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A data-driven model based on modal decomposition: application to the turbulent channel flow over an anisotropic porous wall
https://oist.repo.nii.ac.jp/records/2627
https://oist.repo.nii.ac.jp/records/2627a3e0f9c6-b1f1-4d85-a11e-1b1e931167d8
名前 / ファイル | ライセンス | アクション |
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Le Clainche-2022-A data-driven model based on (1.8 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 | 2022-04-21 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | A data-driven model based on modal decomposition: application to the turbulent channel flow over an anisotropic porous wall | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | turbulence modelling | |||||
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) |
Le Clainche, S.
× Le Clainche, S.× Rosti, M.E.× Brandt, L. |
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書誌情報 |
en : Journal of Fluid Mechanics 巻 939, 発行日 2022-03-23 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | This article presents a data-driven model based on modal decomposition, applied to approximate the low-order statistics of the spatially averaged wall-shear stress in a turbulent channel flow over a porous wall with two anisotropic permeabilities, producing drag increase or reduction when compared with the case of an isotropic porous wall. The model is comparable to a neural network architecture using a linear map to a classification. To create this model, we use high-order dynamic mode decomposition (DMD) to identify the structures describing the main flow dynamics, and then test different linear combinations of these modes to estimate the time evolution of the stress at the porous interface. The coefficients of the model are obtained by training the model against the results of direct numerical simulations over different time intervals. Depending on the number and the way of combining the DMD modes, the reduced-order models presented can reconstruct the wall-shear stress with relative error smaller than 0.01 % and reproduce its statistical variations for at least 1500 time units with relative error in the standard deviation or the mean smaller than 5 %. The model has also been tested to approximate the statistics of the wall-shear stress over the whole wall, showing that the regeneration of the flow structures can be reproduced by the nonlinear interaction of modes. Finally, considering the DMD modes as communities in a neural network, we examine the influence of the mode-to-mode interaction on the nonlinear flow dynamics, which explains the performance of the different models. | |||||
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.2022.159 | |||||
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/datadriven-model-based-on-modal-decomposition-application-to-the-turbulent-channel-flow-over-an-anisotropic-porous-wall/0C9E575F25ACD7CDB637190707559C47 | |||||
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 |