Chinese Journal of Computational Physics ›› 2022, Vol. 39 ›› Issue (4): 427-439.DOI: 10.19596/j.cnki.1001-246x.8447

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Flow Patterns in Three-dimensional Lid-driven Cavities with Curved Boundary: MRT-LBM Study

Qiao-ling ZHANG1, He-fang JING1,2,*()   

  1. 1. School of Mathematics and Information Science, North Minzu University, Yinchuan, Ningxia 750021, China
    2. School of Civil Engineering, North Minzu University, Yinchuan, Ningxia 750021, China
  • Received:2021-09-13 Online:2022-07-25 Published:2022-11-17
  • Contact: He-fang JING

Abstract:

D3Q15 model of multi-relaxation time lattice Boltzmann method(MRT-LBM) is applied to simulate flow in three-dimensional lid-drive cavities with different curved boundaries, including rectangular cavity, cylindrical cavity, semi-cylinder cavity, rotating hyperboloid cavity, ellipsoid cavity, hemisphere cavity and two combined cavities. Streamlines, velocity contours and vortex positions of these cavities are analyzed. Flow characteristics of typical cavities with various Reynolds numbers are compared. It shows that under same Reynolds numbers the curved boundary eliminates the second and third vortices caused by the boundary. It leads to the separation of the main vortex in the cavity and increases the vertical reflux velocity of the central profile. Streamlines of the combined cavity with cuboid up semi-cylinder are fit most with the boundary. As the Reynolds number is increasing, the main vortex in the semi-cylindrical cavity separates gradually into two homodromous vortices, and the basic flow characteristics of the cylindrical cavity and the hemispheric cavity are always maintained in the cavity with cylinder up hemisphere; While the main vortex center in the cuboid cavity remains at the same height, the secondary vortex is gradually enhanced, and the flow in the cavity becomes more and more regular in the combined cavity with cuboid up semi-cylinder, the main vortex gradually sinks, and the flow velocity is smaller at the center and is greater near the boundary in the combined cavity with cuboid up semi-cylinder.

Key words: lattice Boltzmann method, multi-relaxation time, lid-drive, cavity with curved boundary