中国物理B ›› 2022, Vol. 31 ›› Issue (2): 24701-024701.doi: 10.1088/1674-1056/ac11d8

• • 上一篇    下一篇

Lattice Boltzmann model for interface capturing of multiphase flows based on Allen-Cahn equation

He Wang(王贺)1, Fang-Bao Tian(田方宝)2, and Xiang-Dong Liu(刘向东)1,3,†   

  1. 1 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
    2 School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600, Australia;
    3 College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
  • 收稿日期:2021-04-26 修回日期:2021-06-28 接受日期:2021-07-07 出版日期:2022-01-13 发布日期:2022-01-25
  • 通讯作者: Xiang-Dong Liu E-mail:liuxd@yzu.edu.cn

Lattice Boltzmann model for interface capturing of multiphase flows based on Allen-Cahn equation

He Wang(王贺)1, Fang-Bao Tian(田方宝)2, and Xiang-Dong Liu(刘向东)1,3,†   

  1. 1 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;
    2 School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600, Australia;
    3 College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China
  • Received:2021-04-26 Revised:2021-06-28 Accepted:2021-07-07 Online:2022-01-13 Published:2022-01-25
  • Contact: Xiang-Dong Liu E-mail:liuxd@yzu.edu.cn

摘要: A phase-field-based lattice Boltzmann model is proposed for the interface capturing of multi-phase flows based on the conservative Allen-Cahn equation (ACE). By adopting the improved form of a relaxation matrix and an equilibrium distribution function, the time derivative t(φu) induced by recovering the diffusion term in ACE is eliminated. The conducted Chapman-Enskog analysis demonstrates that the correct conservative ACE is recovered. Four benchmark cases including Zalesak's disk rotation, vortex droplet, droplet impact on thin film, and Rayleigh-Taylor instability are investigated to validate the proposed model. The numerical results indicate that the proposed model can accurately describe the complex interface deformation.

关键词: lattice Boltzmann method, phase field, multiphase flow

Abstract: A phase-field-based lattice Boltzmann model is proposed for the interface capturing of multi-phase flows based on the conservative Allen-Cahn equation (ACE). By adopting the improved form of a relaxation matrix and an equilibrium distribution function, the time derivative t(φu) induced by recovering the diffusion term in ACE is eliminated. The conducted Chapman-Enskog analysis demonstrates that the correct conservative ACE is recovered. Four benchmark cases including Zalesak's disk rotation, vortex droplet, droplet impact on thin film, and Rayleigh-Taylor instability are investigated to validate the proposed model. The numerical results indicate that the proposed model can accurately describe the complex interface deformation.

Key words: lattice Boltzmann method, phase field, multiphase flow

中图分类号:  (Computational methods in fluid dynamics)

  • 47.11.-j
47.61.Jd (Multiphase flows) 47.11.Qr (Lattice gas)