss
     te3dt(l) = tetah(l)    * dtdiss
  ENDDO
  du=0.
  dv=0.
  dh=0.

  !-----------------------------------------------------------------------
  !   Calcul de la dissipation:
  !   -------------------------

  !   Calcul de la partie   grad  ( div ) :
  !   -------------------------------------


  IF(lstardis) THEN
     CALL gradiv2( llm,ucov,vcov,nitergdiv,gdx,gdy )
  ELSE
     CALL gradiv ( llm,ucov,vcov,nitergdiv,gdx,gdy )
  ENDIF

  DO l=1,llm

     DO ij = 1, iip1
        gdx(     ij ,l) = 0.
        gdx(ij+ip1jm,l) = 0.
     ENDDO

     DO ij = iip2,ip1jm
        du(ij,l) = du(ij,l) - te1dt(l) *gdx(ij,l)
     ENDDO
     DO ij = 1,ip1jm
        dv(ij,l) = dv(ij,l) - te1dt(l) *gdy(ij,l)
     ENDDO

   ENDDO

  !   calcul de la partie   n X grad ( rot ):
  !   ---------------------------------------

  IF(lstardis) THEN
     CALL nxgraro2( llm,ucov, vcov, nitergrot,grx,gry )
  ELSE
     CALL nxgrarot( llm,ucov, vcov, nitergrot,grx,gry )
  ENDIF


  DO l=1,llm
     DO ij = 1, iip1
        grx(ij,l) = 0.
     ENDDO

     DO ij = iip2,ip1jm
        du(ij,l) = du(ij,l) - te2dt(l) * grx(ij,l)
     ENDDO
     DO ij =  1, ip1jm
        dv(ij,l) = dv(ij,l) - te2dt(l) * gry(ij,l)
     ENDDO
  ENDDO

  !   calcul de la partie   div ( grad ):
  !   -----------------------------------


  IF(lstardis) THEN

   DO l = 1, llm
      DO ij = 1, ip1jmp1
        deltapres(ij,l) = AMAX1( 0.,  p(ij,l) - p(ij,l+1) )
      ENDDO
   ENDDO

     CALL divgrad2( llm,teta, deltapres  ,niterh, gdx )
  ELSE
     CALL divgrad ( llm,teta, niterh, gdx        )
  ENDIF

  DO l = 1,llm
     DO ij = 1,ip1jmp1
        dh( ij,l ) = dh( ij,l ) - te3dt(l) * gdx( ij,l )
     ENDDO
  ENDDO

  RETURN
END SUBROUTINE dissip