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Characteristics of large-scale and superstructure motions in a turbulent boundary layer overlying complex roughness
https://oist.repo.nii.ac.jp/records/1046
https://oist.repo.nii.ac.jp/records/10462729c022-4753-446d-9896-4aee079eefae
名前 / ファイル | ライセンス | アクション |
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Roughness_SpectraAnalysis_Paper_JOT_Accepted (11.8 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2019-07-30 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Characteristics of large-scale and superstructure motions in a turbulent boundary layer overlying complex roughness | |||||
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) |
Barros, Julio M.
× Barros, Julio M.× Christensen, Kenneth T. |
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書誌情報 |
en : Journal of Turbulence 巻 20, 号 2, p. 147-173, 発行日 2019-03-19 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | The structural attributes of turbulent flow over a complex roughness topography are explored using high-frame-rate stereo particle-image velocimetry measurements in the wall-normal–spanwise plane. The roughness under consideration was replicated from a turbine blade damaged by deposition of foreign materials and contains a broad range of topographical scales arranged in a highly irregular manner. Previous results from Barros and Christensen [Observations of turbulent secondary flows in a rough-wall boundary layer. J Fluid Mech. 2014;748] revealed strong spanwise heterogeneity in the flow attributed to the formation of roughness-induced turbulent secondary flows identified by spanwise-alternating low- and high-momentum flow pathways (HMP & LMP, respectively) in the mean flow marked by enhanced Reynolds stresses and turbulent kinetic energy. Frequency spectra of streamwise velocity at fixed wall-normal location presented herein also display strong dependence on spanwise position. In particular, the roughness promotes enhanced energy content of the large-scale and smaller-scale motions (as opposed to very-large-scale ones). Depending on spanwise position, pre-multiplied spectra highlight significant modification of the energy content of the very large-scale motions (superstructures) due to roughness compared to smooth-wall flow. Of note, a shift in both TKE and RSS content to shorter streamwise scales at an LMP was noted, while less of an impact was found coincident with an HMP. | |||||
出版者 | ||||||
出版者 | Taylor & Francis | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1468-5248 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1080/14685248.2019.1595634 | |||||
権利 | ||||||
権利情報 | © 2019 Taylor and Francis Group | |||||
権利 | ||||||
権利情報 | This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Turbulence on 19/03/2019, available online: http://www.tandfonline.com/10.1080/14685248.2019.1595634. | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://www.tandfonline.com/doi/abs/10.1080/14685248.2019.1595634 | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa |