slena.F

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!||====================================================================
!||    slena    ../engine/source/elements/solid/solide/slena.F
!||--- called by ------------------------------------------------------
!||    fdlen3   ../engine/source/elements/solid/solide/fdlen3.F
!||    sdlen3   ../engine/source/elements/solid/solide/sdlen3.F
!||====================================================================
      SUBROUTINE slena(
     1   N1X,     N2X,     N3X,     N4X,
     2   N5X,     N6X,     N1Y,     N2Y,
     3   N3Y,     N4Y,     N5Y,     N6Y,
     4   N1Z,     N2Z,     N3Z,     N4Z,
     5   N5Z,     N6Z,     X1,      X2,
     6   X3,      X4,      X5,      X6,
     7   X7,      X8,      Y1,      Y2,
     8   Y3,      Y4,      Y5,      Y6,
     9   Y7,      Y8,      Z1,      Z2,
     A   Z3,      Z4,      Z5,      Z6,
     B   Z7,      Z8,      AREAM,   NEL)
C
C NOTE : SURFACE OF FACETS IS AVAILABLE FOR ALE ELEMENTS
C
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER, INTENT(IN) :: NEL
      INTEGER J
      my_real
     .   X1(*), X2(*), X3(*), X4(*), X5(*), X6(*), X7(*), X8(*),
     .   Y1(*), Y2(*), Y3(*), Y4(*), Y5(*), Y6(*), Y7(*), Y8(*),  
     .   Z1(*), Z2(*), Z3(*), Z4(*), Z5(*), Z6(*), Z7(*), Z8(*),
     .   N1X(*), N2X(*), N3X(*), N4X(*), N5X(*), N6X(*),
     .   N1Y(*), N2Y(*), N3Y(*), N4Y(*), N5Y(*), N6Y(*),
     .   N1Z(*), N2Z(*), N3Z(*), N4Z(*), N5Z(*), N6Z(*),
     .   AREAM(*)
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I
C     REAL
      my_real
     .   AREA(6)
C-----------------------------------------------
      DO I=1,nel
        n1x(i)=(y3(i)-y1(i))*(z2(i)-z4(i)) - (z3(i)-z1(i))*(y2(i)-y4(i))
        n1y(i)=(z3(i)-z1(i))*(x2(i)-x4(i)) - (x3(i)-x1(i))*(z2(i)-z4(i))
        n1z(i)=(x3(i)-x1(i))*(y2(i)-y4(i)) - (y3(i)-y1(i))*(x2(i)-x4(i))
        area(1)=n1x(i)**2+n1y(i)**2+n1z(i)**2
C
        n2x(i)=(y7(i)-y4(i))*(z3(i)-z8(i)) - (z7(i)-z4(i))*(y3(i)-y8(i))
        n2y(i)=(z7(i)-z4(i))*(x3(i)-x8(i)) - (x7(i)-x4(i))*(z3(i)-z8(i))
        n2z(i)=(x7(i)-x4(i))*(y3(i)-y8(i)) - (y7(i)-y4(i))*(x3(i)-x8(i))
        area(2)=n2x(i)**2+n2y(i)**2+n2z(i)**2
C
        n3x(i)=(y6(i)-y8(i))*(z7(i)-z5(i)) - (z6(i)-z8(i))*(y7(i)-y5(i))
        n3y(i)=(z6(i)-z8(i))*(x7(i)-x5(i)) - (x6(i)-x8(i))*(z7(i)-z5(i))
        n3z(i)=(x6(i)-x8(i))*(y7(i)-y5(i)) - (y6(i)-y8(i))*(x7(i)-x5(i))
        area(3)=n3x(i)**2+n3y(i)**2+n3z(i)**2
C
        n4x(i)=(y2(i)-y5(i))*(z6(i)-z1(i)) - (z2(i)-z5(i))*(y6(i)-y1(i))
        n4y(i)=(z2(i)-z5(i))*(x6(i)-x1(i)) - (x2(i)-x5(i))*(z6(i)-z1(i))
        n4z(i)=(x2(i)-x5(i))*(y6(i)-y1(i)) - (y2(i)-y5(i))*(x6(i)-x1(i))
        area(4)=n4x(i)**2+n4y(i)**2+n4z(i)**2
C
        n5x(i)=(y7(i)-y2(i))*(z6(i)-z3(i)) - (z7(i)-z2(i))*(y6(i)-y3(i))
        n5y(i)=(z7(i)-z2(i))*(x6(i)-x3(i)) - (x7(i)-x2(i))*(z6(i)-z3(i))
        n5z(i)=(x7(i)-x2(i))*(y6(i)-y3(i)) - (y7(i)-y2(i))*(x6(i)-x3(i))
        area(5)=n5x(i)**2+n5y(i)**2+n5z(i)**2
C
        n6x(i)=(y8(i)-y1(i))*(z4(i)-z5(i)) - (z8(i)-z1(i))*(y4(i)-y5(i))
        n6y(i)=(z8(i)-z1(i))*(x4(i)-x5(i)) - (x8(i)-x1(i))*(z4(i)-z5(i))
        n6z(i)=(x8(i)-x1(i))*(y4(i)-y5(i)) - (y8(i)-y1(i))*(x4(i)-x5(i))
        area(6)=n6x(i)**2+n6y(i)**2+n6z(i)**2
        aream(i)= max(area(1),area(2),area(3),area(4),area(5),area(6))
      ENDDO
      RETURN
      END