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Simulation of the initial three-dimensional instability of a vortex ring .

机译:涡环初始三维不稳定性的模拟。

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摘要

Computational simulations of a perturbed vortex ring are performed to recreate and understand the instability seen in impacting water droplet experiments. Three initial conditions are tried to respectively trigger a Widnall instability, a Rayleigh centrifugal instability, and a vortex breakdown instability. Simulations with a perturbed solitary ring result in an instability similar to that seen experimentally. Waviness of the core which would be expected from a Widnall instability is not visible. Adding an opposite-signed secondary vortex ring or an image vortex ring to the initial conditions does not appear to significantly change the instability from what is seen with a solitary ring. This suggests that a Rayleigh centrifugal instability or a vortex breakdown instability are not likely at work, though tests are not conclusive. Elliptical streamlines are visible in the core of the solitary ring at early times, suggesting that an elliptic instability may be the source of the experimental instability.
机译:进行了涡流环的计算仿真,以重建并理解在影响水滴实验中看到的不稳定性。尝试了三种初始条件来分别触发Widnall不稳定性,Rayleigh离心不稳定性和涡旋破坏不稳定性。用孤立环进行扰动的模拟导致的不稳定与实验中看到的类似。 Widnall不稳定性所期望的核心波纹度是不可见的。在初始条件上增加一个相反符号的次级涡流环或一个图像涡流环,似乎并不会显着改变孤立环的不稳定性。这表明尽管试验不是结论性的,但瑞利离心失稳或涡旋破坏失稳不太可能起作用。椭圆形流线在早期可以在孤立环的核心中看到,这表明椭圆形不稳定性可能是实验不稳定性的来源。

著录项

  • 作者

    Wiwchar, Justin.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.Sc.
  • 年度 2010
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 关键词

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