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arXiv 1603.06403physics.flu-dyncond-mat.other
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跳跃开尔文波

Leapfrogging Kelvin waves

N. Hietala, R. Hänninen, H. Salman, C. F. Barenghi

摘要:

两个涡环可以形成局部配置,由此它们以交替的方式连续地穿过彼此。这种现象被称为蛙跳。使用适合于超流氦-4的参数,我们描述了一种类似于蛙跳的复发现象,它发生在两个同轴的直涡丝具有相同的开尔文波模式。对于小振幅开尔文波,我们证明了我们的完整的Biot-Savart模拟密切遵循从简化模型,提供了一个近似的分析开发的几乎平行的旋涡预测。我们的研究结果也与经典流体中的薄芯螺旋涡有关。

英文摘要:

Two vortex rings can form a localized configuration whereby they continually pass through one another in an alternating fashion. This phenomenon is called leapfrogging. Using parameters suitable for superfluid helium-4, we describe a recurrence phenomenon that is similar to leapfrogging, which occurs for two coaxial straight vortex filaments with the same Kelvin wave mode. For small-amplitude Kelvin waves we demonstrate that our full Biot-Savart simulations closely follow predictions obtained from a simpified model that provides an analytical approximation developed for nearly parallel vortices. Our results are also relevant to thin-cored helical vortices in classical fluids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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