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Passive scalar spectrum in the viscous-convective range in two-dimensional steady turbulence
https://nitech.repo.nii.ac.jp/records/4767
https://nitech.repo.nii.ac.jp/records/4767394621a5-09e2-462f-bf31-5a0888eaebc8
名前 / ファイル | ライセンス | アクション |
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本文_fulltext (186.2 kB)
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Copyright (2000) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.The following article appeared in Physics of Fluids, 12(1), pp.155- 168 ; 2000 and may be found at http://link.aip.org/link/?phf/12/155
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2012-11-07 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Passive scalar spectrum in the viscous-convective range in two-dimensional steady turbulence | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Gotoh, Toshiyuki
× Gotoh, Toshiyuki× Nagaki, Junji× Kaneda, Yukio |
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著者別名 | ||||||
姓名 | 後藤, 俊幸 | |||||
書誌情報 |
PHYSICS OF FLUIDS 巻 12, 号 1, p. 155-168, 発行日 2000-01 |
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出版者 | ||||||
出版者 | American Institute of Physics | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 10706631 | |||||
書誌レコードID(NCID) | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10986202 | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | The spectrum of a passive scalar field in the viscous-convective range convected by two-dimensional steady turbulence was studied using the Lagrangian Renormalized Approximation (LRA) and high resolution DNS with a resolution up to 40962. It was found that the scalar spectrum F(k) using the LRA scales as k-1 in the range, and decays Gaussianly in the far diffusive range, and these wavenumber dependencies in both ranges agree with the DNS data. A new Lagrangian closure approximation that is invariant under random Galilean transformation and random uniform rotation is proposed. The approximation makes better quantitative predictions than the LRA and yields F(k) = CVC(ν/)1/2k-1 with CVC = 5.25 in the viscous-convective range, which is in good agreement with the DNS value CVC = 5.11. The importance of molecular diffusion in the far diffusive range when the viscous-convective range exists is also discussed. | |||||
フォーマット | ||||||
内容記述タイプ | Other | |||||
内容記述 | application/pdf |