書誌事項
- タイトル別名
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- Turbulent Transport Mechanism in the Vicinity of a Roughness Element for the Boundary Layer over a k-Type Rough Wall
- kケイソメン キョウカイソウ ノ アラサ ヨウソ キンボウ ニ オケル ランリュウ ユソウ キコウ
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Turbulent transport mechanism has been investigated in the vicinity of a roughness element for the boundary layer developing over a k-type rough wall consisting of two-dimensional square ribs. Measurements associated with the conditional averages for 4-quardrant analysis and the higher moments were made on the momentum thickness Reynolds number Rθ=⃥5800. The roughness Reynolds number k+ is 120, which is fully rough regime. A new roughness density parameter λs is defined with considering turbulent transport over grooves between roughness elements, and it can be divided into two-types of the rough wall flows. For the fractional contribution to Reynolds shear stress -(uv)^^- of the 4-quardrant analysis, the sweep event takes larger portion compared with the ejection event in the range of λs>0.6, which includes the present rough wall. On the other hand, the rough wall flows of λs<0.6 have the slightly large portion of the ejection event. The third moments associated with vertical turbulent flux indicate downward transport for λs≥0.7 and upward transport for λs<0.7. From these results and flow visualization of x-z plane near present k-type rough wall, it is explained in term of the existence of the vortex structure that forms necklace vortex type for λs>0.6∼0.7.
収録刊行物
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- 日本機械学会論文集B編
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日本機械学会論文集B編 69 (686), 2260-2267, 2003
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390001206261315200
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- NII論文ID
- 110002388333
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- NII書誌ID
- AN00187441
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- ISSN
- 18848346
- 03875016
- http://id.crossref.org/issn/03875016
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- NDL書誌ID
- 6745687
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可