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56 lines
1.7 KiB
56 lines
1.7 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 CONDNO (MXND, NODES, QRAT, SRAT, COND, SIDES, XN, YN,
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& LSIDE)
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C***********************************************************************
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C SUBROUTINE CONDNO = COMPUTES EVALUATOR FUNCTIONS FOR RESTRUCTURING
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C***********************************************************************
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C VARIABLES USED:
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C LSIDE = .TRUE. IF SIDES ARRAY IS TO BE FILLED
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C NODES = THE FOUR NODES OF THE ELEMENT
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C QRAT = THE RATIO OF SMALLEST TO LARGEST ANGLE
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C SRAT = THE RATIO OF SMALLEST TO LARGEST SIDE
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C COND = SRAT*QRAT
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C***********************************************************************
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DIMENSION NODES (4), SIDES (4), XN (MXND), YN (MXND)
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LOGICAL LSIDE
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N1 = NODES (1)
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N2 = NODES (2)
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N3 = NODES (3)
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N4 = NODES (4)
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SS1 = (XN (N1) - XN (N2)) **2 + (YN (N1) - YN (N2)) **2
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SS2 = (XN (N2) - XN (N3)) **2 + (YN (N2) - YN (N3)) **2
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SS3 = (XN (N3) - XN (N4)) **2 + (YN (N3) - YN (N4)) **2
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SS4 = (XN (N4) - XN (N1)) **2 + (YN (N4) - YN (N1)) **2
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AMAX = AMAX1 (SS1, SS3)
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AMIN = AMIN1 (SS1, SS3)
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BMAX = AMAX1 (SS2, SS4)
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BMIN = AMIN1 (SS2, SS4)
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IF (AMIN * BMIN .GT. 0.0) THEN
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SRAT = SQRT (SQRT (AMAX * BMAX / (AMIN * BMIN)))
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ELSE
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SRAT = 1.0E10
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ENDIF
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COND = QRAT * SRAT
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IF (LSIDE) THEN
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SIDES (1) = SQRT (SS1)
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SIDES (2) = SQRT (SS2)
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SIDES (3) = SQRT (SS3)
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SIDES (4) = SQRT (SS4)
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ENDIF
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RETURN
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END
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