Lattice Boltzmann simulation of a laminar square jet in cross flows

doi:10.1016/j.cjche.2016.03.008

Abstract

Abstract: A three-dimensional, nineteen-velocity (D3Q19) Lattice BoltzmannMethod (LBM) modelwas developed to simulate the fluid flow of a laminar square jet in cross flows based on the single relaxation time algorithm. The code was validated by the mathematic solution of the Poiseuille flow in a square channel, and was further validated with a previouswell studied empirical correlation for the central trajectory of a jet in cross flows. The developed LBM model was found to be able to capture the dominant vortex, i.e. the Counter-rotating Vortex Pair (CVP) and the upright wake vortex. Results show that the incoming fluid in the cross flow channel was entrained into the leeside of the jet fluid, which contributes to the blending of the jet. That the spread width of the transverse jet decreaseswith the velocity ratio. A layer-organized entrainment pattern was found indicating that the incoming fluid at the lower position is firstly entrained into the leeside of the jet, and followed by the incoming fluid at the upper position.

Key words: Lattice Boltzmann method, Square jet, Cross flow, Laminar flow

摘要： A three-dimensional, nineteen-velocity (D3Q19) Lattice BoltzmannMethod (LBM) modelwas developed to simulate the fluid flow of a laminar square jet in cross flows based on the single relaxation time algorithm. The code was validated by the mathematic solution of the Poiseuille flow in a square channel, and was further validated with a previouswell studied empirical correlation for the central trajectory of a jet in cross flows. The developed LBM model was found to be able to capture the dominant vortex, i.e. the Counter-rotating Vortex Pair (CVP) and the upright wake vortex. Results show that the incoming fluid in the cross flow channel was entrained into the leeside of the jet fluid, which contributes to the blending of the jet. That the spread width of the transverse jet decreaseswith the velocity ratio. A layer-organized entrainment pattern was found indicating that the incoming fluid at the lower position is firstly entrained into the leeside of the jet, and followed by the incoming fluid at the upper position.

关键词: Lattice Boltzmann method, Square jet, Cross flow, Laminar flow

Guoneng Li, Youqu Zheng, Huawen Yang, Wenwen Guo, Yousheng Xu. Lattice Boltzmann simulation of a laminar square jet in cross flows[J]. Chin.J.Chem.Eng., 2016, 24(11): 1505-1512.

Guoneng Li, Youqu Zheng, Huawen Yang, Wenwen Guo, Yousheng Xu. Lattice Boltzmann simulation of a laminar square jet in cross flows[J]. Chinese Journal of Chemical Engineering, 2016, 24(11): 1505-1512.

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