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Three-dimensional flow structure of a non-buoyant jet in a wave-current coexisting environment

机译：波流共存环境中非浮力射流的三维流动结构

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摘要

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. (C) 2016 Elsevier Ltd. All rights reserved.
机译：研究了波流共存环境中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，以测量在波流共存环境和仅电流环境中射流的瞬时流型和平均速度场，以进行比较。在波流共存的环境中可以清楚地观察到独特的“流出的云”现象，而在仅电流的环境中却很少观察到这种现象。而且，当存在波效应时，平均速度矢量进一步向底部弯曲。为了揭示在波流共存环境中射流的更详细的流动结构，开发了大型涡流仿真（LES）模型，并针对实验数据进行了验证。在深入分析旋涡轮廓和垂直对称平面上的高通滤波流场的基础上，阐明了“流出云”的形成和发展机理。随着瞬时射流流速比的变化，“流出的云”与电流感应的反向旋转涡流对（CVP）动态相互作用，从而导致CVP结构中心上方的平均流场呈梨形分布。这项研究强调，“流出云”的存在可导致波流共存环境中射流扩散和稀释的显着增强。 （C）2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Ocean Engineering》 |2016年第1期|42-54|共13页
  • 作者

    Xu Zhenshan; Chen Yongping; Tao Jianfeng; Pan Yi; Sowa Derrick M. A.; Li Chi-wai;

  • 作者单位

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Coll Harbor Coastal & Offshore Engn, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Coll Harbor Coastal & Offshore Engn, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Coll Harbor Coastal & Offshore Engn, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Harbor Coastal & Offshore Engn, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Harbor Coastal & Offshore Engn, Nanjing 210098, Jiangsu, Peoples R China;

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laboratory experiments; Large eddy simulation; Effluent clouds; Non-buoyant jet; Wave-current coexisting environment;

    机译：实验室实验;大涡模拟;出水云;非浮力射流;波流共存环境;

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