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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

Effects of grid geometry on non-equilibrium dissipation in grid turbulence

http://hdl.handle.net/2237/26571
http://hdl.handle.net/2237/26571
d3934afe-be60-457e-bb92-7268d920d1eb
名前 / ファイル ライセンス アクション
1_2E4973416.pdf 1_2E4973416.pdf ファイル公開:2018/01/01 (2.6 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2017-06-06
タイトル
タイトル Effects of grid geometry on non-equilibrium dissipation in grid turbulence
言語 en
著者 Nagata, Koji

× Nagata, Koji

WEKO 72152

en Nagata, Koji

Search repository
Saiki, Teppei

× Saiki, Teppei

WEKO 72153

en Saiki, Teppei

Search repository
Sakai, Yasuhiko

× Sakai, Yasuhiko

WEKO 72154

en Sakai, Yasuhiko

Search repository
Ito, Yasumasa

× Ito, Yasumasa

WEKO 72155

en Ito, Yasumasa

Search repository
Iwano, Koji

× Iwano, Koji

WEKO 72156

en Iwano, Koji

Search repository
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 2017 American Institute of Physics. 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. v.29, n.1, 2017, p.015102) and may be found at (http://dx.doi.org/10.1063/1.4973416).
抄録
内容記述 A total of 11 grids in four families, including single- and multi-scale grids, are tested to investigate the development and decay characteristics of grid-generated turbulence. Special attention has been focused on dissipation and non-equilibrium characteristics in the decay region. A wide non-equilibrium region is observed for fractal square grids with three and four iterations. The distributions of the Taylor microscale λ, integral length scale Lu, and dissipation coefficient Cε show that a simple combination of large and small grids does not reproduce elongated non-equilibrium regions as realized by the fractal square grid. On the other hand, a new kind of grid, quasi-fractal grids, in which the region of the smaller fractal elements (N=2–4) of the fractal square grid is replaced by regular grids, successfully reproduce a similar flow field and non-equilibrium nature to that seen in the fractal square grid case. This suggests that the combination of large square grid and inhomogeneously arranged smaller grids produces an elongated non-equilibrium region. The dissipation coefficient Cε is better collapsed using Re0=t0U∞/ν (where t0 is the thickness of the largest grid bar, U∞ the inflow velocity, and ν the kinematic viscosity) as a global/inlet Reynolds number rather than ReM=MU∞/ν (where M is the mesh size) [P. C. Valente and J. C. Vassilicos, “Universal dissipation scaling for non-equilibrium turbulence,” Phys. Rev. Lett. 108, 214503 (2012)].
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
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1063/1.4973416
ISSN
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 29, 号 1, p. 015102-015102, 発行日 2017-01
著者版フラグ
値 publisher
URI
識別子 http://dx.doi.org/10.1063/1.4973416
識別子タイプ DOI
URI
識別子 http://hdl.handle.net/2237/26571
識別子タイプ HDL
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