valid_tet.f90 Source File

!
!     (c) 2019 Guide Star Engineering, LLC
!     This Software was developed for the US Nuclear Regulatory Commission (US NRC)
!     under contract "Multi-Dimensional Physics Implementation into Fuel Analysis under
!     Steady-state and Transients (FAST)", contract # NRC-HQ-60-17-C-0007
!
!    NEMO - Numerical Engine (for) Multiphysics Operators
! Copyright (c) 2007, Stefano Toninel
!                     Gian Marco Bianchi  University of Bologna
!              David P. Schmidt    University of Massachusetts - Amherst
!              Salvatore Filippone University of Rome Tor Vergata
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!---------------------------------------------------------------------------------
!
! $Id$
!
! Description:
!    Checks that a tet is valid using a scheme that is consistent with how OptMS does it.
!    Can only be used for strictly local tetrahedral cells
!
FUNCTION tet_valid(msh,ic)

    USE class_psblas
    USE class_connectivity
    USE class_mesh
    USE class_vector
    USE class_vertex
    USE tools_mesh_optimize, ONLY: right_handed


    IMPLICIT NONE
    !
    LOGICAL                :: tet_valid
    TYPE(mesh), INTENT(IN) :: msh            ! the mesh structure
    INTEGER, INTENT(IN)    :: ic             ! the cell ID number
    !
    REAL(psb_dpk_)      :: vtx1(3),vtx2(3),vtx3(3),vtx4(3)
    INTEGER ::  iv1, iv2, iv3, iv4
    INTEGER, POINTER :: iv2c(:) => NULL()
    INTEGER :: valid_flag,ierr

    ! Get vertex indices
    CALL msh%v2c%get_ith_conn(iv2c,ic)
    iv1 = iv2c(1)
    iv2 = iv2c(2)
    iv3 = iv2c(3)
    iv4 = iv2c(4)

    vtx1 = msh%verts(iv1)%position_()
    vtx2 = msh%verts(iv2)%position_()
    vtx3 = msh%verts(iv3)%position_()
    vtx4 = msh%verts(iv4)%position_()

    valid_flag = right_handed(vtx1, vtx2, vtx3, vtx4)

    IF ( valid_flag == 1) THEN
        tet_valid = .TRUE.
    ELSE
        tet_valid = .FALSE.
    ENDIF

END FUNCTION tet_valid