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The Turbulent Flow over the BARC Rectangular Cylinder: A DNS Study
Flow, Turbulence and Combustion ( IF 2.4 ) Pub Date : 2021-05-13 , DOI: 10.1007/s10494-021-00254-1
Alessandro Chiarini , Maurizio Quadrio

A direct numerical simulation (DNS) of the incompressible flow around a rectangular cylinder with chord-to-thickness ratio 5:1 (also known as the BARC benchmark) is presented. The work replicates the first DNS of this kind recently presented by Cimarelli et al. (J Wind Eng Ind Aerodyn 174:39–495, 2018), and intends to contribute to a solid numerical benchmark, albeit at a relatively low value of the Reynolds number. The study differentiates from previous work by using an in-house finite-differences solver instead of the finite-volumes toolbox OpenFOAM, and by employing finer spatial discretization and longer temporal average. The main features of the flow are described, and quantitative differences with the existing results are highlighted. The complete set of terms appearing in the budget equation for the components of the Reynolds stress tensor is provided for the first time. The different regions of the flow where production, redistribution and dissipation of each component take place are identified, and the anisotropic and inhomogeneous nature of the flow is discussed. Such information is valuable for the verification and fine-tuning of turbulence models in this complex separating and reattaching flow.



中文翻译:

BARC矩形圆柱上的湍流:DNS研究

提出了弦与壁厚比为5:1的矩形圆柱体周围不可压缩流的直接数值模拟(DNS)(也称为BARC基准)。该工作复制了Cimarelli等人最近提出的第一个此类DNS。(J Wind Eng Ind Aerodyn 174:39–495,2018年),尽管雷诺数的值相对较低,但它打算为稳固的数值基准做出贡献。这项研究通过使用内部有限差分求解器而不是有限体积工具箱OpenFOAM,并采用更精细的空间离散化和更长的时间平均,与之前的工作有所不同。描述了流程的主要特征,并突出显示了与现有结果的数量差异。首次提供了出现在预算方程中有关雷诺应力张量分量的完整术语集。确定了发生流动,产生每个成分的再分布和耗散的不同区域,并讨论了流动的各向异性和非均质性。这些信息对于在这种复杂的分离和重新附着流中验证和微调湍流模型非常有价值。

更新日期:2021-05-13
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