确定性切变与大尺度随机应变对湍流小尺度结构的作用

Effect of Deterministic Mean Shear and Random Straining Motion on Small-scale Turbulent Structures

本文用确定性切变模拟时均流动的作用,用大尺度随机应变反映大尺度相干结构中无旋部分的作用,对时均流动与大尺度相干结构对小尺度结构的作用进行了探讨,并分析了在应变率与切变率较小的情况下小尺度结构的湍能及雷诺应力的变化趋势.

In this paper the effect of mean shear and large-scale coherent structures on the small-scall turbu-lent structures is studied with a model problem, and the variation of turbulent energy and Reynolds' Shear stress is also analyzed for small mean shear rate and small straining rate.