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C $Id$ |
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CStartOfInterface |
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SUBROUTINE INI_CG2D |
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C /==========================================================\ |
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C | SUBROUTINE INI_CG2D | |
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C | o Initialise 2d conjugate gradient solver operators. | |
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C |==========================================================| |
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C | These arrays are purely a function of the basin geom. | |
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C | We set then here once and them use then repeatedly. | |
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C | In this example we hard code a periodic channel with a | |
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C | grid spacing on 1. | |
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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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C myThid - Thread no. that called this routine. |
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INTEGER myThid |
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CEndOfInterface |
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C === Local variables === |
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C xG, yG - Global coordinate location. |
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C zG |
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C iG, jG - Global coordinate index |
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C bi,bj - Loop counters |
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C faceArea - Temporary used to hold cell face areas. |
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C I,J,K |
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INTEGER I, J, K |
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INTEGER iG, jG |
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C-- Initialise laplace operator |
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C aW2d: integral Ax/dX |
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C aS2d: integral Ay/dY |
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DO J=1-OLy,sNy+OLy |
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DO I=1-OLx,sNx+OLx |
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iG = myXGlobalLo+I-1 |
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jG = myYGlobalLo+J-1 |
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aW2d(I,J) = 1. _d 0 |
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aS2d(I,J) = 1. _d 0 |
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IF ( jG .EQ. 1 .OR. jG .EQ. nY+1 ) THEN |
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aS2d(I,J) = 0. _d 0 |
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ENDIF |
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ENDDO |
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ENDDO |
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C CALL PLOT_FIELD_XYR8( aW2d, 'AW2D INI_CG2D') |
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C CALL PLOT_FIELD_XYR8( aS2d, 'AS2D INI_CG2D') |
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C-- Initialise preconditioner |
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DO J=1,sNy |
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DO I=1,sNx |
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pC(I,J) = 1. _d 0 |
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IF ( |
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& aW2d(I,J) + aW2d(I+1,J) |
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& +aS2d(I,J) + aS2D(I,J+1) |
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& .EQ. 0. _d 0 |
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& ) pC(I,J) = 0. _d 0 |
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pW(I,J) = 0. _d 0 |
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pS(I,J) = 0. _d 0 |
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1.1 |
ENDDO |
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ENDDO |
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C-- Update overlap regions |
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CALL EXCH_XY_R8(pC) |
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CALL EXCH_XY_R8(pW) |
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CALL EXCH_XY_R8(pS) |
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C-- Set default values for initial guess |
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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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ENDDO |
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ENDDO |
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C-- Update overlap regions |
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CALL EXCH_XY_R8(cg2d_x) |
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RETURN |
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END |
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