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Small-scale statistics of passive scalar fluctuations under a uniform mean scalar gradient in turbulence
http://hdl.handle.net/2237/0002013186
http://hdl.handle.net/2237/00020131867a235a52-f0b7-4574-b6cb-615d53971147
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
PRF_649x-2szl.pdf (537 KB)
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| アイテムタイプ | itemtype_ver1(1) | |||||||||
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| 公開日 | 2025-08-25 | |||||||||
| タイトル | ||||||||||
| タイトル | Small-scale statistics of passive scalar fluctuations under a uniform mean scalar gradient in turbulence | |||||||||
| 言語 | en | |||||||||
| 著者 |
Yoshimatsu, Katsunori
× Yoshimatsu, Katsunori
× Kaneda, Yukio
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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 | ||||||||||
| 権利情報 | © 2025 American Physical Society | |||||||||
| 言語 | en | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | Small-scale statistics of the passive scalar field convected by turbulent flow of an incompressible fluid under a uniform mean scalar gradient are studied theoretically and numerically. The flow is assumed to be statistically homogeneous and isotropic. Attention is given to the effects of the mean scalar gradient on the anisotropy of the statistics, in particular, the anisotropy of the second- and third-order mixed velocity-scalar structure functions, <δujδψ> and <δuj (δψ)^2>, where uj (x, t) ( j = 1, 2, 3) is the jth component of the velocity field, ψ(x, t) is the fluctuating part of the scalar field, δξ = ξ (x + r, t) − ξ(x, t), ξ = ψ, uj , <·> is the ensemble average, x is the position, and t is time. A theory of the effects is proposed by extending the idea of the linear response theory of turbulence. Its predictions are examined by direct numerical simulation (DNS) in a periodic box. In the DNS, the Schmidt number is unity, and the Taylor microscale Reynolds number is about 260 at a fully developed state of the turbulent velocity field. It is found that the predictions of the anisotropy are generally consistent with the DNS results. | |||||||||
| 言語 | en | |||||||||
| 出版者 | ||||||||||
| 出版者 | American Physical Society | |||||||||
| 言語 | en | |||||||||
| 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/10.1103/649x-2szl | |||||||||
| 収録物識別子 | ||||||||||
| 収録物識別子タイプ | EISSN | |||||||||
| 収録物識別子 | 2469-990X | |||||||||
| 書誌情報 |
en : Physical Review Fluids 巻 10, 号 6, p. 064613, 発行日 2025-06-13 |
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