Mixing in the planar turbulent wakes in passively stratified medium

IF 0.5 4区工程技术 Q4 ENGINEERING, AEROSPACE

Thermophysics and Aeromechanics Pub Date : 2026-06-09 DOI:10.1134/S086986432505004X

A. G. Demenkov, G. G. Chernykh

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Abstract

The flow pattern in the planar turbulent far wake past a body in a passively stratified medium is investigated by applying a mathematical model including the following features: Rodi’s algebraic approximations for Reynolds stresses, the differential equation for transfer of a defect of the mean velocity longitudinal component, the balance of the turbulence energy and its dissipation rate, fluid mean density defect, vertical component of the mass flux vector, and the equation for variance of the turbulent fluctuations of density transfer. The far wake approximation is taken for this problem. The paper discusses an issue of the local-equilibrium truncation taken for the two last equations. We compare the solutions of self-similar degeneration of the density field characteristics for a case of a classical turbulent wake behind a towed cylinder and for a case of momentumless turbulent wake. The results of numerical experiments were a foundation for interpreting the observed significant error while using the locally-equilibrium truncation of equation for the density fluctuations variance transfer.

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被动分层介质中平面湍流尾迹的混合

本文应用包含以下特征的数学模型研究了被动分层介质中平面湍流远尾迹经过物体时的流型：Reynolds应力的Rodi代数近似，平均速度纵向分量的缺陷传递微分方程，湍流能量及其耗散率的平衡，流体平均密度缺陷，质量通量矢量的垂直分量，以及密度传递湍流波动方差方程。对该问题采用远尾迹近似。本文讨论了最后两个方程的局部平衡截断问题。我们比较了拖曳圆柱后的经典湍流尾流和无动量湍流尾流的密度场特性的自相似退化解。数值实验结果为用局部平衡截断方程解释密度波动方差传递时观测到的显著误差提供了基础。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thermophysics and Aeromechanics THERMODYNAMICS-MECHANICS

CiteScore

0.90

自引率

40.00%

发文量

审稿时长

>12 weeks

期刊介绍： The journal Thermophysics and Aeromechanics publishes original reports, reviews, and discussions on the following topics: hydrogasdynamics, heat and mass transfer, turbulence, means and methods of aero- and thermophysical experiment, physics of low-temperature plasma, and physical and technical problems of energetics. These topics are the prior fields of investigation at the Institute of Thermophysics and the Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences (SB RAS), which are the founders of the journal along with SB RAS. This publication promotes an exchange of information between the researchers of Russia and the international scientific community.