计算物理 ›› 2018, Vol. 35 ›› Issue (4): 405-412.DOI: 10.19596/j.cnki.1001-246x.7658

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考虑Soret和Dufour效应的方腔内双扩散自然对流格子Boltzmann模拟

王俊, 娄钦, 徐洪涛, 陈建, 杨茉   

  1. 上海理工大学能源与动力工程学院, 上海 200093
  • 收稿日期:2017-03-16 修回日期:2017-06-02 出版日期:2018-07-25 发布日期:2018-07-25
  • 通讯作者: 徐洪涛,副教授,E-mail:htxu@usst.edu.cn
  • 作者简介:王俊(1993-),男,硕士研究生,主要从事传热传质及数值模拟技术研究,E-mail:1165606063@qq.com
  • 基金资助:
    国家自然科学基金(51406120)资助项目

Lattice Boltzmann Simulation of Double Diffusive Natural Convection in an Enclosure with Soret and Dufour Effects

WANG Jun, LOU Qin, XU Hongtao, CHEN Jian, YANG Mo   

  1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2017-03-16 Revised:2017-06-02 Online:2018-07-25 Published:2018-07-25

摘要: 采用格子Boltzmann方法,考虑Soret和Dufour效应,对内置高浓度发热圆的方腔内部双扩散自然对流现象进行数值模拟.高浓度发热圆位于方腔中心,四周壁面均为低温低浓度.在该模型中,用三个独立的LBGK方程分别模拟速度场、温度场和浓度场,并通过Boussinesq近似将它们耦合起来.分析Soret数和Dufour数对方腔内部双扩散自然对流的影响,得到流线图、等温线图、等浓度线图、发热圆表面平均Nusselt数和平均Sherwood数.结果表明:Soret和Dufour效应对方腔内双扩散自然对流影响明显,不能忽略.

关键词: 方腔, Soret和Dufour效应, 双扩散自然对流, 格子Boltzmann方法

Abstract: We adopt lattice Boltzmann method to investigate double diffusive natural convection around a heated cylinder in an enclosure with Soret and Dufour effects. The inner heated cylinder is located at center of a square enclosure and four surrounding walls are assumed with low temperature and concentration. In the model, distributions of velocity, temperature and concentration are solved with three independent LBGK equations which are combined into a coupled equation through Boussinesq approximation. Influences of Soret number and Dufour number on double diffusive natural convection are analyzed. Streamlines, isotherms, isoconcentrations, average Nusselt and Sherwood numbers around heated cylinder in enclosure are presented. It shows that Soret and Dufour effects have significant influence on double diffusive natural convection.

Key words: enclosure, Soret and Dufour effects, double diffusive natural convection, lattice Boltzmann method

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