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Effect of initial densities in the lattice Boltzmann model for non-ideal fluid with curved interface

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Title: Effect of initial densities in the lattice Boltzmann model for non-ideal fluid with curved interface
Authors: Gong, Jiaming Browse this author
Oshima, Nobuyuki Browse this author →KAKEN DB
Issue Date: 28-Jun-2017
Publisher: American Institute of Physics (AIP)
Journal Title: Physics of fluids
Volume: 29
Issue: 6
Start Page: 67108
Publisher DOI: 10.1063/1.4989638
Abstract: The effect of initial densities in a free energy based two-phase-flow lattice Boltzmann method for non-ideal fluids with a curved interface was investigated in the present work. To investigate this effect, the initial densities in the liquid and gas phases coming from the saturation points and the equilibrium state were adopted in the simulation of a static droplet in an open and a closed system. For the purpose of simplicity and easier comparison, the closed system is fabricated by the implementation of the periodic boundary condition at the inlet and outlet of a gas channel, and the open system is fabricated by the implementation of a constant flux boundary condition at the inlet and a free-out boundary condition at the outlet of the same gas channel. By comparing the simulation results from the two types of initial densities in the open and closed systems, it is proven that the commonly used saturation initial densities setting is the reason for droplet mass and volume variation which occurred in the simulation, particularly in the open system with a constant flux boundary condition. Such problems are believed to come from the curvature effect of the surface tension and can be greatly reduced by adopting the initial densities in the two phases from equilibrium state.
Rights: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in Physics of Fluids 29, 067108 (2017) and may be found at http://aip.scitation.org/doi/10.1063/1.4989638.
Type: article
URI: http://hdl.handle.net/2115/70861
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大島 伸行

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