Study on mass transfer process and turbulence structure in open-channel flows with wind-induced water waves

风生水波明渠流传质过程及湍流结构研究

• 批准号: 21760385
• 负责人: SANJOU Michio
• 金额: $ 2.75万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21760385/
• 关键词: 風波現象; マルチカメラ・ステレオPIV; 乱流計測; 組織乱流構造; 3次元構造; 風波; PIV計測; 乱流; ラングミュアー循環流; 高精度流体計測; ステレオPIV; マルチカメラシステム; 物質輸送; 開水路流れ; PIV; 組織構造; 可視化計測; 波・乱れの分離; 乱れエネルギー収支特性

When wind appears over the free-surface flows such as actual rivers and artificial channels, a significant velocity shear and water waves are generated near the air/water interface. It is inferred that coherent turbulence structure such as hairpin vortex in the near-wall region is also influenced by these interfacial fluctuations. However, a lot of uncertainties remain about the wind effects on wall-turbulence structure. In the first stage of the present study, PIV measurements were conducted in open-channel flows under the wind flows in order to reveal the effects of interfacial free-surface condition on coherent turbulence structure and energy transfer process in the inner and outer layers. Wind-induced water waves observed in natural lakes and ocean cause secondary currents called as Langmuir circulation. In the second stage, all three velocity components could be measured simultaneously by the stereoscopic PIV technique. The present multi-camera system allowed us to investigate the phase relation between the surface fluctuation and the velocity components, effects of aspect ratio on formation properties of Langmuir circulation and so on.

当风出现在实际河流和人工河道等自由表面流动上时，在气水界面附近产生了显著的速度切变和水波。由此推断，近壁区的发卡涡等拟序湍流结构也受到这些界面涨落的影响。然而，风对壁面湍流结构的影响仍存在许多不确定性。在本研究的第一阶段，在明渠水流中进行了PIV测量，以揭示界面自由表面条件对内、外层相干湍流结构和能量传递过程的影响。在天然湖泊和海洋中观察到的风致水波会产生二次流，称为朗缪尔环流。在第二阶段，利用立体PIV技术可以同时测量所有三个速度分量。目前的多相机系统使我们能够研究表面起伏与速度分量之间的相位关系，长宽比对朗缪尔环流形成特性的影响等。

项目成果

Energy transfer properties among mean, wave and turbulence components in open-channel flows with wind-induced water waves

风生水波明渠流中平均分量、波浪分量和湍流分量之间的能量传递特性

• 发表时间: 2010

風波・開水路混成流における組織乱流渦とエネルギー輸送動態の解明

阐明风波/明渠混合流中的组织湍流涡流和能量传输动力学

• 发表时间: 2009
• 期刊: 土木学会論文集B 65
• 作者: 山上路生;禰津家久
• 通讯作者: 禰津家久

PIV studies on turbulence structure in ari/water interface with ind-induced water waves

感应水波下 ari/水界面湍流结构的 PIV 研究

• 发表时间: 2010
• 期刊: Journal of Hydrodynamics
• 影响因子: 2.5
• 作者: Sanjou;M.;Nezu;I.;Toda;A.
• 通讯作者: A.

Mass transport properties in closed basin with wind-induced water waves

风致水波封闭盆地中的质量输运特性

• 发表时间: 2010

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