An improved multiphase lattice Boltzmann flux solver with a modified Cahn-Hilliard equation for multiphase flow with super large density ratio

被引：8

作者：

Zhang, Da ^{[1
,2
]}

Li, Yan ^{[1
]}

Wang, Yan ^{[3
]}

Shu, Chang ^{[2
]}

机构：

[1] Ocean Univ China, Coll Engn, Mech Engn, Qingdao 266100, Peoples R China

[2] Natl Univ Singapore, Dept Mech Engn, 10 Kent Ridge Crescent, Singapore 119260, Singapore

[3] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Mech Struct, Yudao St 29, Nanjing 210016, Jiangsu, Peoples R China

来源：

PHYSICS OF FLUIDS | 2024年 / 36卷 / 02期

关键词：

RELATIVE PERMEABILITY; LEVEL SET; SIMULATION; MODEL;

D O I：

10.1063/5.0189032

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

In this study, a modified Cahn-Hilliard equation with a very simple format was proposed, which can be used to simulate immiscible multi-component/multiphase flow with a super large density ratio. In addition, based on this modified equation and the Navier-Stokes equations, an improved multiphase lattice Boltzmann flux solver (IMLBFS) has been proposed, and its computational ability has been tested by multiple numerical examples, including Laplace law, two bubbles merging, contact angle, bubble rising, and droplet splashing on a thin film. The results show that the proposed IMLBFS can simulate immiscible two-phase flow with a very large density ratio up to 1:5000 or 1:10 000 under various operating conditions, including the Reynolds number reaching 10 000. In addition, IMLBFS also has excellent features such as clear physical properties, freely adjustable source term strength, and effective suppression of mass loss.

引用

页数：13

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