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139 lines
4.0 KiB
139 lines
4.0 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 RESTA (MXND, XN, YN, NUID, LXK, KXL, NXL, LXN, KKK,
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& KKKOLD, NAVAIL, IAVAIL, NNN, LIMIT, IREST, TILT, ERR, NOROOM)
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C************************************************************************
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C SUBROUTINE RESTA = RESTRUCTURES THE MESH TO ELIMINATE WORST ELELMENTS
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C***********************************************************************
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C NOTE:
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C A RECORD IS KEPT OF UP TO 25 OF THE CURRENT WORST CONDITION NUMBERS
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C AND THE WORST ELEMENT POSSIBLE IS RESTRUCTURED
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C UNTIL NO FURTHER RESTRUCTURING CAN BE DONE.
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C***********************************************************************
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DIMENSION KCND(26), CND(26)
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DIMENSION NXL(2, 3*MXND), XN(MXND), YN(MXND), NUID(MXND)
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DIMENSION LXK(4, MXND), KXL(2, 3*MXND), LXN(4, MXND)
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DIMENSION NODES(4), ANGLES(4), SIDES(4)
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LOGICAL ERR, NOROOM, LSIDE, CCW, CAREA, DONE
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ERR = .FALSE.
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C CHECK FOR IMPENDING OVERFLOW
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IF (NAVAIL .LE. 1) THEN
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NOROOM = .TRUE.
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CALL MESSAGE('INSUFFICIENT STORAGE AVAILABLE IN RESTA')
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RETURN
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ENDIF
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C INITIALIZE
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NTAB = 0
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MAXTAB = 25
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CNDTOL = 2.0
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ASUM = 0.
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NSUM = 0
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CCW = .TRUE.
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CAREA = .FALSE.
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IREST = 0
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DO 110 K = KKKOLD + 1, KKK
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IF (LXK(1, K) .GT. 0) THEN
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LSIDE = .FALSE.
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C GET THE ELEMENTS COND VALUE (BASED ON ANGLE AND SIDE LENGTH)
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CALL GNXKA (MXND, XN, YN, K, NODES, AREA, LXK, NXL, CCW)
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CALL QAAVAL (MXND, NODES, ANGLES, QRAT, DUMMY, XN, YN,
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& CAREA)
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CALL CONDNO (MXND, NODES, QRAT, SRAT, COND, SIDES, XN, YN,
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& LSIDE)
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C ADD UP THE NUMBER OF ANGLES < PI/2
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DO 100 I = 1, 4
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IF (ANGLES(I) .LE. 1.58) THEN
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ASUM = ASUM + ANGLES(I)
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NSUM = NSUM + 1
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ENDIF
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100 CONTINUE
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C ADD BAD ELEMENTS TO THE LIST
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IF (COND .GE. CNDTOL) THEN
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CND(NTAB + 1) = COND
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KCND(NTAB + 1) = K
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CALL BUBBLE (CND, KCND, NTAB, NTAB + 1)
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NTAB = MIN0(NTAB + 1, MAXTAB)
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ENDIF
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ENDIF
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110 CONTINUE
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C TILT IS THE AVERAGE VALUE IN DEGREES OF ANGLES < PI/2
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IF (NSUM .GT. 0) THEN
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TILT = (ASUM/DBLE(NSUM))*57.2957795
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ELSE
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TILT = 90.
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ENDIF
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IF ((LIMIT .LE. 0) .OR. (NTAB .LE. 0)) RETURN
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CNDTOL = CND(NTAB)
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C TRY TO RESTRUCTURE ON THE 10 WORST ELEMENTS ONLY
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120 CONTINUE
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NTRY = MIN0(NTAB, 10)
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DO 130 IK = 1, NTRY
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IK1 = IK
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CALL RESTRY (MXND, KCND(IK), K2, LXK, NXL, KXL, LXN, XN, YN,
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& NUID, NAVAIL, IAVAIL, NNN, DONE, ERR, NOROOM)
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IF (ERR) RETURN
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IF (DONE) GO TO 140
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130 CONTINUE
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RETURN
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140 CONTINUE
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IREST = IREST + 1
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IF (IREST .GE. LIMIT) RETURN
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C UPDATE THE TABLE (AFTER 1 RESTRUCTURE)
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CALL GNXKA (MXND, XN, YN, KCND(IK1), NODES, AREA, LXK, NXL, CCW)
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CALL QAAVAL (MXND, NODES, ANGLES, QRAT, DUMMY, XN, YN, CAREA)
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CALL CONDNO (MXND, NODES, QRAT, SRAT, COND1, SIDES, XN, YN, LSIDE)
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CND(IK1) = COND1
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DO 150 IK = 1, NTAB
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IK2 = IK
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IF (KCND(IK) .EQ. K2) GO TO 160
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150 CONTINUE
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IK2 = NTAB + 1
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NTAB = NTAB + 1
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160 CONTINUE
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CALL GNXKA (MXND, XN, YN, K2, NODES, AREA, LXK, NXL, CCW)
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CALL QAAVAL (MXND, NODES, ANGLES, QRAT, DUMMY, XN, YN, CAREA)
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CALL CONDNO (MXND, NODES, QRAT, SRAT, COND2, SIDES, XN, YN, LSIDE)
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CND(IK2) = COND2
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KCND(IK2) = K2
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C RE-SORT AND PRUNE
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CALL BUBBLE (CND, KCND, 1, NTAB)
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DO 170 I = 1, 2
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IF (CND(NTAB) .LT. CNDTOL)NTAB = NTAB - 1
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170 CONTINUE
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NTAB = MIN0(NTAB, MAXTAB)
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IF (NTAB .LE. 0) RETURN
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CNDTOL = CND(NTAB)
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GO TO 120
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END
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