Three-dimensional flow structure of a non-buoyant jet in a wave-current coexisting environment
Three-dimensional flow structure of a non-buoyant jet in a wave-current coexisting environment
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波流共存环境下非浮力射流三维流动结构
DOI：
10.1016/j.oceaneng.2016.02.022
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发表时间：
2016-04
影响因子：
5
通讯作者：
C.W. Li
中科院分区：
文献类型：
--
作者：
Z. S. Xu;Y. P. Chen;J. F. Tao;Y. Pan;D. M.A. Sowa;C.W. Li
研究了波流共存环境下非浮力垂直圆形射流的三维流动结构。首先进行实验室实验，测量波流共存环境和纯水流环境中射流的瞬时流型和平均速度场，以进行比较。在波流共存环境中可以清楚地观察到独特的“流出云”现象，但在仅有水流的环境中几乎观察不到。此外，当存在波浪效应时，平均速度矢量进一步向底部弯曲。为了揭示波流共存环境中射流更详细的流动结构，开发了大涡模拟（LES）模型并根据实验数据进行了验证。通过对垂直对称面上涡度等值线和高通滤波流场的深入分析，揭示了“流出云”的形成和发展机制。随着瞬时射流与水流速度比的变化，“流出云”与水流引起的反向旋转涡对（CVP）动态相互作用，导致CVP结构中心上方平均流场呈倒梨形分布。这项研究强调，“流出云”的存在可以导致波流共存环境中急流扩散和稀释的显着增强。
The three-dimensional flow structure of a non-buoyant vertical round jet in a wave-current coexisting environment is investigated. Laboratory experiments are first conducted to measure instantaneous flow patterns and mean velocity fields of the jet in a wave-current coexisting environment and a current-only environment for comparison. The distinctive ‘effluent clouds’ phenomenon is clearly observed in the wave-current coexisting environment but scarcely observed in the current-only environment. Moreover, the mean velocity vectors bend further toward the bottom when the wave effect is present. To reveal a more detailed flow structure of the jet in the wave-current coexisting environment, a large eddy simulation (LES) model is developed and validated against the experimental data. The mechanisms of formation and development of ‘effluent clouds’ are unravelled based on in-depth analysis of the vorticity contours and the high-pass filtered flow fields on the vertical symmetrical plane. With the variation of instantaneous jet-to-current velocity ratio, the ‘effluent clouds’ dynamically interact with the current-induced counter-rotating vortex pair (CVP), resulting in an inverted pear-shaped distribution of mean flow field above the CVP structure centre. This study highlights that the existence of ‘effluent clouds’ can lead to a significant enhancement of jet spread and dilution in the wave-current coexisting environment.
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影响因子：
4.6
作者：
T. Lim;T. New;S. Luo
通讯作者：
T. Lim;T. New;S. Luo
影响因子：
4.4
作者：
You Zai-Jin
通讯作者：
You Zai-Jin
影响因子：
5
作者：
Z. You
通讯作者：
Z. You
DOI：
10.1061/(asce)0733-9399(1999)125:7(733
发表时间：
1999-07
期刊：
Journal of Engineering Mechanics-asce
影响因子：
--
作者：
Joseph H. W. Lee;Lin Li;V. Cheung
通讯作者：
Joseph H. W. Lee;Lin Li;V. Cheung
影响因子：
3.7
作者：
Lester L. Yuan;R. Street;J. Ferziger
通讯作者：
Lester L. Yuan;R. Street;J. Ferziger