Questions on the effects of roughness and its analysis in non-equilibrium flows

IF 1.5 4区工程技术 Q3 MECHANICS

Journal of Turbulence Pub Date : 2022-01-03 DOI:10.1080/14685248.2022.2097688

R. Volino, W. Devenport, U. Piomelli

引用次数: 8

Abstract

The prediction of turbulent flows over rough surfaces is important for many applications in engineering and in the natural sciences. Since the resolution of the roughness requires significant computational resources, most modelling approaches rely on the related concepts of ‘equivalent sand-grain roughness’ and ‘wall similarity’. While the validity of these concepts is well established for zero-pressure-gradient boundary-layers and for channel flows, such is not the case for non-equilibrium conditions. This raises a number of important questions, some of which are discussed in this paper. We also suggest some possible paths to answering these questions.

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非平衡流动中粗糙度的影响及其分析问题

粗糙表面湍流的预测在工程和自然科学中的许多应用中都很重要。由于粗糙度的分辨率需要大量的计算资源，大多数建模方法都依赖于“等效砂粒粗糙度”和“壁面相似性”的相关概念。虽然这些概念的有效性在零压力梯度边界层和通道流中得到了很好的证明，但在非平衡条件下却不是这样。这就提出了一些重要问题，本文对其中一些问题进行了讨论。我们还提出了一些可能的途径来回答这些问题。

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.