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C $Header: /u/gcmpack/MITgcm/eesupp/src/fill_cs_corner_tr_rl.F,v 1.2 2005/11/05 01:07:30 jmc Exp $ |
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C $Name: $ |
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|
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_EEOPTIONS.h" |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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CBOP |
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C !ROUTINE: FILL_CS_CORNER_TR_RL |
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|
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C !INTERFACE: |
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SUBROUTINE FILL_CS_CORNER_TR_RL( |
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I fill4dirX, withSigns, |
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U trFld, |
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I bi,bj, myThid) |
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|
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C !DESCRIPTION: |
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C *==========================================================* |
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C | SUBROUTINE FILL_CS_CORNER_TR_RL |
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C | o Fill the corner-halo region of CS-grid, |
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C | for a tracer variable (center of grid cell) |
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C *==========================================================* |
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C | o the corner halo region is filled with valid values |
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C | in order to compute (later on) gradient in X or Y |
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C | direction, on a wide stencil. |
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C *==========================================================* |
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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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#ifdef ALLOW_EXCH2 |
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#include "W2_EXCH2_TOPOLOGY.h" |
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#include "W2_EXCH2_PARAMS.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 |
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C fill4dirX :: True = prepare for X direction calculations |
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C otherwise, prepare for Y direction |
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C withSigns :: True = account for sign of X & Y directions |
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C trFld :: tracer field array with empty corners to fill |
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C bi,bj :: tile indices |
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C myThid :: thread number |
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LOGICAL fill4dirX |
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LOGICAL withSigns |
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_RL trFld(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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INTEGER bi,bj |
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INTEGER myThid |
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|
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C i,j :: loop indices |
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C myTile :: tile number |
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INTEGER i,j |
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LOGICAL southWestCorner |
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LOGICAL southEastCorner |
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LOGICAL northWestCorner |
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LOGICAL northEastCorner |
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_RL negOne |
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#ifdef ALLOW_EXCH2 |
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INTEGER myTile |
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#endif |
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CEOP |
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|
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negOne = 1. |
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IF (withSigns) negOne = -1. |
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|
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IF (useCubedSphereExchange) THEN |
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|
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#ifdef ALLOW_EXCH2 |
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myTile = W2_myTileList(bi) |
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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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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 |
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|
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IF ( fill4dirX ) THEN |
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C-- Internal exchange for calculations in X |
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|
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C- For cube face corners we need to duplicate the |
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C- i-1 and i+1 values into the null space as follows: |
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C |
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C |
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C o NW corner: copy T( 0,sNy ) into T( 0,sNy+1) e.g. |
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C | |
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C x T(0,sNy+1) | |
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C /\ | |
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C --||------------|----------- |
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C || | |
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C x T(0,sNy) | x T(1,sNy) |
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C | |
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C |
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C o SW corner: copy T(0,1) into T(0,0) e.g. |
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C | |
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C x T(0,1) | x T(1,1) |
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C || | |
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C --||------------|----------- |
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C \/ | |
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C x T(0,0) | |
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C | |
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C |
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C o NE corner: copy T(sNx+1,sNy ) into T(sNx+1,sNy+1) e.g. |
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C | |
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C | x T(sNx+1,sNy+1) |
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C | /\ |
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C ----------------|--||------- |
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C | || |
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C x T(sNx,sNy) | x T(sNx+1,sNy ) |
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C | |
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C o SE corner: copy T(sNx+1,1 ) into T(sNx+1,0 ) e.g. |
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C | |
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C x T(sNx,1) | x T(sNx+1, 1) |
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C | || |
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C ----------------|--||------- |
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C | \/ |
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C | x T(sNx+1, 0) |
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IF ( southWestCorner ) THEN |
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DO j=1,OLy |
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DO i=1,OLx |
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trFld( 1-i , 1-j ) = negOne*trFld( 1-j , i ) |
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ENDDO |
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ENDDO |
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ENDIF |
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IF ( southEastCorner ) THEN |
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DO j=1,OLy |
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DO i=1,OLx |
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trFld(sNx+i, 1-j ) = negOne*trFld(sNx+j, i ) |
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ENDDO |
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ENDDO |
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ENDIF |
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IF ( northWestCorner ) THEN |
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DO j=1,OLy |
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DO i=1,OLx |
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trFld( 1-i ,sNy+j) = negOne*trFld( 1-j , sNy+1-i ) |
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ENDDO |
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ENDDO |
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ENDIF |
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IF ( northEastCorner ) THEN |
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DO j=1,OLy |
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DO i=1,OLx |
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trFld(sNx+i,sNy+j) = negOne*trFld(sNx+j, sNy+1-i ) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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C-- End of X direction ; start Y direction case. |
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|
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ELSE |
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C-- Internal exchange for calculations in Y |
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|
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C- For cube face corners we need to duplicate the |
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C- j-1 and j+1 values into the null space as follows: |
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C |
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C o SW corner: copy T(0,1) into T(0,0) e.g. |
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C | |
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C | x T(1,1) |
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C | |
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C ----------------|----------- |
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C | |
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C x T(0,0)<====== x T(1,0) |
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C | |
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C |
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C o NW corner: copy T( 0,sNy ) into T( 0,sNy+1) e.g. |
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C | |
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C x T(0,sNy+1)<=== x T(1,sNy+1) |
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C | |
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C ----------------|----------- |
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C | |
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C | x T(1,sNy) |
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C | |
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C |
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C o NE corner: copy T(sNx+1,sNy ) into T(sNx+1,sNy+1) e.g. |
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C | |
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C x T(sNx,sNy+1)=====>x T(sNx+1,sNy+1) |
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C | |
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C ----------------|----------- |
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C | |
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C x T(sNx,sNy) | |
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C | |
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C o SE corner: copy T(sNx+1,1 ) into T(sNx+1,0 ) e.g. |
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C | |
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C x T(sNx,1) | |
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C | |
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C ----------------|----------- |
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C | |
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C x T(sNx,0) =====>x T(sNx+1, 0) |
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IF ( southWestCorner ) THEN |
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DO j=1,Oly |
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DO i=1,Olx |
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trFld( 1-i , 1-j ) = negOne*trFld( j , 1-i ) |
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ENDDO |
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ENDDO |
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ENDIF |
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IF ( southEastCorner ) THEN |
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DO j=1,Oly |
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DO i=1,Olx |
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trFld(sNx+i, 1-j ) = negOne*trFld(sNx+1-j, 1-i ) |
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ENDDO |
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ENDDO |
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ENDIF |
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IF ( northWestCorner ) THEN |
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DO j=1,Oly |
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DO i=1,Olx |
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trFld( 1-i ,sNy+j) = negOne*trFld( j ,sNy+i) |
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ENDDO |
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ENDDO |
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ENDIF |
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IF ( northEastCorner ) THEN |
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DO j=1,Oly |
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DO i=1,Olx |
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trFld(sNx+i,sNy+j) = negOne*trFld(sNx+1-j,sNy+i) |
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ENDDO |
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ENDDO |
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ENDIF |
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|
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C- End of Y direction case. |
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ENDIF |
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|
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C-- End useCubedSphereExchange |
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ENDIF |
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|
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RETURN |
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END |
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