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http://dx.doi.org/10.7846/JKOSMEE.2017.20.1.37

Numerical Study on Rayleigh-Taylor Instability Using a Multiphase Moving Particle Simulation Method  

Kim, Kyung Sung (Department Naval Architect & Ocean Engineering, Tongmyong University)
Koo, Bonguk (Department Naval Architect & Marine Engineering, Changwon National University)
Kim, Moo-Hyun (Department Civil Engineering, Texas A&M University)
Park, Jong-Chun (Department Naval Architect & Ocean Engineering, Pusan National University)
Choi, Han-Suk (Graduate School of Engineering Mastership, POSTECH)
Cho, Yong-Jin (Department Naval Architect & Ocean Engineering, Dong-Eui University)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.20, no.1, 2017 , pp. 37-44 More about this Journal
Abstract
Complexity of multiphase flows due to existence of more than two interface including free-surface in one system, cannot be simulated easily. Since more than two fluids affect to flows and disturb interface, non-linearities such as instabilities can be appeared. Among several instabilities on multiphase flows, one of representative is Rayleigh-taylor instability. In order to examine in importance of density disparity, several cases with numerous Atwood number are set. Moreover, investigation of influence on initial disturbance were also considered. Moving particle simulation (MPS) method, which was employed in this paper, was not widely used for multiphase problem. In this study, by adding new particle interaction models such as self-buoyance correction, surface tension, and boundary condition at interface models, MPS were developed having more strength of physics and robust. By applying newly developed multiphase MPS, considered cases are performed and compared each other. Additionally, though existence of disagreement of magnitude of rising velocity between theoretical values from linear potential theory and that of numerical simulation, agreement of tendency can be proved of similarity of result. the discordance of magnitude can be explained due to non-linear effects on numerical simulation which was not considered in theoretical result.
Keywords
Moving particle simulation; Multiphase flow; Rayleigh-Taylor Instability;
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