Manual pages | Cast3M

$$$$ MDIA     NOTICE  CHAT      11/09/12    21:17:12     7124           
                                             DATE     11/09/12
                                                                                
  Operateur MDIA                          Voir aussi :
     --------------   
     Syntaxe EQEX (cf EQEX) :

     ... 'EQEX' ... 'OPTI' MOT1 MOT2
                    'ZONE' MOD2
                    'OPER' 'MDIA' OBJ1
                    'INCO' MOT3 (MOT4)




     Description :
     _____________

     MDIA operator discretizes a linear term in a scalar or vectorial
equation. So, linear coupling between two unknowns can be treated.

     For a scalar equation dealing with the evolution of an unknown
named T, the linear term is of the form aT where a is a scalar
coefficient per unit time.

     For a system the linear term is of the generalised form aT
in an equation dealing with the evolution of an unknown named V.
T is the unknown on which the coupling acts (primal unknown) and
V the dual unknown.

     Sign convention is the following: when a and T are positive
the quantity T (resp. V) in the meshed domain decreases.

     Transient procedure EXEC use this operator with data
constructed with EQEX operator with the syntax done.


     Contents :
     __________
                                                                                
    'OPTI' : Key word introducing numerical options
     MOT1  : Discretization in space ('EF', 'VF' or 'EFM1')
     MOT2  : Discretization in time ('IMPL')

    'ZONE' : Key word introducing geometric informations
     MOD2  : MODEL of subtype 'NAVIER_STOKES' associated to the
             region where MDIA works.

    'OPER' : Key word introducing operator's name and physical data
    'MDIA' : Operator's name treated by EQEX
     OBJ1  : Coefficient a (CHPOINT or POINT or FLOTTANT or MOT)

    'INCO' : Key word introducing primal and dual unknowns' name
     MOT3  : Primal unknown's name (T)
     MOT4  : Dual unknown's name (V)
     When primal and dual names are the same, only one is mandatory.


     Results :
     _________

    - The mass matrix is stored in a MATRIK and set in order in the
table TAB1 at the index of type MOT MATELM.
    - No right hand side is created.


     Remarks :
     ___________
                                                                                
     1) When OBJ1 is of type MOT, we look for data in INCO table
at the index OBJ1.

     2) Geometric support (spg) of CHPOINT is one of those contained
in the table of subtype DOMAINE. Some compatibilities are verified :
   - For EF or EFM1 formulation, dual unknown's spg contain SOMMET
   - For VF formulation, dual unknown's spg contain CENTRE
   - When primal and dual unknowns are not the same, primal unknown's
spg is CENTRE or SOMMET

     3) Dimensions and spg of data :

                  +--------------------------------+
                  |      D i m e n s i o n         |
                  +--------------------------------+
                  | duale V | primale T | coeff. a |
    --------------+--------------------------------+
    a T dans V      1         1           1
    ->->
    a T dans V      1         IDIM        IDIM
    ->       ->
    a T dans V      IDIM      1           IDIM
      ->     ->
    a T dans V      IDIM      IDIM        1
    --------------+--------------------------------+

    --------------+-----------+
    primale T       S C S S C        S = SOMMET
    duale   V       S C C C S        C = CENTRE
    coeff   a       S C S C C
    --------------+-----------+

     4) Graduate user who develops his own transient procedure calls
the MDIA operator with the following syntax :
     MDIA TAB1 ;
with TAB1 : Table of subtype EQEX ; contains physical and numerical
            informations ; created by the EQEX operator.