NUMERICAL STUDY ON SECONDARY FLOW AND AIR-WATER GAS TRANSFER IN OPEN-CHANNEL FLOW WITH FREE-SURFACE FLUCTUATION

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  • 水面変動を考慮した開水路乱流の二次流構造と気液界面のガス交換機構に関する数値解析
  • 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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Abstract

 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.

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