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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Energy dissipation and enstrophy production/destruction at very low Reynolds numbers in the final stage of the transition period of decay in grid turbulence

http://hdl.handle.net/2237/0002001584
http://hdl.handle.net/2237/0002001584
4e47e632-debe-4aae-a297-6b5b62793277
名前 / ファイル ライセンス アクション
5_0041929.pdf 5_0041929.pdf (2.3 MB)
Item type itemtype_ver1(1)
公開日 2021-11-10
タイトル
タイトル Energy dissipation and enstrophy production/destruction at very low Reynolds numbers in the final stage of the transition period of decay in grid turbulence
言語 en
著者 Zheng, Y.

× Zheng, Y.

en Zheng, Y.

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Nagata, K.

× Nagata, K.

en Nagata, K.

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Watanabe, T.

× Watanabe, T.

en Watanabe, T.

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 Copyright 2021 Author(s). Published under an exclusive license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.The following article appeared in (Physics of Fluids 33, 035147 (2021)) and may be found at (https://doi.org/10.1063/5.0041929).
内容記述
内容記述 Decay characteristics of turbulent kinetic energy and enstrophy in grid turbulence have been investigated in the far downstream region (𝑥/𝑀∼103: x is the downstream distance from the grid, M is the mesh size of the grid) through wind tunnel experiments using hot-wire anemometry, with the lowest turbulent Reynolds number 𝑅𝑒𝜆≈5. The non-dimensional dissipation rate 𝐶𝜀 increases rapidly toward the final stage of the transition period of decay and the profile agrees well with previous direct numerical simulation [W. D. McComb et al., “Taylor's (1935) dissipation surrogate reinterpreted,” Phys. Fluids 22, 061704 (2010)] and theoretical estimation [D. Lohse, “Crossover from high to low Reynolds number turbulence,” Phys. Rev. Lett. 73, 3223 (1994)] at very low 𝑅𝑒𝜆 in decaying and stationary isotropic turbulence. The present result of 𝐶𝜀 is an update on the experimental data in grid turbulence toward a very low 𝑅𝑒𝜆, where measurements have been absent. The energy spectrum in the dissipation range at very low 𝑅𝑒𝜆 deviates from a universal form observed at high Reynolds numbers. The decay rate of enstrophy is proportional to 𝑆+2𝐺/𝑅𝑒𝜆 (S is the skewness of the longitudinal velocity derivative and G is the destruction coefficient). It is shown that G and 𝑆+2𝐺/𝑅𝑒𝜆 increase rapidly with decreasing 𝑅𝑒𝜆 at very low 𝑅𝑒𝜆, indicating that the effect of enstrophy destruction is dominant in the final stage of the transition period of decay. The profiles of 𝑆+2𝐺/𝑅𝑒𝜆 against 𝑅𝑒𝜆 is well fitted by a power-law function even in the final stage of the transition period of decay.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 AIP Publishing
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
関連情報
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1063/5.0041929
収録物識別子
収録物識別子タイプ PISSN
収録物識別子 1070-6631
書誌情報 en : Physics of Fluids

巻 33, 号 3, p. 035147, 発行日 2021-03-23
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日付 2022-03-23
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