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On the fully coupled dynamics of flexible fibres dispersed in modulated turbulence
https://oist.repo.nii.ac.jp/records/2753
https://oist.repo.nii.ac.jp/records/2753f2b9196f-2ad9-4104-affd-e647dc49683a
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
Olivieri-2022-On the fully coupled dynamics of (3.4 MB)
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CC BY 4.0
Creative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/) |
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2022-08-18 | |||||
| タイトル | ||||||
| タイトル | On the fully coupled dynamics of flexible fibres dispersed in modulated turbulence | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 主題Scheme | Other | |||||
| 主題 | particle/fluid flow | |||||
| 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（英） |
Olivieri, Stefano
× Olivieri, Stefano× Mazzino, Andrea× Rosti, Marco E. |
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| 書誌情報 |
en : Journal of Fluid Mechanics 巻 946, p. A34, 発行日 2022-08-09 |
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| 抄録 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | The present work investigates the mechanical behaviour of finite-size, elastic and inertial fibres freely moving in a homogeneous and isotropic turbulent flow at moderate Reynolds number. Four-way coupled, direct numerical simulations, based on a finite difference discretisation and the immersed boundary method, are performed to mutually couple the dynamics of fibres and fluid turbulence, allowing us to account for the backreaction of the dispersed phase to the carrier flow. An extensive parametric study is carried out in zero-gravity condition over the characteristic properties of the suspension, i.e. fibre's linear density (from iso-dense to denser-than-the-fluid fibres), length (from short fibres comparable with the dissipative scale to long fibres comparable with the integral scale) and bending stiffness (from highly flexible to almost rigid fibres), as well as the concentration (from dilute to non-dilute suspensions). Results reveal the existence of a robust turbulence modulation mechanism that is primarily controlled by the mass fraction of the suspension (with only a minor influence of the fibre's bending stiffness), which is characterised in detail by means of a scale-by-scale analysis in Fourier space. Despite such alteration with respect to the single-phase case due to the non-negligible backreaction, fibres experience only two possible flapping states (previously identified in the very dilute condition) while being transported and deformed by the flow. In addition, we show that the maximum curvature obeys different scaling laws that can be derived from the fibre dynamical equation. Finally, we explore the clustering and preferential alignment of fibres within the flow, highlighting the peculiar role of inertia and elasticity. | |||||
| 出版者 | ||||||
| 出版者 | Cambridge University Press | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0022-1120 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1469-7645 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1017/jfm.2022.611 | |||||
| 権利 | ||||||
| 権利情報 | © 2022 The Author(s) | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/on-the-fully-coupled-dynamics-of-flexible-fibres-dispersed-in-modulated-turbulence/EB3BC13000F409CFDC6407653A3F2992 | |||||
| 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 | |||||
