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Development and Application of a Fully Implicit Fluid Dynamics Code for Multiphase Flow

Tadashi Morii, Yumi Ogawa

Nuclear Technology / Volume 115 / Number 3 / September 1996 / Pages 333-341

Technical Paper / Heat Transfer and Fluid Flow / dx.doi.org/10.13182/NT96-A15843

Multiphase flow frequently occurs in a progression of accidents of nuclear reactor severe core damage. The CHAMPAGNE code has been developed to analyze thermohydraulic behavior of multiphase and multicomponent fluid, which requires for its characterization more than one set of velocities, temperatures, masses per unit volume, and so forth at each location in the calculation domain. Calculations of multiphase flow often show physical and numerical instability. The effect of numerical stabilization obtained by the upwind differencing and the fully implicit techniques gives us a convergent solution more easily than other techniques. Several results calculated by the CHAMPAGNE code are explained.