各向异性对无切变边界层与轴对称应变湍流特性的影响  

Effect of Anisotropy on the Structure of Shear-free Boundary Layer and Axisymmetric Straining Turbulence

作　　者：刘士和[1] 

机构地区：[1]武汉水利电力大学水科所,武汉430072

出　　处：《水动力学研究与进展（A辑）》1995年第1期68-76,共9页Chinese Journal of Hydrodynamics

摘　　要：本文运用湍流快速畸变理论对各向异性条件对无切变边界层及轴对称应变湍流特性的影响进行了探讨。对无切变边界层,所进行的分析与实验资料表明,此时各向异性的影响在于增加纵向紊动强度及减小横向紊动强度,但其对垂向紊动强度影响甚小。对轴对称应变湍流,本文也对紊动强度与雷诺应力随各向异性条件的变化进行了分析。In this paper rapid distortion theory is used to predict the effect of anisotropy on the structure of shear free boundary layer and axisymmetric straining turbulence. For shear-free boundary layer it seems that the effect of anisotropy ios to increase the longitudinal turbulent variances and decrease the lateral turbulent variances and slightly change the vertical turbulent variances. For axisymmetric straining turbulence the effect of anisotropy on turbulent variances and Reynolds shear stress is also analyzed.

关 键 词：边界层 轴对称 湍流 各向异性 粘性流体力学 

分 类 号：O357.52[理学—流体力学]