書誌事項
- タイトル別名
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- Coherent structure of a d-type rough wall boundary layer by means of the vita analysis : low reynolds number effect
- VITAホウ ニヨル dガタ ソメン キョウカイソウ ノ ソシキ コウゾウ ノ カイセキ : テイレイノルズスウ ノ コウカ
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抄録
In order to examine the Reynolds number effect on the turbulent structure of a d-type rough wall boundary later, the bursting phenomenon which had major contribution to the turbulent production was investigated by means of the VITA analysis. The mean bursting frequency and conditional averaged velocity patterns of u, v and uv components were obtained in the low Reynolds number range of R_θ=800-5000. The scaling of the mean bursting frequency with the conventional scales in boundary layers, inner, outer and mixed time scales fails in the low Reynolds number range of the present d-type rough wall flow. The peak value and time duration of the conditional averaged signals both in the ejection and sweep processes depend on the Reynolds number in the transitional rough regime of R_θ<2000. It is expected that the behavior of the non-linear interaction between the boundary layer and low momentum fluid particle in the transverse grooves, which leads enhancement of the momentum exchange and large turbulent production rate is essential to describe the Reynolds number effect over the d-type roughness.
収録刊行物
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- 山口大学工学部研究報告
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山口大学工学部研究報告 44 (2), 333-341, 1994-03
山口大学工学部
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詳細情報 詳細情報について
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- CRID
- 1050564287404235136
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- NII論文ID
- 110000216950
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- NII書誌ID
- AN00244228
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- ISSN
- 03727661
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- NDL書誌ID
- 3859558
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- 本文言語コード
- ja
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- 資料種別
- departmental bulletin paper
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- データソース種別
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- IRDB
- NDL
- CiNii Articles