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102 lines
3.4 KiB
102 lines
3.4 KiB
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 PRVOL (NDIM, CRD, IX, NUMNP, NUMEL, NNODE,
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& VOLUME, IUNIT)
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C ... ESTIMATE TIMESTEP FOR MESH --- BRICKS ONLY
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DIMENSION CRD(NUMNP, *), IX(NNODE,*)
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DIMENSION GRADOP(8)
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REAL volume(*)
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IF (NDIM .EQ. 3 .AND. NNODE .EQ. 8) THEN
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DO 20 IEL = 1, numel
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y1 = crd(ix(1,iel),2)
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y2 = crd(ix(2,iel),2)
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y3 = crd(ix(3,iel),2)
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y4 = crd(ix(4,iel),2)
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y5 = crd(ix(5,iel),2)
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y6 = crd(ix(6,iel),2)
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y7 = crd(ix(7,iel),2)
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y8 = crd(ix(8,iel),2)
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Z1 = crd(ix(1,iel),3)
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Z2 = crd(ix(2,iel),3)
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Z3 = crd(ix(3,iel),3)
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Z4 = crd(ix(4,iel),3)
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Z5 = crd(ix(5,iel),3)
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Z6 = crd(ix(6,iel),3)
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Z7 = crd(ix(7,iel),3)
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Z8 = crd(ix(8,iel),3)
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Z24 = Z2 - Z4
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Z52 = Z5 - Z2
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Z45 = Z4 - Z5
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GRADOP(1) = ( Y2*(Z6-Z3-Z45) + Y3*Z24 + Y4*(Z3-Z8-Z52)
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* + Y5*(Z8-Z6-Z24) + Y6*Z52 + Y8*Z45 ) / 12.
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Z31 = Z3 - Z1
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Z63 = Z6 - Z3
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Z16 = Z1 - Z6
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GRADOP(2) = ( Y3*(Z7-Z4-Z16) + Y4*Z31 + Y1*(Z4-Z5-Z63)
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* + Y6*(Z5-Z7-Z31) + Y7*Z63 + Y5*Z16 ) / 12.
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Z42 = Z4 - Z2
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Z74 = Z7 - Z4
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Z27 = Z2 - Z7
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GRADOP(3) = ( Y4*(Z8-Z1-Z27) + Y1*Z42 + Y2*(Z1-Z6-Z74)
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* + Y7*(Z6-Z8-Z42) + Y8*Z74 + Y6*Z27 ) / 12.
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Z13 = Z1 - Z3
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Z81 = Z8 - Z1
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Z38 = Z3 - Z8
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GRADOP(4) = ( Y1*(Z5-Z2-Z38) + Y2*Z13 + Y3*(Z2-Z7-Z81)
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* + Y8*(Z7-Z5-Z13) + Y5*Z81 + Y7*Z38 ) / 12.
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Z86 = Z8 - Z6
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Z18 = Z1 - Z8
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Z61 = Z6 - Z1
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GRADOP(5) = ( Y8*(Z4-Z7-Z61) + Y7*Z86 + Y6*(Z7-Z2-Z18)
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* + Y1*(Z2-Z4-Z86) + Y4*Z18 + Y2*Z61 ) / 12.
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Z57 = Z5 - Z7
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Z25 = Z2 - Z5
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Z72 = Z7 - Z2
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GRADOP(6) = ( Y5*(Z1-Z8-Z72) + Y8*Z57 + Y7*(Z8-Z3-Z25)
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* + Y2*(Z3-Z1-Z57) + Y1*Z25 + Y3*Z72 ) / 12.
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Z68 = Z6 - Z8
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Z36 = Z3 - Z6
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Z83 = Z8 - Z3
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GRADOP(7) = ( Y6*(Z2-Z5-Z83) + Y5*Z68 + Y8*(Z5-Z4-Z36)
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* + Y3*(Z4-Z2-Z68) + Y2*Z36 + Y4*Z83 ) / 12.
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Z75 = Z7 - Z5
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Z47 = Z4 - Z7
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Z54 = Z5 - Z4
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GRADOP(8) = ( Y7*(Z3-Z6-Z54) + Y6*Z75 + Y5*(Z6-Z1-Z47)
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* + Y4*(Z1-Z3-Z75) + Y3*Z47 + Y1*Z54 ) / 12.
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C Calculate element volume
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VOLUME(iel) = crd(ix(1,iel),1) * GRADOP(1)
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* + crd(ix(2,iel),1) * GRADOP(2)
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* + crd(ix(3,iel),1) * GRADOP(3)
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* + crd(ix(4,iel),1) * GRADOP(4)
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* + crd(ix(5,iel),1) * GRADOP(5)
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* + crd(ix(6,iel),1) * GRADOP(6)
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* + crd(ix(7,iel),1) * GRADOP(7)
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* + crd(ix(8,iel),1) * GRADOP(8)
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if (volume(iel) .lt. 0.0) then
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write (*,*) 'Zero or negative volume at element',
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& iel
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endif
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20 CONTINUE
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C ... Special for Frank Dempsey -- Print volumes and connectivity to file
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DO 30 IEL=1, NUMEL
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write (IUNIT,999) iel, volume(iel), (ix(i,iel),i=1,8)
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999 format(i8,1PE17.8,8i8)
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30 CONTINUE
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ELSE
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STOP 'Not Implemented'
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END IF
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RETURN
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END
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