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jmc |
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C $Header: /u/gcmpack/MITgcm/eesupp/src/exch_uv_agrid_xyz_rx.template,v 1.6 2004/11/19 02:32:05 jmc Exp $ |
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C $Name: $ |
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#include "PACKAGES_CONFIG.h" |
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#include "CPP_EEOPTIONS.h" |
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CBOP |
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C !ROUTINE: EXCH_UV_AGRID_3D_RX |
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C !INTERFACE: |
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SUBROUTINE EXCH_UV_AGRID_3D_RX( |
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U Uphi, Vphi, |
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I withSigns, myNz, myThid ) |
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C !DESCRIPTION: |
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C*=====================================================================* |
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C Purpose: SUBROUTINE EXCH_UV_AGRID_3D_RX |
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C handle exchanges for a 3D vector field on an A-grid. |
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C |
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C Input: |
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C Uphi(lon,lat,levs,bi,bj) :: first component of vector |
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C Vphi(lon,lat,levs,bi,bj) :: second component of vector |
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C withSigns (logical) :: true to use signs of components |
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C myNz :: 3rd dimension of input arrays Uphi,Vphi |
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C myThid :: my Thread Id number |
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C |
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C Output: Uphi and Vphi are updated (halo regions filled) |
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C |
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C Calls: exch (either exch_rx_cube or exch_rx) - twice, once |
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C for the first-component, once for second. |
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C |
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C NOTES: 1) If using CubedSphereExchange, only works on ONE PROCESSOR! |
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C*=====================================================================* |
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C !USES: |
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IMPLICIT NONE |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "EESUPPORT.h" |
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#include "EXCH.h" |
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C !INPUT/OUTPUT PARAMETERS: |
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C == Argument list variables == |
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INTEGER myNz |
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_RX Uphi(1-OLx:sNx+OLx,1-OLy:sNy+OLy,myNz,nSx,nSy) |
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_RX Vphi(1-OLx:sNx+OLx,1-OLy:sNy+OLy,myNz,nSx,nSy) |
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LOGICAL withSigns |
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INTEGER myThid |
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C !LOCAL VARIABLES: |
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C == Local variables == |
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C i,j,k,bi,bj :: are DO indices. |
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C OL[wens] :: Overlap extents in west, east, north, south. |
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C exchWidth[XY] :: Extent of regions that will be exchanged. |
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C dummy[12] :: copies of the vector components with haloes filled. |
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INTEGER i,j,k,bi,bj |
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INTEGER OLw, OLe, OLn, OLs, exchWidthX, exchWidthY |
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_RX dummy1(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RX dummy2(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RX negOne |
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#ifdef ALLOW_EXCH2 |
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CALL EXCH2_UV_AGRID_3D_RX( |
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U Uphi, Vphi, |
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I withSigns, Nr, myThid ) |
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RETURN |
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#endif |
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OLw = OLx |
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OLe = OLx |
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OLn = OLy |
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OLs = OLy |
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exchWidthX = OLx |
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exchWidthY = OLy |
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negOne = 1. |
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IF (withSigns) negOne = -1. |
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IF (useCubedSphereExchange) THEN |
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C--- using CubedSphereExchange: |
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C First call the exchanges for the two components |
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CALL EXCH_RX_CUBE( Uphi, |
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I OLw, OLe, OLs, OLn, myNz, |
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I exchWidthX, exchWidthY, |
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I FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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CALL EXCH_RX_CUBE( Vphi, |
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I OLw, OLe, OLs, OLn, myNz, |
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I exchWidthX, exchWidthY, |
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I FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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C Then if we are on the sphere we may need to switch u and v components |
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C and/or the signs depending on which cube face we are located. |
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C-- Loops on tile and level indices: |
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DO bj = myByLo(myThid), myByHi(myThid) |
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DO bi = myBxLo(myThid), myBxHi(myThid) |
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DO k = 1,Nr |
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C First we need to copy the component info into dummy arrays |
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DO j = 1-OLy,sNy+OLy |
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DO i = 1-OLx,sNx+OLx |
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dummy1(i,j) = Uphi(i,j,k,bi,bj) |
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dummy2(i,j) = Vphi(i,j,k,bi,bj) |
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ENDDO |
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ENDDO |
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C Now choose what to do at each edge of the halo based on which face |
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C (we assume that bj is always=1) |
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C odd faces share disposition of all sections of the halo |
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IF ( MOD(bi,2).EQ.1 ) THEN |
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DO j = 1,sNy |
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DO i = 1,exchWidthX |
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C east (nothing to change) |
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c Uphi(sNx+i,j,k,bi,bj) = dummy1(sNx+i,j) |
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c Vphi(sNx+i,j,k,bi,bj) = dummy2(sNx+i,j) |
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C west |
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Uphi(1-i,j,k,bi,bj) = dummy2(1-i,j) |
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Vphi(1-i,j,k,bi,bj) = dummy1(1-i,j)*negOne |
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ENDDO |
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ENDDO |
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DO j = 1,exchWidthY |
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DO i = 1,sNx |
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C north |
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Uphi(i,sNy+j,k,bi,bj) = dummy2(i,sNy+j)*negOne |
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Vphi(i,sNy+j,k,bi,bj) = dummy1(i,sNy+j) |
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C south (nothing to change) |
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c Uphi(i,1-j,k,bi,bj) = dummy1(i,1-j) |
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c Vphi(i,1-j,k,bi,bj) = dummy2(i,1-j) |
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ENDDO |
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ENDDO |
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ELSE |
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C now the even faces (share disposition of all sections of the halo) |
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DO j = 1,sNy |
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DO i = 1,exchWidthX |
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C east |
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Uphi(sNx+i,j,k,bi,bj) = dummy2(sNx+i,j) |
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Vphi(sNx+i,j,k,bi,bj) = dummy1(sNx+i,j)*negOne |
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C west (nothing to change) |
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c Uphi(1-i,j,k,bi,bj) = dummy1(1-i,j) |
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c Vphi(1-i,j,k,bi,bj) = dummy2(1-i,j) |
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ENDDO |
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ENDDO |
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DO j = 1,exchWidthY |
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DO i = 1,sNx |
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C north (nothing to change) |
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c Uphi(i,sNy+j,k,bi,bj) = dummy1(i,sNy+j) |
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c Vphi(i,sNy+j,k,bi,bj) = dummy2(i,sNy+j) |
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C south |
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Uphi(i,1-j,k,bi,bj) = dummy2(i,1-j)*negOne |
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Vphi(i,1-j,k,bi,bj) = dummy1(i,1-j) |
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ENDDO |
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ENDDO |
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C end odd / even faces |
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ENDIF |
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C-- end of Loops on tile and level indices (k,bi,bj). |
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ENDDO |
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ENDDO |
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ENDDO |
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ELSE |
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C--- not using CubedSphereExchange: |
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CALL EXCH_RX( Uphi, |
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I OLw, OLe, OLs, OLn, myNz, |
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I exchWidthX, exchWidthY, |
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I FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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CALL EXCH_RX( Vphi, |
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I OLw, OLe, OLs, OLn, myNz, |
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I exchWidthX, exchWidthY, |
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I FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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C--- using or not using CubedSphereExchange: end |
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ENDIF |
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RETURN |
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END |
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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CEH3 ;;; Local Variables: *** |
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CEH3 ;;; mode:fortran *** |
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CEH3 ;;; End: *** |
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