Reflections on roughness modelling in turbulent flow

IF 1.5 4区工程技术 Q3 MECHANICS

Journal of Turbulence Pub Date : 2022-10-23 DOI:10.1080/14685248.2022.2137171

P. Durbin

引用次数: 0

Abstract

The general topic of practical modelling of roughness in turbulent flow is discussed. Double averaging is a useful framework, but most models cannot be construed as term-by-term closures to the double averaged equations. Double averaging justifies a drag representation. Drag models are effective for both Reynolds averaged and eddy resolving simulation. Boundary condition models are primarily viable for Reynolds averaged closure. Those models are calibrated with the Hama roughness function for the log-law. But a perplexing observation is that the VonKarman constant depends on roughness height.

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湍流中粗糙度建模的几点思考

讨论了湍流中粗糙度实际建模的一般问题。双平均是一个有用的框架，但大多数模型不能被解释为双平均方程的逐项闭包。双重平均证明了拖拽表示的合理性。阻力模型对雷诺平均模拟和涡解析模拟都是有效的。边界条件模型主要适用于雷诺平均闭包。这些模型用哈马粗糙函数对对数律进行校准。但一个令人困惑的观察结果是，冯卡门常数取决于粗糙度的高度。

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

Journal of Turbulence 物理-力学

CiteScore

3.90

自引率

5.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Turbulence is a physical phenomenon occurring in most fluid flows, and is a major research topic at the cutting edge of science and technology. Journal of Turbulence ( JoT) is a digital forum for disseminating new theoretical, numerical and experimental knowledge aimed at understanding, predicting and controlling fluid turbulence. JoT provides a common venue for communicating advances of fundamental and applied character across the many disciplines in which turbulence plays a vital role. Examples include turbulence arising in engineering fluid dynamics (aerodynamics and hydrodynamics, particulate and multi-phase flows, acoustics, hydraulics, combustion, aeroelasticity, transitional flows, turbo-machinery, heat transfer), geophysical fluid dynamics (environmental flows, oceanography, meteorology), in physics (magnetohydrodynamics and fusion, astrophysics, cryogenic and quantum fluids), and mathematics (turbulence from PDE’s, model systems). The multimedia capabilities offered by this electronic journal (including free colour images and video movies), provide a unique opportunity for disseminating turbulence research in visually impressive ways.