geom_tet_quality.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: geom_tet_quality.f90 3093 2008-04-22 14:51:09Z sfilippo $
!
! Description:
!
SUBMODULE(tools_mesh_basics) geom_tet_quality_implementation
    IMPLICIT NONE

    CONTAINS

        MODULE PROCEDURE geom_tet_quality
            USE class_psblas, ONLY : psb_dpk_
            USE class_vector !, ONLY : mag
            USE class_vertex, ONLY : vertex, OPERATOR(-)
            IMPLICIT NONE
            !
            INTEGER :: iv1, iv2
            REAL(psb_dpk_) :: sum_edge_sq
            TYPE(vertex) :: verts(4)
            TYPE(vector) :: verts_temp

            verts = [ v1, v2, v3, v4 ]

            sum_edge_sq = 0.d0

            ! All vertices are connected to all others, so just permutate to find all edge lengths
            DO iv2 = 1, 3
                DO iv1 = iv2 + 1, 4
                    verts_temp = verts(iv2) - verts(iv1)
                    !sum_edge_sq = sum_edge_sq + (verts(iv2) - verts(iv1))%mag()**2
                    sum_edge_sq = sum_edge_sq + verts_temp%mag()**2
                ENDDO
            ENDDO

            geom_tet_quality = SIGN((vol*vol)**(1.0d0/3.d0) * 6.0d0**(5.d0/3.d0) * 2.0**(1.d0/3.d0) / &
                &               sum_edge_sq, vol)  ! signed quality, must handle neg. volume

        END PROCEDURE geom_tet_quality

END SUBMODULE geom_tet_quality_implementation