A weighted multiple-relaxation-time lattice Boltzmann method for multiphase flows and its application to partial coalescence cascades

JOURNAL OF COMPUTATIONAL PHYSICS

卷:341

Article

Fakhari, Abbas¹  Bolster, Diogo¹  Luo, Li-Shi^2,3 

[1] Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 USA

[2] Computat Sci Res Ctr, Beijing 100193, Peoples R China

[3] Old Dominion Univ, Dept Math & Stat, Norfolk, VA 23529 USA

关键词: Multiphase flow;    Interfacial dynamics;    Partial coalescence;    Coalescence cascade;    Lattice Boltzmann method;    Adaptive mesh refinement;   

DOI  :  10.1016/j.jcp.2017.03.062

来源: Elsevier

【 摘 要 】

We present a lattice Boltzmann method (LBM) with a weighted multiple-relaxation-time (WMRT) collision model and an adaptive mesh refinement (AMR) algorithm for direct numerical simulation of two-phase flows in three dimensions. The proposed WMRT model enhances the numerical stability of the LBM for immiscible fluids at high density ratios, particularly on the D3Q27 lattice. The effectiveness and efficiency of the proposed WMRT-LBM-AMR is validated through simulations of (a) buoyancy-driven motion and deformation of a gas bubble rising in a viscous liquid; (b) the bag-breakup mechanism of a falling drop; (c) crown splashing of a droplet on a wet surface; and (d) the partial coalescence mechanism of a liquid drop at a liquid-liquid interface. The numerical simulations agree well with available experimental data and theoretical approximations where applicable. (C) 2017 Elsevier Inc. All rights reserved.

【 授权许可】

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