旋涡运动与湍流模型

本文力图将熟知的湍流大涡运动现象与湍流模型理论联系起来以减少模型理论中的经验关系。 在剪切流中以球的流体动力系数,分析确定了涡球的运动,并以此确定剪切流中的湍流剪应力。由此得到了一个二方程模型,方程中仅包含球的流体动力系数。 平板湍流边界层的实例计算表明,计算的速度剖面在整个边界层中都能很好地与实验符合。

THE MOVEMENT OF LARGE SCALE EDDIES IN TURBULENT WALL FLOW AND TURBULENT MODEL

An effort to relate the experimental phenomena of large scale structure in turbulent flow with turbulent model to reduce the empirical relation used in modelling theory has been made.Consider an eddy with a scale;which travels through the shear flow with turbulent velocity u,v.The force acted on it and the movement associated has been analysed.So the data of a sphere (such as drag coefficient...) can be used to predict the movement of a vortex sphere and the turbulence and turbulent shear stress in shear flow.A two-equation model has been derived from this analysis.And the coefficients and functions involved in these equations only rely on the fluid dynamic coefficient of a sphere.A calculation of the boundary layer of a plate shows a satisfied agreement with experimental data of the velocity profile in inner region of the boundary as well as in the outer layer.