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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v27.i2-4.120
pages 331-362

Numerical Analysis of Multiphase Mixing - Comparison of First and Second Order Accurate Schemes

M. Leskovar
"Jozef Stefan" Institute, Slovenia
Jure Marn
University of Maribor, Slovenia
Borut Mavko
Reactor Engineering Division, "Jozef Stefan" Institute, Jamova 39, 1000 Ljubljana, SLOVENIA

ABSTRACT

During a severe reactor accident following core meltdown when the molten fuel comes into contact with the coolant water a steam explosion may occur. The steam explosion can be divided into more stages. The first, premixing stage is important since it gives the initial conditions of the possible steam explosion and determines the maximum quantity of melt, which might be then involved into the explosion. To investigate the mixing process associated with the melt penetration a large number of premixing codes has been developed.
The purpose of this work is to analyze the influence of first and second order accurate numerical schemes on the premixing phase simulation results and to find out if a probabilistic treatment of some terms in the multiphase flow equations introduces any advantages. For performing this kind of analysis the simple premixing code ESE has been developed.
With ESE a number of premixing experiments performed at the Oxford University and at the QUEOS facility at Forschungszentrum Karlsruhe has been simulated using the first order accurate upwind method and the second order accurate high-resolution method. The performed analysis showed that the results obtained with the first and second accurate numerical schemes differ and that the probabilistic approach has an almost negligible effect on the simulation results.


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