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$$$$ CONV     NOTICE  CHAT      11/09/12    21:15:34     7124           
                                             DATE     11/09/12
                                             
  Operateur CONVECTION                      Voir aussi :
    --------------------   
    CHPO1 = CONV  MMODE1 CHAM1 | 'T'  FLOT1 | ;
                               | CHPO2      |


    Description :
    ____________

    The CONVECTION operator makes it possible to impose a forced
  convection condition on a part of the contour (of the envelope) 
  of a structure.

    Contents :
    _________

    MMODE1  :  modeled contour (or envelope) (MMODEL type)

    CHAM1   :  value(s) of the exchange coefficient on the 
               considered contour (or envelope) (MCHAML type,
               CARACTERISTIQUES subtype)

    'T'     :  key word followed by :
    FLOT1   :  temperature of the outside medium (FLOTTANT type)

    CHPO2   :  values of the temperature of the surrounding
               environment for the different nodes of the 
               considered contour (or envelope) (CHPOINT type)

    CHPO1   :  equivalent nodal fluxes (CHPOINT type)

   Important note :
   ________________

   
   The shell layers are defined with respect to the element 
   outside normal: the top layer is oriented towards the outside
   normal, with respect to the median plane.
   If the elements are not oriented coherently, it is required that
   they be reoriented using the ORIENT operator.

   If CHPO2 has more than one component, the name of components will
   be used to select the right one. Name must be one of T, TSUP, TINF.
   This allows to invoke PASAPAS with a CHARGEMENT objet (loading) of
   type TECO with external temperatures for upper side or under side. 
 
   Note :
   ______

   The CONV operator is also used to compute the heat flux associated
   with a linearized radiant heat exchange condition. In this case, the
   input model formulation is RAYONNEMENT (radiant).