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Direct numerical simulation of the turbulent kinetic energy and energy dissipation rate in a cylinder wake

Published online by Cambridge University Press:  02 August 2022

Hongyi Jiang Open the ORCID record for Hongyi Jiang [Opens in a new window] ,
Xiaoyuan Hu ,
Liang Cheng  and
Tongming Zhou
Hongyi Jiang
Affiliation:
School of Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
Xiaoyuan Hu
Affiliation:
School of Marine Science and Engineering, Guangzhou International Campus, South China University of Technology, Guangzhou 511442, PR China
Liang Cheng*
Affiliation:
School of Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia School of Marine Science and Engineering, Guangzhou International Campus, South China University of Technology, Guangzhou 511442, PR China
Tongming Zhou
Affiliation:
School of Engineering, The University of Western Australia, 35 Stirling Highway, Perth, WA 6009, Australia
*
†Email address for correspondence: liang.cheng@uwa.edu.au
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Abstract

The turbulent kinetic energy and energy dissipation rate in the wake of a circular cylinder are examined at a Reynolds number of 1000. The turbulence characteristics are quantified using direct numerical simulation, which provides a comprehensive dataset that is almost impossible to acquire from physical experiments. The energy dissipation rate is decomposed into the components due to the mean flow, the coherent primary vortices and the remainder. It is found that the remainder component, which develops only in a three-dimensional turbulent wake and resides mainly in the regions of vortices, accounts for 95 % and 97 % of the total dissipation rate for 10 and 20 cylinder diameters downstream of the cylinder, respectively (while the remainder accounts for 62 % and 83 % of the total turbulent kinetic energy). Based on the remainder component, the validity of local isotropy, local axisymmetry, local homogeneity and homogeneity in the y–z plane for the turbulent dissipation in the wake is examined. The analysis reveals that the turbulent dissipation is largely locally homogeneous, but not locally isotropic or axisymmetric, even after the annihilation of the primary vortex street. In addition, the performances of the four corresponding surrogates to the true dissipation rate are evaluated. Owing to the general validity of local homogeneity, the surrogates of local homogeneity and homogeneity in the y–z plane perform well. Although local axisymmetry does not hold, the corresponding surrogate performs well, because errors from different terms largely cancel out. However, the surrogate of local isotropy generally underestimates the true dissipation rate.

JFM classification

Wakes/Jets: Wakes Wakes/Jets: Vortex streets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 946 , 10 September 2022 , A11
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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