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$$$$ PPRE     NOTICE  CHAT      11/09/12    21:17:42     7124           
                                             DATE     11/09/12

    Operateur PPRE                           Voir aussi : BIF
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    SYNTAXE (EQEX) : Cf operateur EQEX
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    'OPER' PPRE  'VN' Rrho




  Description: The PPRE operator computes the pressure gradient term
               for the particle qdm equation.

               It computes the term: grad(P) * rhog / rhop

  Syntax (EQEX) :

     'OPER'     PPRE  'VN'  Rrho


  Rrho   FLOTTANT ratio  gas density / particle density
  VN     MOT      CHPOINT (VECT SOMMET) in table INCO for the
                  particle velocity