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ce107 |
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C $Id: ini_rhs.F,v 1.1 2006/05/12 21:58:06 ce107 Exp $ |
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ce107 |
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CStartOfInterface |
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SUBROUTINE INI_RHS |
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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 iG, jG |
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INTEGER iMid, jMid |
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INTEGER iQ, i3Q |
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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 J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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cg2d_b(I,J) = 0. _d 0 |
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cg2d_x(I,J) = 0. _d 0 |
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ENDDO |
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ENDDO |
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DO J=1,sNy |
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DO I=1,sNx |
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cg2d_x(I,J) = 0. _d 0 |
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cg2d_b(I,J) = 0. _d 0 |
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C-- Set +/-1 source function in middle of domain. |
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iG = myXGlobalLo + I - 1 |
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jG = myYGlobalLo + J - 1 |
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IF ( iG .EQ. 1 .AND. jG .EQ. 1 ) cg2d_b(I,J) = 1. _d 0 |
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IF ( iG .EQ. Nx .AND. jG .EQ. Ny ) cg2d_b(I,J) = -1. _d 0 |
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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_R8(cg2d_b) |
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CALL EXCH_XY_R8(cg2d_x) |
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C |
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RETURN |
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END |
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