| 1 |
C $Id: ini_rhs.F,v 1.1 2006/05/12 21:58:06 ce107 Exp $ |
| 2 |
CStartOfInterface |
| 3 |
SUBROUTINE INI_RHS |
| 4 |
C /==========================================================\ |
| 5 |
C | SUBROUTINE INI_RHS | |
| 6 |
C | o Initialise 2d conjugate gradient solver right-hand side| |
| 7 |
C |==========================================================| |
| 8 |
C | Set a source term b in Ax = b (1) | |
| 9 |
C | We solve (1) with neumann bc's whic means that b must | |
| 10 |
C | integrate out to zero over the whole domain. If b does | |
| 11 |
C | not integrate out to zero then the solution will | |
| 12 |
C | converge, but to a non-zero final residual. | |
| 13 |
C \==========================================================/ |
| 14 |
IMPLICIT NONE |
| 15 |
|
| 16 |
C === Global variables === |
| 17 |
#include "SIZE.h" |
| 18 |
#include "EEPARAMS.h" |
| 19 |
#include "PARAMS.h" |
| 20 |
#include "CG2D.h" |
| 21 |
|
| 22 |
C === Routine arguments === |
| 23 |
CEndOFInterface |
| 24 |
|
| 25 |
C === Local variables === |
| 26 |
C iG, jG - Global coordinate index |
| 27 |
C faceArea - Temporary used to hold cell face areas. |
| 28 |
C I,J,K - Loop counters |
| 29 |
C iMid, jMid - Global coords of mid-point of model domain |
| 30 |
INTEGER I, J |
| 31 |
INTEGER iG, jG |
| 32 |
INTEGER iMid, jMid |
| 33 |
INTEGER iQ, i3Q |
| 34 |
|
| 35 |
C-- Get model global domain mid-point |
| 36 |
iMid = Nx/2 |
| 37 |
iQ = Nx/4 |
| 38 |
i3Q = 3*Nx/4 |
| 39 |
jMid = Ny/2 |
| 40 |
|
| 41 |
C-- Set dummy source term for elliptic equation |
| 42 |
DO J=1-OLy,sNy+OLy |
| 43 |
DO I=1-OLx,sNx+OLx |
| 44 |
cg2d_b(I,J) = 0. _d 0 |
| 45 |
cg2d_x(I,J) = 0. _d 0 |
| 46 |
ENDDO |
| 47 |
ENDDO |
| 48 |
DO J=1,sNy |
| 49 |
DO I=1,sNx |
| 50 |
cg2d_x(I,J) = 0. _d 0 |
| 51 |
cg2d_b(I,J) = 0. _d 0 |
| 52 |
C-- Set +/-1 source function in middle of domain. |
| 53 |
iG = myXGlobalLo + I - 1 |
| 54 |
jG = myYGlobalLo + J - 1 |
| 55 |
IF ( iG .EQ. 1 .AND. jG .EQ. 1 ) cg2d_b(I,J) = 1. _d 0 |
| 56 |
IF ( iG .EQ. Nx .AND. jG .EQ. Ny ) cg2d_b(I,J) = -1. _d 0 |
| 57 |
ENDDO |
| 58 |
ENDDO |
| 59 |
C-- Update overlap regions synchronously |
| 60 |
CALL EXCH_XY_R8(cg2d_b) |
| 61 |
CALL EXCH_XY_R8(cg2d_x) |
| 62 |
C |
| 63 |
RETURN |
| 64 |
END |
| 65 |
|
Parent Directory
| 
Revision Log
| 
Revision Graph