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Variational Approach to a Turbulent Swirling Pipe Flow with the Aid of Helicity
http://hdl.handle.net/10655/3190
http://hdl.handle.net/10655/3190479ffcfb-5491-4f43-91d9-2e4489091e9b
Item type | 研究報告書 / Research Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Variational Approach to a Turbulent Swirling Pipe Flow with the Aid of Helicity | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | turbulent swirling flow | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | variational method | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | helicity | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | turbulent-energy production | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | reversal of pipe flow | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
"Yoshizawa, A.
× "Yoshizawa, A.× Yokoi, N.× Nisizima, S.× Itoh, S.-I.× Itoh, K." |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "A turbulent swirling flow in a circular pipe is studied with the aid of a variational method. The turbulent-energy production effect, which is linked with spatial velocity gradients, expresses the energy cascade from mean to turbulent components of motion and is a cause of the loss of distinct mean-flow structures. In the turbulent-energy equation, weakening of the production effect tends to enhance the diffusion effect of turbulent energy, which is also harmful to the sustainment of such structures. An optimum state in which these two effects are reconciled with each other is sought with resort to a variational approach combined with helicity. The resulting state is expressed by the mean vorticity proportional to its curl. On this basis, the centerline axial vorticity is shown to play a central role in the occurrence of axial-velocity retardation or reversal in a turbulent swirling pipe flow." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 2001-02-01 |
|||||
報告書番号 | ||||||
NIFS-680 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |