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应用格子玻耳兹曼方法对振荡流边界层中单个颗粒在近壁面处的受力进行了三维模拟,计算结果与已有数值模拟结果(雷诺数为300)和实验结果(雷诺数为2000)进行了比较,吻合均较好。计算结果表明,当雷诺数为300时,在振荡流做正反向运动时力系数的幅值变化过程相同,横向涡量的空间分布具有对称性。雷诺数为2000时,紊动增强使力系数在不同流动方向时的变化有所差异,而且横向涡量的分布呈现非对称性,这时颗粒受到横向力作用。
The Lattice Boltzmann method is used to simulate the force near the wall of a single particle in the oscillating flow boundary layer. The calculated results are compared with the numerical results (Reynolds number is 300) and experimental results (Reynolds number is 2000) A comparison is made, all agree better. The calculation results show that when the Reynolds number is 300, the magnitude of the force coefficient changes in the same direction when the oscillating flow makes forward and backward movements, and the spatial distribution of the transverse vorticity is symmetrical. When the Reynolds number is 2000, the variation of the force coefficient in different flow directions is different due to the turbulence enhancement, and the distribution of the lateral vorticity is asymmetrical. At this time, the particles are subjected to the lateral force.