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mlosch |
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C $Header: $ |
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C $Name: $ |
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C $Id: ini_rhs.F,v 1.4 2009/11/17 02:41:49 cwolfe Exp $ |
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#include "CPP_OPTIONS.h" |
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CStartOfInterface |
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SUBROUTINE INI_RHS( |
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I cg2d_b, |
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O cg2d_x1, |
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O cg2d_x2, |
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I myThid) |
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C /==========================================================\ |
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C | SUBROUTINE INI_RHS | |
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C | o Initialise 2d conjugate gradient solver right-hand side| |
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C |==========================================================| |
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C | Set a source term b in Ax = b (1) | |
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C | We solve (1) with neumann bc's whic means that b must | |
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C | integrate out to zero over the whole domain. If b does | |
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C | not integrate out to zero then the solution will | |
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C | converge, but to a non-zero final residual. | |
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C \==========================================================/ |
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IMPLICIT NONE |
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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 "CG2D.h" |
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C === Routine arguments === |
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CEndOFInterface |
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C === Local variables === |
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C iG, jG - Global coordinate index |
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C faceArea - Temporary used to hold cell face areas. |
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C I,J,K - Loop counters |
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C iMid, jMid - Global coords of mid-point of model domain |
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INTEGER I, J |
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INTEGER bi, bj |
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INTEGER iG, jG |
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INTEGER iMid, jMid |
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INTEGER iQ, i3Q |
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INTEGER myThid |
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_RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL cg2d_x1(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL cg2d_x2(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL bsum, bsumTile(nSx,nSy) |
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_RL port_rand |
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INTEGER numPoints |
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C-- Get model global domain mid-point |
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iMid = Nx/2 |
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iQ = Nx/4 |
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i3Q = 3*Nx/4 |
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jMid = Ny/2 |
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C-- Set dummy source term for elliptic equation |
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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 J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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cg2d_b(I,J,bi,bj) = 0. _d 0 |
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cg2d_x1(I,J,bi,bj) = 0. _d 0 |
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cg2d_x2(I,J,bi,bj) = 0. _d 0 |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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C bsum = 0. _d 0 |
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C numPoints = NX*NY |
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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 bsumTile(bi,bj) = 0. _d 0 |
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DO J=1,sNy |
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DO I=1,sNx |
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cg2d_b(I,J,bi,bj) = 0. _d 0 |
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C-- Set +/-1 source function in middle of domain. |
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iG = myXGlobalLo + sNx*(bi-1) + I - 1 |
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jG = myYGlobalLo + sNy*(bj-1) + J - 1 |
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C write(*,'(i2,2i3,2i5,2x,a,2i5)')mythid,bi,bj,i,j,'iG, jG =',iG,jG |
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IF ( iG .EQ. Nx/2 .AND. jG .EQ. Ny/2 ) |
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& cg2d_b(I,J,bi,bj) = 1._d 0 |
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IF ( iG .EQ. Nx/2+1 .AND. jG .EQ. Ny/2 ) |
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& cg2d_b(I,J,bi,bj) = -1. _d 0 |
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C cg2d_b(I,J,bi,bj) = port_rand(-1.) |
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C bsumTile(bi,bj) = bsumTile(bi,bj) + cg2d_b(I,J,bi,bj) |
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ENDDO |
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ENDDO |
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ENDDO |
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ENDDO |
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C CALL GLOBAL_SUM_TILE_RL(bsumTile,bsum,myThid) |
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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 J=1,sNy |
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! DO I=1,sNx |
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! cg2d_b(I,J,bi,bj) = cg2d_b(I,J,bi,bj) - bsum/numPoints |
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! ENDDO |
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! ENDDO |
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! ENDDO |
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! ENDDO |
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C-- Update overlap regions synchronously |
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CALL EXCH_XY_RL(cg2d_b,myThid) |
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CALL EXCH_XY_RL(cg2d_x1,myThid) |
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CALL EXCH_XY_RL(cg2d_x2,myThid) |
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C |
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RETURN |
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END |
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