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79 lines
2.2 KiB
79 lines
2.2 KiB
2 years ago
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C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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SUBROUTINE SMOGS (MXND, XN, YN, NXL, LXN, NNN, NNNOLD, NIT, EPS,
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& RO)
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C***********************************************************************
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C SUBROUTINE SMOGS = MESH SMOOTHING BY LAPLACE-S USING GAUSS-SEIDEL
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C***********************************************************************
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C VARIABLES USED:
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C NIT = THE MAX NUMBER OF ITERATIONS TO DO.
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C EPS = MINIMUM DISTANCE NODES MUST MOVE TO CONTINUE ITERATIONS
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C RO = AN UNDER- OR OVER-RELAXATION FACTOR (NORMALLY 1.0)
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C***********************************************************************
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DIMENSION LINES(20)
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DIMENSION LXN(4, MXND), NXL(2, 3*MXND), XN(MXND), YN(MXND)
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LOGICAL BIG, ERR
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IF (RO .LT. 0.01) RO = 1.
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EPS2 = (EPS*RO)**2
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C ITERATION LOOP
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DO 120 IT = 1, NIT
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BIG = .FALSE.
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C NODE LOOP
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DO 110 NODE = NNNOLD + 1, NNN
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C SKIP CONTINUATION AND BOUNDARY LINES
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IF ((LXN(1, NODE) .GT. 0) .AND. (LXN(2, NODE) .GT. 0)) THEN
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C SUM COORDINATES OF ALL NEIGHBORING NODES
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SUMX = 0.0
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SUMY = 0.0
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CALL GETLXN (MXND, LXN, NODE, LINES, KOUNT, ERR)
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C IGNORE ERR BECAUSE IT IS ALREADY TAKEN CARE OF IN THE SKIP
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DO 100 IL = 1, KOUNT
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L = LINES(IL)
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IM = NXL(1, L) + NXL(2, L) - NODE
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SUMX = SUMX + XN(IM)
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SUMY = SUMY + YN(IM)
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100 CONTINUE
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C REDEFINE THIS NODE - S COORDINATES
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SUMX = SUMX/DBLE(KOUNT)
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SUMY = SUMY/DBLE(KOUNT)
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XDEL = RO*(SUMX - XN(NODE))
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YDEL = RO*(SUMY - YN(NODE))
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XN(NODE) = XN(NODE) + XDEL
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YN(NODE) = YN(NODE) + YDEL
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C CHECK FOR CONVERGENCE
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IF ((XDEL*XDEL + YDEL*YDEL) .GT. EPS2) BIG = .TRUE.
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ENDIF
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110 CONTINUE
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C IF NO SIGNIFICANT MOVEMENTS OCCURRED, RETURN
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IF (.NOT.BIG) RETURN
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120 CONTINUE
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RETURN
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END
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