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采用扩散速度法处理粘性作用项的离散涡方法对混合层流动的发展规律及剪切率对混合层流动发展的影响进行数值模拟。计算结果表明混合层厚度沿流向线性增长 ,混合层流动中大尺度涡结构间的合并是混合层厚度增长的主要因素。混合层厚度及其增长率随剪切率的增加而增大。
The discrete vortex method, which treats the viscous action term by the diffusion velocity method, is used to numerically simulate the law of the development of mixed layer flow and the influence of shear rate on the development of mixed layer flow. The calculated results show that the thickness of the mixed layer increases linearly along the flow direction, and the merging of the large-scale vortex structures in the mixed layer is the main factor of the increase of the mixed layer thickness. The thickness of mixed layer and its growth rate increase with the increase of shear rate.