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Fiber Tracking Velocimetry for Two-Point Statistics of Turbulence
https://oist.repo.nii.ac.jp/records/2304
https://oist.repo.nii.ac.jp/records/23040993e970-e871-484d-a229-93b0c62cf6fc
名前 / ファイル | ライセンス | アクション |
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PhysRevX.11.031060 (1.1 MB)
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Creative Commons Attribution 4.0 International(https://creativecommons.org/licenses/by/4.0/)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2021-09-22 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Fiber Tracking Velocimetry for Two-Point Statistics of 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(英) |
Brizzolara, Stefano
× Brizzolara, Stefano× Rosti, Marco Edoardo× Olivieri, Stefano× Brandt, Luca× Holzner, Markus× Mazzino, Andrea |
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書誌情報 |
en : Physical Review X 巻 11, 号 3, p. 031060, 発行日 2021-09-17 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | We propose and validate a novel experimental technique to measure two-point statistics of turbulent flows. It consists of spreading rigid fibers in the flow and tracking their position and orientation in time and is therefore named “fiber tracking velocimetry.” By choosing different fiber lengths, i.e., within the inertial or dissipative range of scales, the statistics of turbulence fluctuations at the selected length scale can be probed accurately by simply measuring the fiber velocity at its two ends and projecting it along the transverse-to-fiber direction. By means of fully resolved direct numerical simulations and experiments, we show that these fiber-based transverse velocity increments are statistically equivalent to the (unperturbed) flow transverse velocity increments. Moreover, we show that the turbulent energy-dissipation rate can be accurately measured exploiting sufficiently short fibers. The technique is tested against standard particle tracking velocimetry (PTV) of flow tracers with excellent agreement. Our technique overcomes the well-known problem of PTV to probe two-point statistics reliably because of the fast relative diffusion in turbulence that prevents the mutual distance between particles to remain constant at the length scale of interest. This problem, making it difficult to obtain converged statistics for a fixed separation distance, is even more dramatic for natural flows in open domains. A prominent example is oceanic currents, where drifters (i.e., the tracer-particle counterpart used in field measurements) disperse quickly, but at the same time their number has to be limited to save costs. Inspired by our laboratory experiments, we propose pairs of connected drifters as a viable option to solve the issue. | |||||
出版者 | ||||||
出版者 | American Physical Society | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 2160-3308 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1103/PhysRevX.11.031060 | |||||
権利 | ||||||
権利情報 | © American Physical Society | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://journals.aps.org/prx/abstract/10.1103/PhysRevX.11.031060 | |||||
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 |