Proceedings home preface contents authors keywords copyright reference ©2012 Civil-Comp Ltd				Paper 117 Multi-Physics Computational Fluid Dynamics Modelling of Three-Phase Flow in a Nano-Particle Separator using the Particle-Based Method R. Takahashi1, M. Suzuki2, M. Yamamoto2 and H. Kitada3 1Graduate school of Mechanical Engineering, 2Department of Mechanical Engineering, Tokyo University of Science, Japan 3CMS Co. Ltd., Japan Keywords: flow modeling, three-phase flow, particle method, particle separator, centrifugal force, nano-scale particle. full paper (pdf) - reference Recently, in the chemical, metal and environmental industries, equipment to separate and classify nano-size particles are required in order to nanomize material particles, collect microscopic particles and purify wastewater. The objective of the study, described in this paper, is the development of a new solid-liquid separator, which enables the separation and classification of nano-size particles, to cut down the water content ratio of disposed particles and to accomplish extremely high collection efficiency by using centrifugal force and differences in specific gravity. In this paper, the development of a numerical method to simulate the gas-liquid-solid three-phase flow, based on the moving particle semi-implicit (MPS) approach. Some numerical tests were conducted with liquid single-phase, gas-liquid two-phase, gas-liquid-solid three-phase simulations. These include dam break phenomenon with liquid single-phase and gas-liquid two-phase simulations and air-bubble engulfmentphenomenon with the gas-liquid-solid three-phase simulation. In the dam break simulations, two computational results indicated reasonable agreement with the experimental results. In the air-bubble engulfment simulation, our numerical method reproduced some interactions of the three phases that are difficult to be duplicated with the traditional grid methods