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  1. 防災科研関係論文

18pCW-10 大規模直接数値シミュレーションによる乱流のエネルギースペクトル

https://nied-repo.bosai.go.jp/records/6395
https://nied-repo.bosai.go.jp/records/6395
45d274c5-c4ae-4120-a19a-1ff94776b862
Item type researchmap(1)
公開日 2023-09-20
タイトル
言語 ja
タイトル 18pCW-10 大規模直接数値シミュレーションによる乱流のエネルギースペクトル
タイトル
言語 en
タイトル 18pCW-10 Energy spectrum in high-resolution direct numerical simulations of turbulence
言語
言語 jpn
著者 石原 卓

× 石原 卓

ja 石原 卓

en Ishihara T.

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森下 浩二

× 森下 浩二

ja 森下 浩二

en Morishita K.

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横川 三津夫

× 横川 三津夫

ja 横川 三津夫

en Yokokawa M.

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宇野 篤也

× 宇野 篤也

ja 宇野 篤也

en Uno A.

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金田 行雄

× 金田 行雄

ja 金田 行雄

en Kaneda Y.

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抄録
内容記述タイプ Other
内容記述 A study is made about the energy spectrum E(k) of turbulence on the basis of high-resolution direct numerical simulations (DNSs) of forced incompressible turbulence in a periodic box using a Fourier spectral method with the number of grid points and the Taylor scale Reynolds number Rλ up to 122883 and approximately 2300, respectively. The DNS data show that there is a wave-number range (approximately 5×10?3<kη<2×10?2) in which E(k) fits approximately well to Kolmogorov's k?5/3 scaling, where η is the Kolmogorov length scale. However, a close inspection shows that the exponent is a little smaller than ?5/3, and E(k) in the range fits to E(k)/[?ε?2/3k?5/3]=c(kL)m, where ?ε? is the mean energy dissipation rate per unit mass; L is the integral length scale; and m??0.12. The coefficient c is independent of k, but has a Rλ dependence, such as c=CRζλ, where C?0.9 and ζ?0.14.
言語 en
書誌情報 ja : 日本物理学会講演概要集
en : Meeting Abstracts of the Physical Society of Japan

巻 70.2, 号 8, p. 2807-082403R, 発行日 2015
出版者
言語 ja
出版者 一般社団法人 日本物理学会
出版者
言語 en
出版者 The Physical Society of Japan
ISSN
収録物識別子タイプ EISSN
収録物識別子 2189-0803
DOI
関連識別子 10.11316/jpsgaiyo.70.2.0_2807
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