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65 lines
1.8 KiB
65 lines
1.8 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 DVOL2D( COORD, DISP, LSTSN, NSEG, DELVOL,
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* NDIM, AXI, NUMNP)
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C***********************************************************************
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C DESCRIPTION:
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C This routine computes the change in volume of a cavity formed
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C by the boundary of an element side set flag
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C FORMAL PARAMETERS:
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C COORD REAL Nodal Coordinates
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C DISP REAL Nodal Displacements
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C LSTSN INTEGER List of nodes on this boundary
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C LSTLEN INTEGER Length of node list
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C NSEG INTEGER Number of segments in this boundary
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C DELVOL REAL Change in volume of this cavity
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C NUMNP INTEGER Number of Nodes
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C AXI LOGICAL TRUE if axisymmetric mesh
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C CALLED BY:
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C***********************************************************************
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DIMENSION COORD(NUMNP, *), DISP(NUMNP, *), LSTSN(*)
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LOGICAL AXI
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PI = ATAN2(0.0, -1.0)
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DELVOL = 0.0
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DO 100 KSEG = 1 , NSEG
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J = LSTSN(2*KSEG)
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I = LSTSN(2*KSEG - 1)
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X1 = COORD(I,1)
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X2 = COORD(J,1)
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DX1 = DISP(I,1)
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DX2 = DISP(J,1)
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Y1 = COORD(I,2)
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Y2 = COORD(J,2)
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DY1 = DISP(I,2)
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DY2 = DISP(J,2)
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X12 = X1 - X2
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Y12 = Y1 - Y2
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VOL = (X12 * (DY2 + DY1) - Y12 * (DX2 + DX1) + DX1 * DY2 -
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* DX2 * DY1 ) / 2.0
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IF (AXI) THEN
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XC = (DX2 + DX1) / 4.0 + (X2 + X1) / 2.0
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VOL = 2.0 * PI * XC * VOL
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END IF
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DELVOL = DELVOL + VOL
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100 CONTINUE
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RETURN
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END
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