Manual pages | Cast3M

$$$$ FLUX     NOTICE  BP208322  13/07/30    21:15:10     7809           
                                             DATE     13/07/30
                                             
  Operateur FLUX                           Voir aussi :
    --------------   
    CHPO1 = FLUX MMODE1 | FLOT1 GEO1   | ( 'DIRECTION' VEC1 ) (MOT1) ;
                        |              |
                        | CH2          |
                        | CH3  LMOTS1  | 
                        

    Description :
    _____________

    The FLUX operator enables the user to impose a flux on a part of the
    contour (resp. of the envelope) of a 2D (resp. 3D) structure.

    Contents :
    __________

    CH1        : equivalent nodal fluxes (CHPOINT type with 1 component)
    
    MMODE1     : modeled structure (MMODEL type).

    FLOT1      : flux algebraic value (FLOTTANT type).

    GEO1       : structure side subjected to the flux (MAILLAGE type).

   'DIRECTION' : key word indicating that the direction of the flux
                 is to be given (by default, the flux is directed 
                 according to the element normal).

    VEC1       : vector indicating the direction of the flux
                 (POINT type).
                 
    CH2        : 1 component field giving the algebraic value of the 
                 flux. CH2 should be of CHAMELEM type (if expressed at 
                 Gauss points) or of CHPOINT type (if expressed at nodes).
                 
    CH3        : 2 or 3 components fields for massive 2D or 3D models.
                 CH3 may be of CHAMELEM or CHPOINT type. 
                 
    LMOTS1     : list of componant (LISTMOTS type) of CH3 to be taken 
                 (see note 2).
            
    MOT1       : key word indicating, for the shells, on which
                 layer the convection is done :
                 'SUPE'  : top layer
                 'INFE'  : bottom layer
                
    Note 1 :
    _______

    A flux is considered positive when it is directed towards
    the inside of a solid element.
    
    Note 2 (for LMOTS1 syntax):
    __________________________
    
    Componants of CH3 are associated with direction 1 2 3 by their 
    declaration order in LMOTS1. The dot product with normals is locally
    performed. Resulting flux is positive when vector points inside 
    solid elements.
   

    Note 3 (for shell elements) :
    ____________________________ 

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

    Note 4 (for the 'DIRE' option) :
    _______________________________ 
   
    For option DIRE, the dot product (DIRE*normals by elements) must be
    mandatorily of same sign (no plies on surface ). 
   
    Note 5 :
    ______
    
    If the MODELE used is larger than the area where the FLUX is defined
    (by field CHPO2  or nodes of mesh GEO1), then external boundary 
    elements will support also a flux. We advise you to give to the 
    operator a reduction of the MODELE to the strictly concerned elements.