Improving our understanding of the mechanisms governing two-phase flows in nuclear reactors is very important for reactor design and safety analyses. Recent progress in numerical methods of fluid mechanics combined with systematically increasing computational capabilities of supercomputers make it possible to perform direct numerical simulations (DNS) of turbulent gas/liquid two-phase flows. Using appropriate techniques of averaging, the results of such simulations can be used to investigate the effect of system geometry and operating conditions on phase and velocity distributions, shear stress and the associated pressure drop. This, in turn, will be very useful in the development of simplified models for application in multiphase computational fluid dynamics (CFD) codes.
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