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jmc |
1.4 |
C $Header: /u/gcmpack/MITgcm/pkg/exch2/exch_uv_agrid_xy_rx.template,v 1.3 2004/09/07 17:29:14 edhill Exp $ |
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C $Name: $ |
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#include "PACKAGES_CONFIG.h" |
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molod |
1.1 |
#include "CPP_EEOPTIONS.h" |
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jmc |
1.4 |
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SUBROUTINE EXCH_UV_AGRID_XY_RX( component1,component2, myThid ) |
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molod |
1.1 |
implicit none |
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C*=====================================================================* |
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jmc |
1.4 |
C Purpose: subroutine exch_uv_agrid_xyz_RX will |
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molod |
1.1 |
C handle exchanges for a 2D vector field on an A-grid. |
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C |
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C Input: component1(lon,lat,bi,bj) - first component of vector |
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C component2(lon,lat,bi,bj) - second component of vector |
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C myThid - tile number |
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C |
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C Output: component1 and component2 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) This code, as written, only works on ONE PROCESSOR! |
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C 2) This code assumes that the faces are square (sNx=sNy....) |
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edhill |
1.3 |
C (also - we do not worry about barriers) |
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molod |
1.1 |
C*=====================================================================* |
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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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edhill |
1.2 |
#include "EXCH.h" |
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molod |
1.1 |
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C == Argument list variables == |
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_RX component1(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RX component2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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INTEGER myThid |
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C == Local variables == |
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C i,j,L,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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C b[nsew] - indices of the [nswe] neighboring faces for each face. |
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integer i,j,L,bi,bj |
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integer OLw, OLe, OLn, OLs, exchWidthX, exchWidthY, myNz |
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_RX dummy1(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RX dummy2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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jmc |
1.4 |
#ifdef ALLOW_EXCH2 |
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CALL EXCH2_UV_AGRID_XY_RX( component1,component2, myThid ) |
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RETURN |
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#endif |
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molod |
1.1 |
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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myNz = 1 |
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C First call the exchanges for the two components |
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if (useCubedSphereExchange) then |
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call exch_RX_cube( component1, |
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. OLw, OLe, OLs, OLn, myNz, |
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. exchWidthX, exchWidthY, |
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. FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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call exch_RX_cube( component2, |
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. OLw, OLe, OLs, OLn, myNz, |
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. exchWidthX, exchWidthY, |
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. FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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else |
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call exch_RX( component1, |
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. OLw, OLe, OLs, OLn, myNz, |
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. exchWidthX, exchWidthY, |
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. FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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call exch_RX( component2, |
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. OLw, OLe, OLs, OLn, myNz, |
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. exchWidthX, exchWidthY, |
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. FORWARD_SIMULATION, EXCH_UPDATE_CORNERS, myThid ) |
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endif |
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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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if (useCubedSphereExchange) then |
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do bj = myByLo(myThid), myByHi(myThid) |
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do bi = myBxLo(myThid), myBxHi(myThid) |
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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,bi,bj) = component1(i,j,bi,bj) |
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dummy2(i,j,bi,bj) = component2(i,j,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 |
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component1(sNx+i,j,bi,bj) = dummy1(sNx+i,j,bi,bj) |
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component2(sNx+i,j,bi,bj) = dummy2(sNx+i,j,bi,bj) |
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C west |
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component1(i-OLx,j,bi,bj) = dummy2(i-OLx,j,bi,bj) |
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component2(i-OLx,j,bi,bj) = -dummy1(i-OLx,j,bi,bj) |
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C north |
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component1(j,sNy+i,bi,bj) = -dummy2(j,sNy+i,bi,bj) |
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component2(j,sNy+i,bi,bj) = dummy1(j,sNy+i,bi,bj) |
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C south |
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component1(j,i-OLx,bi,bj) = dummy1(j,i-OLx,bi,bj) |
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component2(j,i-OLx,bi,bj) = dummy2(j,i-OLx,bi,bj) |
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enddo |
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enddo |
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C now the even faces (share disposition of all sections of the halo) |
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elseif ( mod(bi,2).eq.0 ) then |
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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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component1(sNx+i,j,bi,bj) = dummy2(sNx+i,j,bi,bj) |
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component2(sNx+i,j,bi,bj) = -dummy1(sNx+i,j,bi,bj) |
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C west |
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component1(i-OLx,j,bi,bj) = dummy1(i-OLx,j,bi,bj) |
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component2(i-OLx,j,bi,bj) = dummy2(i-OLx,j,bi,bj) |
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C north |
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component1(j,sNy+i,bi,bj) = dummy1(j,sNy+i,bi,bj) |
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component2(j,sNy+i,bi,bj) = dummy2(j,sNy+i,bi,bj) |
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C south |
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component1(j,i-OLy,bi,bj) = -dummy2(j,i-OLy,bi,bj) |
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component2(j,i-OLy,bi,bj) = dummy1(j,i-OLy,bi,bj) |
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enddo |
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enddo |
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endif |
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enddo |
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enddo |
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endif |
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RETURN |
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END |
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jmc |
1.4 |
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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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