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Comparison of flow fields induced by fixed and oscillatory vertical cylinders in regular waves using 3D numerical model

机译：使用3D数值模型比较固定波和振荡垂直圆柱在规则波中引起的流场

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摘要

The influences of a flexibly mounted cylinder and a fixed cylinder on the flow field in regular waves are studied numerically. Performances of the flexibly mounted cylinder oscillating freely in still water and in regular waves are first simulated. Then the in-line forces on the two cylinders in regular waves are compared to the theoretical results. All results indicate the present model is valid. Then the entire flow fields induced by the two cylinders are analyzed in detail. The windward and leeward regions of the cylinder are each divided into eight sections. Results of the windward side are complex because of the superposition of incoming and reflected waves. Results of the leeward side show that the sectional average wave height decreases as the wave frequency increases. In general, the flexibly mounted cylinder attenuates wave energy more effectively. Moreover, the wave frequency is a major factor influencing the flow field. When the incident wave frequency approaches the natural frequency of the cylinder, differences of the two data sets become significant. Distance between the section and the cylinder is another influential factor. The two sets of results become more similar as the distance increases, especially in cases of low incident wave frequencies. (C) 2015 Elsevier Ltd. All rights reserved.
机译：数值研究了柔性缸和固定缸对规则波流场的影响。首先模拟了灵活安装的圆柱体在静水中和规则波中自由振动的性能。然后将规则波在两个圆柱上的轴向力与理论结果进行比较。所有结果表明该模型是有效的。然后详细分析了两个气缸引起的整个流场。圆柱体的上风和下风区域分别分为八个部分。由于入射波和反射波的叠加，迎风面的结果很复杂。下风侧的结果表明，截面平均波高随着波频率的增加而减小。通常，柔性安装的圆柱体可以更有效地衰减波能。此外，波频率是影响流场的主要因素。当入射波频率接近圆柱体的固有频率时，这两个数据集的差异变得很明显。截面与圆柱体之间的距离是另一个影响因素。随着距离的增加，两组结果变得越来越相似，尤其是在低入射波频率的情况下。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Ocean Engineering》 |2015年第15期|238-251|共14页
  • 作者

    Han Yi; Zhan Jie-Min; Su Wei; Li Yok-Sheung; Zhou Quan;

  • 作者单位

    Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China;

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

    Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China;

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

    Cylinder; Wave-structure interaction; Flow field; Dynamic mesh;

    机译：圆柱;波-结构相互作用;流场;动态网格;

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