Direct Numerical Simulations of turbulent channel flow roughened with 2D triangular bars: On the Effective Distribution parametrization

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2025-08-28 DOI:10.1016/j.ijheatfluidflow.2025.110015

Federica Bruno , Mauro De Marchis , Stefano Leonardi

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Abstract

Turbulent flows over rough surfaces are a common phenomenon in engineering applications, yet predicting how the roughness affects the turbulent flow remains a challenge. In the present paper, we expand the results of Bruno et al. (2024) on the new geometrical parameter, the Effective Distribution (ED). Specifically, the effect of roughness on turbulent intensities has been investigated. The ED demonstrates improved correlations with both drag and roughness function across a wide range of surface configurations, including irregular rough surfaces generated by random sinusoidal functions. A detailed analysis of the ED equation reveals that the contributions of higher pinnacles and the spacing between roughness elements, play a dominant role in capturing the impact of roughness on drag and turbulent intensities. To investigate this issue, a detailed analysis of turbulent intensities modification induced by the roughness is performed, thus showing the highest pinnacle’s role. These results emphasize the importance of considering these terms in the parametrization of rough surfaces.

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二维三角杆粗化湍流通道流动的直接数值模拟：关于有效分布参数化的研究

在工程应用中，粗糙表面上的湍流是一种常见的现象，但如何预测粗糙度对湍流的影响仍然是一个挑战。在本文中，我们扩展了Bruno et al.（2024）关于新的几何参数有效分布（ED）的结果。具体来说，粗糙度对湍流强度的影响已经进行了研究。在各种表面结构中，包括由随机正弦函数生成的不规则粗糙表面，ED与阻力和粗糙度函数的相关性都得到了改善。对ED方程的详细分析表明，在捕捉粗糙度对阻力和湍流强度的影响时，高尖峰的贡献和粗糙度单元之间的间距起着主导作用。为了研究这一问题，对粗糙度引起的湍流强度变化进行了详细的分析，从而揭示了最高尖峰的作用。这些结果强调了在粗糙表面参数化中考虑这些项的重要性。

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

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.