Numerical simulations of gas-liquid-particle three-phase flows using a hybrid method

Guo, L.*; 守田 幸路*; 飛田 吉春

Journal of Nuclear Science and Technology, 53(2), p.271 - 280, 2016/02

https://doi.org/10.1080/00223131.2015.1043156

For the analysis of debris behavior in core disruptive accidents of liquid metal fast reactors, a hybrid computational tool was developed using the discrete element method (DEM) for calculation of solid particle dynamics and a multi-fluid model of a reactor safety analysis code, SIMMER-III, to reasonably simulate transient behavior of three-phase flows of gas-liquid-particle mixtures. A coupling numerical algorithm was developed to combine the DEM and fluid-dynamic calculations, which are based on an explicit and a semi-implicit method, respectively. The developed method was validated based on experiments of water-particle dam break and fluidized bed in systems of gas-liquid-particle flows. Reasonable agreements between the simulation results and experimental data demonstrate the validity of the present method for complicated three-phase flows with large amounts of solid particles.