Manual pages | Cast3M

$$$$ FISS     NOTICE  CHAT      11/09/12    21:16:15     7124           
                                             DATE     11/09/12

  Operateur FISS                          Voir aussi : 
     --------------   
      RES = FISS MODL1 MAT1 TAB_CL


     Description :
     ____________

     This operator calculates the leakage flowrate of an air-steam
   mixture through a traversing macrocrack (opening greater than 25
   microns), in the steady state, for an imposed wall temperature and
   imposed inlet and outlet conditions for the fluid.
   The operator uses a one-dimensionnal discretization for the flow : 
   the crack opening (the crack small dimension) and the crack extent 
   ( the crack large dimension) are not meshed.  
   The two-phase flow model is homogeneous (both phases have the 
   velocity and temperature).

     Comments:
     _____________                                                       
                    
     MODL1  : model object (of type MMODEL)
              (the mesh in MODL1 is made of SEG2 elements defining the
              crack path from the inlet to the outlet)
     MAT1   : field of material characteristics (of type MCHAML, and 
              sub-type CARACTERISTIQUES)
     TAB_CL : boundary conditions table :

        TAB_CL.'PRESSION_TOTALE_AMONT' : inlet total pressure (Pa)
                                         (of type FLOTTANT)
        TAB_CL.'PRESSION_VAPEUR_AMONT' : inlet steam partial pressure
                                         (Pa) (of type FLOTTANT)
        TAB_CL.'TEMPERATURE_AMONT'     : inlet gas temperature (°C) 
                                         (of type FLOTTANT)
        TAB_CL.'PRESSION_TOTALE_AVAL'  : outlet total pressure (Pa) 
                                         (of type FLOTTANT)
        TAB_CL.'TEMPERATURE_PAROI'     : wall temperature (°C) 
                                         (of type CHPOINT)
        TAB_CL.'OUVERTURE'             : crack opening (m) 
                                         (type CHPOINT)
        (TAB_CL.'ETENDUE')             : crack extent (m) 
                                         (type CHPOINT)
        (TAB_CL.'DEBIT_INITIAL')       : initial flowrate (kg/m2/s)
                                         (of type FLOTTANT)

     RES : field by point with several components for each characteristic 
           of the flow along the crack.

     component   | meaning
      name       | 

          'P'    :  pressure               (Pa)
          'PV'   :  steam partial pressure (Pa)
          'TF'   :  temperature            (°C)
          'X     :  steam quality
          'U'    :  velocity               (m/s)
          'H'    :  heat exchange coefficient (W/m2/K)
          'Q'    :  total flowrate         (kg/s)
          'QA'   :  air flowrate           (kg/s)
          'QE'   :  water flowrate(liquid+steam) (kg/s)
          'RE'   :  Reynolds number
          'F'    :  heat flux between the fluid and the wall (W/m2)
 
     Remark:
     _________                                                       

     TAB_CL has to be filled before every call to FISS.