Turbulence Structure of Multiscale Generated Turbulence by Fractal Grids and Scalar Transfer Mechanism : 2nd Report, DNS on the Influence of Grid Parameters on Homogeneity, Isotropy and Intermittency(Fluids Engineering)
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- SUZUKI Hiroki
- Department of Mechanical Science and Engineering, Nagoya University
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- NAGATA Kouji
- Department of Mechanical Science and Engineering, Nagoya University
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- SAKAI Yasuhiko
- Department of Mechanical Science and Engineering, Nagoya University
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- HAYASE Toshiyuki
- 東北大学流体科学研究所
Bibliographic Information
- Other Title
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- フラクタル格子により生成されるマルチスケール誘起乱流の構造とスカラー拡散機構 : 第2報,DNSによる一様等方性と間欠性に及ぼす格子パラメータの影響の検討(流体工学,流体機械)
- フラクタル格子により生成されるマルチスケール誘起乱流の構造とスカラー拡散機構(第2報)DNSによる一様等方性と間欠性に及ぼす格子パラメータの影響の検討
- フラクタル コウシ ニ ヨリ セイセイ サレル マルチスケール ユウキ ランリュウ ノ コウゾウ ト スカラー カクサン キコウ ダイ2ホウ DNS ニ ヨル イチヨウ トウ ホウセイ ト カンケツセイ ニ オヨボス コウシ パラメータ ノ エイキョウ ノ ケントウ
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Abstract
Turbulence characteristics in the spatially developing fractal-generated turbulence are investigated by means of the direct numerical simulation (DNS). The square type fractal grids are numerically constructed using the immersed boundary method. The effects of solidity σ and thickness ratio t_r, which are ones of the most important grid parameters for fractal grids, are investigated in detail. The results show that the increase of σ leads to the improvement of the uniformity and isotropy of flow fields. The integral length scale in the decaying region of the fractal-generated turbulence remains monotone increase at high σ and t_r, whereas it is approximately constant at low σ and t_r. The derivative skewness and flatness in the streamwise direction are different from those in the transverse direction for all σ and t_r investigated. These results will be useful for designing fractal grids for practical applications.
Journal
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- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
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TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 76 (772), 2024-2031, 2010
The Japan Society of Mechanical Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390001206294325632
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- NII Article ID
- 110008006785
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- NII Book ID
- AN00187441
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- ISSN
- 18848346
- 03875016
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- NDL BIB ID
- 10955016
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed