inori2.F

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C  _clean      SUBROUTINE INORI2(X,IRECT,ISG,NEL,NINT,NOINT)
!||====================================================================
!||    inori2   ../starter/source/interfaces/inter2d1/inori2.F
!||--- called by ------------------------------------------------------
!||    i1chk2   ../starter/source/interfaces/inter2d1/i1chk2.F
!||    i3sti2   ../starter/source/interfaces/inter2d1/i3sti2.F
!||    i9sti2   ../starter/source/interfaces/int09/i9sti2.F
!||====================================================================
      SUBROUTINE inori2(IRECT, ISG  , NEL, NINT,
     .                  NOINT, YM1  , YM2, ZM1 , ZM2 ,
     .                  YE   , ZE)
C-----------------------------------------------
C   D e s c r i p t i o n
C-----------------------------------------------
C INIT INTERFACE : CHECK ORIENTATION
C     reverse segment connectivity if needed
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "units_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER ISG, NEL, NINT, NOINT
      INTEGER IRECT(4,*)
      my_real ym1, ym2, zm1, zm2,ye(4) ,ze(4)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER IR
      my_real N2, N3, YM, ZM, DDS
C-----------------------------------------------
C   E x t e r n a l   F u n c t i o n s
C-----------------------------------------------
      IF(nel==0) RETURN ! NO ELEM CONNECTED TO CURRENT SEGMENT
      !segment vector p1->p2
      n2= zm2-zm1
      n3= ym1-ym2
      !elem centroid
      ym= fourth*(ye(1)+ye(2)+ye(3)+ye(4))
      zm= fourth*(ze(1)+ze(2)+ze(3)+ze(4))
      !dot product
      dds=n2*(ym-ym1)+ n3*(zm-zm1)
      IF(dds >= zero)THEN
        !switch the segment connectivity to get outward normal
        ir=irect(1,isg)
        irect(1,isg)=irect(2,isg)
        irect(2,isg)=ir
        IF(nint>0) WRITE (iout,1100) isg, noint
        IF(nint<0) WRITE (iout,1200) isg, noint
      ENDIF
      RETURN
C-----------------------------------------------
 1100 FORMAT(' NODE CONNECTIVITY OF SECONDARY SEGMENT',i5,' OF INTERFACE',i10,' REVERSED')
 1200 FORMAT(' NODE CONNECTIVITY OF MAIN SEGMENT',i5,' OF INTERFACE',i10,' REVERSED')
      END