書誌事項
- タイトル別名
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- NUMERICAL STUDY ON SECONDARY FLOW AND AIR-WATER GAS TRANSFER IN OPEN-CHANNEL FLOW WITH FREE-SURFACE FLUCTUATION
- スイメン ヘンドウ オ コウリョ シタ カイスイロ ランリュウ ノ ニジリュウ コウゾウ ト キエキ カイメン ノ ガス コウカン キコウ ニ カンスル スウチ カイセキ
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We carried out a direct numerical simulation of open-channel flow with the free-surface fluctuation to investigate the effect of the fluctuation on the secondary flow and the air-water gas transfer. The DNS reproduces turbulent characteristics of the secondary flow such as the velocity-dip phenomena and counter-rotating vortex pairs, and they are almost similar to numerical results without the free-surface fluctuation. However, the maximum secondary flow velocity and the depth at which the streamwise velocity becomes maximum are changed by the influence of the free-surface fluctuation. The numerical results show the free-surface fluctuation enforces the secondary flow. The turbulent field near the sidewall that controls the air-water gas transfer is investigated on the basis of a statistical treatment such as the VITA technique. We can visualize the surface renewal eddies due to the secondary flow through the VITA technique.
収録刊行物
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- 土木学会論文集B1(水工学)
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土木学会論文集B1(水工学) 72 (4), I_517-I_522, 2016
公益社団法人 土木学会
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詳細情報 詳細情報について
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- CRID
- 1390282680329948416
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- NII論文ID
- 130005311992
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- NII書誌ID
- AN10426673
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- ISSN
- 18808751
- 2185467X
- 09167374
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- NDL書誌ID
- 027166632
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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
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- 抄録ライセンスフラグ
- 使用不可