A turbulence dissipation inhomogeneity scaling in the wake of two side-by-side square prisms

被引：0

作者：

Chen, J.G. ^{[1
]}

Cuvier, C. ^{[1
]}

Foucaut, J.-M. ^{[1
]}

Ostovan, Y. ^{[1
]}

Vassilicos, J.C. ^{[1
]}

机构：

[1] Univ. Lille, CNRS, ONERA, Arts et Metiers Institute of Technology, Centrale Lille, UMR 9014 - LMFL - Laboratoire de Mécanique des Fluides de Lille - Kampé de Fériet, Lille,F-59000, France

来源：

Journal of Fluid Mechanics | 2021年 / 924卷

关键词：

Reynolds number - Turbulence - Prisms - Velocity measurement - Energy dissipation;

D O I：

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中图分类号：

学科分类号：

摘要：

We experimentally study how the turbulent energy dissipation rate scales in the cross-stream direction of turbulent wake flows generated by two side-by-side square prisms. We consider three different such turbulent flows with gap ratios G/H = 1.25, 2.4 and 3.5, where G is the distance between the prisms and H is the prism width. These three flows have a very different dynamics, inhomogeneities and large-scale features. The measurements were taken with a multi-camera particle image velocimetry system at several streamwise locations between 2.5H and 20H downstream of the prisms. After removing the large-scale most energetic coherent structures, the normalised turbulence dissipation coefficient C'ϵ of the remaining incoherent turbulence is found to scale as C'ϵ∼ (√ReL/Re'λ)3/2 along the highly inhomogeneous cross-stream direction for all streamwise locations tested in all three flows and for all three inlet Reynolds numbers considered; Re'ϵ and ReL are, respectively, a Taylor length-based and an integral length-based Reynolds number of the remaining incoherent turbulence. © The Author(s), 2021.

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