流动湍流产生托尔米安-施利克廷波的数值模拟

IF 1 4区 工程技术 Q4 MECHANICS
M. V. Ustinov
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引用次数: 0

摘要

摘要 研究了突然运动的平板上剪切层中外部湍流产生的扰动。以各向同性均质湍流发展的直接数值模拟所发现的湍流作为初始条件。当过渡是由 Tollmien-Schlichting 波引起时,所得到的解模拟了相对较低的自由流湍流条件下平板上边界层的层流-湍流过渡。该求解可以描述各种扰动(即低频条纹结构和不稳定波)的产生过程,以及它们在层流-湍流过渡初始阶段的发展情况。在对所获结果进行处理的基础上,提出了一个将边界层中的不稳定波频谱与自由流中的湍流脉动联系起来的简单模型。此外,还获得了不稳定波的初始振幅及其临界放大系数(N 因子)对流动湍流程度的依赖关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Numerical Simulation of Tollmien–Schlichting Wave Generation by Flow Turbulence

Numerical Simulation of Tollmien–Schlichting Wave Generation by Flow Turbulence

Numerical Simulation of Tollmien–Schlichting Wave Generation by Flow Turbulence

The disturbances generated by external turbulence in the shear layer on a flat plate suddenly set in motion are found. As the initial conditions, turbulent flow found using direct numerical simulation of the development of isotropic homogeneous turbulence is used. The solution obtained models laminar-turbulent transition in the boundary layer on a flat plate under relatively low free-stream turbulence when the transition is caused by Tollmien–Schlichting waves. The solution makes it possible to describe the process of generating various disturbances, namely, low-frequency streaky structures and instability waves and also their development in the initial stage of laminar-turbulent transition. Based on the processing of the obtained results, a simple model is proposed that relates the spectra of instability waves in the boundary layer and turbulent pulsations in free-stream flow. The dependences of the initial amplitude of instability waves and their critical amplification factors (N-factors) on the degree of flow turbulence are also obtained.

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来源期刊
Fluid Dynamics
Fluid Dynamics MECHANICS-PHYSICS, FLUIDS & PLASMAS
CiteScore
1.30
自引率
22.20%
发文量
61
审稿时长
6-12 weeks
期刊介绍: Fluid Dynamics is an international peer reviewed journal that publishes theoretical, computational, and experimental research on aeromechanics, hydrodynamics, plasma dynamics, underground hydrodynamics, and biomechanics of continuous media. Special attention is given to new trends developing at the leading edge of science, such as theory and application of multi-phase flows, chemically reactive flows, liquid and gas flows in electromagnetic fields, new hydrodynamical methods of increasing oil output, new approaches to the description of turbulent flows, etc.
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