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C $Header: /u/gcmpack/models/MITgcmUV/model/inc/CG2D.h,v 1.3 1998/07/16 16:59:27 cnh Exp $ |
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C |
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C /==========================================================\ |
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C | CG2D.h | |
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C | o Two-dimensional conjugate gradient solver header. | |
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C |==========================================================| |
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C | The common blocks set up here are used in the elliptic | |
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C | equation inversion. They are also used as the interface | |
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C | to the rest of the model. To set the source term for the | |
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C | solver set the appropriate array below. To read the | |
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C | solution read from the appropriate array below. | |
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C \==========================================================/ |
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C-- COMMON /CG2D_R/ DEL**2 Laplacian operators |
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C aW2d - East-west operator. |
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C aS2d - North-south operator. |
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C pW - East-west off-diagonal term of preconditioner. |
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C pS - North-south off-diagonal term of preconditioner. |
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C pC - Main diagonal term of preconditioner. |
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C etaNBuf - Shared buffers for accumulating con. grad vector product. |
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C alphaBuf |
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C errBuf |
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C nrmBuf |
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C cg2dNorm - A matrix normalisation factor. |
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COMMON /CG2D_R/ |
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& aW2d, |
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& aS2d, |
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& pW, pS, pC, |
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& errBuf, nrmBuf, etaNbuf, etaNM1Buf, alphaBuf, sumRhsBuf, |
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& cg2dNorm, rhsMaxBuf, cg2dNBuf |
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_RS aW2d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RS aS2d (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RS pW (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RS pS (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RS pC (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL etaNBuf(lShare8,MAX_NO_THREADS) |
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_RL etaNM1Buf(lShare8,MAX_NO_THREADS) |
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_RL alphaBuf(lShare8,MAX_NO_THREADS) |
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_RL errBuf(lShare8,MAX_NO_THREADS) |
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_RL nrmBuf(lShare8,MAX_NO_THREADS) |
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_RL sumRHSBuf(lShare8,MAX_NO_THREADS) |
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_RS cg2dNBuf(lShare8,MAX_NO_THREADS) |
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_RL rhsMaxBuf(lShare8,MAX_NO_THREADS) |
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_RL cg2dNorm |
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|
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C-- COMMON /CG2D_WK_R/ Work array common block |
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C cg2d_q - Intermediate matrix-vector product term |
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C cg2d_r - " |
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C cg2d_s - " |
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C cg2d_x Solution vector |
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C cg2d_b Right-hand side vector |
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COMMON /CG2D_WK_R/ |
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& cg2d_b, cg2d_q, cg2d_r, cg2d_s, cg2d_x |
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_RL cg2d_q(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL cg2d_r(1-1:sNx+1,1-1:sNy+1,nSx,nSy) |
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_RL cg2d_s(1-1:sNx+1,1-1:sNy+1,nSx,nSy) |
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_RL cg2d_x(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL cg2d_b(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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