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C $Header: /u/gcmpack/MITgcm/pkg/shap_filt/shap_filt_computvort.F,v 1.4 2009/06/28 01:08:26 jmc Exp $ |
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C $Name: $ |
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|
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#include "SHAP_FILT_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: SHAP_FILT_COMPUTVORT |
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C !INTERFACE: |
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SUBROUTINE SHAP_FILT_COMPUTVORT( |
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I uFld, vFld, |
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O vort, |
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I k, bi,bj, myThid ) |
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | S/R SHAP_FILT_COMPUTVORT |
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C | o Calculate delta_i[vFld]-delta_j[uFld] |
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C *==========================================================* |
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C | o used in computational-mode filter to replace relative |
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C | vorticity |
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C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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|
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C == Global variables === |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "GRID.h" |
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#ifdef ALLOW_EXCH2 |
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#include "W2_EXCH2_SIZE.h" |
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#include "W2_EXCH2_TOPOLOGY.h" |
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#endif /* ALLOW_EXCH2 */ |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C == Routine arguments |
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C uFld :: velocity field (U component) on which filter applies |
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C vFld :: velocity field (V component) on which filter applies |
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C myThid :: Thread number for this instance of SHAP_FILT_UV_S2 |
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_RL uFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL vort(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER k, bi,bj |
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INTEGER myThid |
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|
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#ifdef ALLOW_SHAP_FILT |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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INTEGER i,j |
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_RS maskZ |
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LOGICAL northWestCorner, northEastCorner, |
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& southWestCorner, southEastCorner |
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INTEGER myFace |
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#ifdef ALLOW_EXCH2 |
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INTEGER myTile |
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#endif /* ALLOW_EXCH2 */ |
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CEOP |
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|
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#ifdef ALLOW_AUTODIFF |
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C- Initialisation : |
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DO j=1-OLy,sNy+OLy |
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DO i=1-OLx,sNx+OLx |
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vort(i,j)= 0. |
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ENDDO |
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ENDDO |
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#endif |
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|
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C- replace Physical calc Div & Vort by computational one : |
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DO j=2-OLy,sNy+OLy |
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DO i=2-OLx,sNx+OLx |
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vort(i,j) = ( vFld(i,j)-vFld(i-1,j) ) |
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& - ( uFld(i,j)-uFld(i,j-1) ) |
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maskZ = (maskW(i,j,k,bi,bj)+maskW(i,j-1,k,bi,bj)) |
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& *(maskS(i,j,k,bi,bj)+maskS(i-1,j,k,bi,bj)) |
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IF (maskZ.LT.1.) vort(i,j)=0. |
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ENDDO |
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ENDDO |
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|
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C- Special stuff for Cubed Sphere |
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IF (useCubedSphereExchange) THEN |
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#ifdef ALLOW_EXCH2 |
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myTile = W2_myTileList(bi,bj) |
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myFace = exch2_myFace(myTile) |
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southWestCorner = exch2_isWedge(myTile).EQ.1 |
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& .AND. exch2_isSedge(myTile).EQ.1 |
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southEastCorner = exch2_isEedge(myTile).EQ.1 |
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& .AND. exch2_isSedge(myTile).EQ.1 |
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northEastCorner = exch2_isEedge(myTile).EQ.1 |
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& .AND. exch2_isNedge(myTile).EQ.1 |
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northWestCorner = exch2_isWedge(myTile).EQ.1 |
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& .AND. exch2_isNedge(myTile).EQ.1 |
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#else |
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myFace = bi |
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southWestCorner = .TRUE. |
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southEastCorner = .TRUE. |
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northWestCorner = .TRUE. |
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northEastCorner = .TRUE. |
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#endif /* ALLOW_EXCH2 */ |
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C--- |
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IF ( southWestCorner ) THEN |
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i=1 |
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j=1 |
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maskZ = maskW(i,j,k,bi,bj)+maskW(i,j-1,k,bi,bj) |
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& +maskS(i,j,k,bi,bj) |
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IF (maskZ.GE.2.) THEN |
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vort(i,j)= |
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& (+vFld(i,j) -uFld(i,j) ) +uFld(i,j-1) |
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vort(i,j)=vort(i,j)*4. _d 0 / 3. _d 0 |
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ELSE |
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vort(i,j)=0. |
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ENDIF |
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ENDIF |
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C--- |
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IF ( southEastCorner ) THEN |
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i=sNx+1 |
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j=1 |
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maskZ = maskW(i,j,k,bi,bj)+maskW(i,j-1,k,bi,bj) |
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& +maskS(i-1,j,k,bi,bj) |
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IF (maskZ.GE.2.) THEN |
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IF ( myFace.EQ.2 ) THEN |
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vort(i,j)= |
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& (-uFld(i,j) -vFld(i-1,j) ) +uFld(i,j-1) |
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ELSEIF ( myFace.EQ.4 ) THEN |
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vort(i,j)= |
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& (-vFld(i-1,j) +uFld(i,j-1) ) -uFld(i,j) |
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ELSE |
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vort(i,j)= |
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& (+uFld(i,j-1) -uFld(i,j) ) -vFld(i-1,j) |
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ENDIF |
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vort(i,j)=vort(i,j)*4. _d 0 / 3. _d 0 |
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ELSE |
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vort(i,j)=0. |
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ENDIF |
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ENDIF |
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C--- |
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IF ( northWestCorner ) THEN |
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i=1 |
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j=sNy+1 |
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maskZ = maskW(i,j,k,bi,bj)+maskW(i,j-1,k,bi,bj) |
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& +maskS(i,j,k,bi,bj) |
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IF (maskZ.GE.2.) THEN |
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IF ( myFace.EQ.1 ) THEN |
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vort(i,j)= |
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& (+uFld(i,j-1) +vFld(i,j) ) -uFld(i,j) |
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ELSEIF ( myFace.EQ.3 ) THEN |
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vort(i,j)= |
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& (-uFld(i,j) +uFld(i,j-1) ) +vFld(i,j) |
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ELSE |
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vort(i,j)= |
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& (+vFld(i,j) -uFld(i,j) ) +uFld(i,j-1) |
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ENDIF |
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vort(i,j)=vort(i,j)*4. _d 0 / 3. _d 0 |
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ELSE |
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vort(i,j)=0. |
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ENDIF |
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ENDIF |
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C--- |
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IF ( northEastCorner ) THEN |
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i=sNx+1 |
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j=sNy+1 |
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maskZ = maskW(i,j,k,bi,bj)+maskW(i,j-1,k,bi,bj) |
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& +maskS(i-1,j,k,bi,bj) |
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IF (maskZ.GE.2.) THEN |
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IF ( MOD(myFace,2).EQ.1 ) THEN |
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vort(i,j)= |
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& (-uFld(i,j) -vFld(i-1,j) ) +uFld(i,j-1) |
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ELSE |
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vort(i,j)= |
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& (+uFld(i,j-1) -uFld(i,j) ) -vFld(i-1,j) |
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ENDIF |
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vort(i,j)=vort(i,j)*4. _d 0 / 3. _d 0 |
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ELSE |
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vort(i,j)=0. |
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ENDIF |
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ENDIF |
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C--- end if useCubedSphereExchange: |
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ENDIF |
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|
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c---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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#endif /* ALLOW_SHAP_FILT */ |
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|
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RETURN |
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END |
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