Abstract
For the design of nuclear facilities, comprehensive understanding for two-phase flow phenomena is needed. Because of limitations of experimental and theoretical approach, numerical analysis has been applied together to identify the mechanism of two-phase flow. For the numerical analysis, the lattice Boltzmann(LB) model for two-phase flow has been remarkably developed as an alternative tool. Especially, free energy based LB models have been showing stable solutions for high density ratio up to 1:1000. Although they are free-energy based models of the same concept, the LB equations used in the models differ. Therefore each method needs to be compared to identify its own characteristic. In this study, the pros and cons of two representative LB models are compared. For the test, moving liquid droplet in the enclosed gas and rising bubble in the heavier fluid are simulated, and the results of two LB models are compared with those of VOF (Volume of Fluid) method.
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