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Numerical investigation of toroidal bubble dynamics in a compressible fluid based on boundary integral method

机译：基于边界积分法的可压缩液中环形气泡动力学的数值研究

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摘要

The external liquid compressibility cannot be ignored because the speed of the bubble jet emerging at the end of bubble collapse reaches hundreds of meters per second. Additionally, when the bubble jet penetrates the surface of a bubble, a toroidal bubble forms and the singly connected flow domain changes to a doubly connected topology. As the Biot-Savart law is based on the assumption of incompressibility, the vortex ring model is very difficult to extend to compressible fluids. This paper describes the use of the boundary integral method to establish a numerical model of a toroidal bubble, considering the external liquid compressibility and the internal gas wave effect. A cut is introduced into the fluid domain so that it can be considered as singly connected, with the discontinuity of velocity across this cut equal to the circulation of the flow. Furthermore, the initial bubble condition is calculated by the volume acceleration model. The numerical model is validated through comparisons with experimental data from underwater explosions. The numerical results are found to correlate well with the experimental results. Then, the influence of buoyancy parameters and the internal gas wave effect on toroidal bubble dynamics in a gravitational field is investigated. Published under license by AIP Publishing.
机译：由于气泡坍塌结束时出现的气泡喷射的速度达到数百米，因此不能忽略外部液体压缩性。另外，当气泡射流穿过气泡的表面时，环形气泡形式和单个流动域的变化变为双连接的拓扑。由于Biot-Savart Law基于不可压缩的假设，因此涡旋环模型非常难以延伸到可压缩的流体。本文介绍了边界积分法建立环形泡沫的数值模型，考虑到外部液体压缩性和内部气波效应。将切口引入流体结构域中，使得它可以被认为是单独连接的，在这种切口上的速度不连续等于流动的循环。此外，初始气泡状况由体积加速模型计算。通过与水下爆炸的实验数据的比较验证了数值模型。发现数值结果与实验结果相相关。然后，研究了浮力参数对引力场中环形气泡动力学的影响。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of fluids》 |2019年第10期|共16页
  • 作者

    Xiao W.; Zhang A. -M.; Ye X.; Sun L. Q.;

  • 作者单位

    Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Peoples R China;

    Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Peoples R China;

    Marine Design Res Inst China Shanghai 200011 Peoples R China;

    Harbin Engn Univ Coll Shipbldg Engn Harbin 150001 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 流体力学;
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