Manual pages | Cast3M

$$$$ ELNO     NOTICE  CHAT      11/09/12    21:16:01     7124           
                                             DATE     11/09/12

    Operateur ELNO                           Voir aussi : MODE DOMA
    --------------                                        KCHT   PENT   

    CHP2 = ELNO MODE1 CHP1 | ('CENTRE')                ;
                           | ('CENTREP1')
                           | ('MSOMMET')
                           | ('VOLUMF' GRCHP1 LIMCHP1)                      





    Description :
    _____________

   Turns a CHPOINT CENTRE or CENTREP1
    into a CHPOINT SOMMET

    Contents :
    __________

   MODE1      : modeled structure (MMODEL type) 'NAVIER_STOKES'

   CHP1       : CHPOINT CENTRE
              The object needs to have only one component and
              not partitioned

   CHP2       : CHPOINT SOMMET

   'CENTRE'    (default)
      or
   'CENTREP1' : type of CHP1
      or
   'MSOMMET'

   'VOLUMF'   : reconstruction using a Finite Volume Method
             In this case, following informations are required :
   
    GRCHP1 : CHPOINT CENTRE containing the values of the gradient of CHP1
   
    LIMCHP1 : CHPOINT CENTRE contenant les values that limit the
              gradient : MUSCL Method (see insturction PENT).
                                                                             
   Further information :                                                 
   _____________________                                                
                                                                                
      We look for CHP2 minimizing in a distribution sense the difference
   (CHP2 - CHP1) with the additional constraint : the integral of CHP2
   over the domain is conserved.
      This transformation only makes sense for intensive physical
   quantities like temperature,velocities,pressure ..
      This property isn't checked by the operator.
      The mass matrices are lumped.

    Example :
      KPRES = 'CENTREP1' ;
      pe=exco rv.inco.'PRESSION' 'PRES' ;
      pe= kcht $bell scal KPRES pe ;

      pn= elno $bell pe KPRES ;

                                                    
    CHP1 MSOMMET case :
    -------------------

    In that case CHP1, given on the element vertices, is computed
    at the other nodes according to the corresponding linear element.


    About finite volume :
    ____________________

      The value at the vertex (SOMMET) is calculated by making the 
    average of the values reconstructed from each centre of
    element it belong to.

      So if MOTCLE 'VOLUMF' is used, gradient and limiting
      values must be given.

      If both GRCHP1 and LIMCHP1 are calculated using
      instruction PENT, the reconstruction of a linear function
      is exact (inside the domain).

      If LIMCHP1 is 0 everywhere then the reconstruction
      consists simply in calculating the average of the
      values of CHP1 at the centers next to a vertex.