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arXiv 1901.04578physics.plasm-phphysics.flu-dyn
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关于Rayleigh-Taylor界面混合

On Rayleigh-Taylor interfacial mixing

Evgeny E. Meshkov, Snezhana I. Abarzhi

摘要:

瑞利-泰勒不稳定性的发展时,流体的密度梯度加速,强烈的界面流体混合enclusive随着时间的推移。Rayleigh-Taylor混合控制着流体、等离子体、材料、天体物理和原子尺度上的广泛过程。在这篇论文中,我们简要回顾了理论和实验方法,并应用理论和实验来研究瑞利-泰勒流中的有序和无序。该理论发现,非均匀各向异性加速瑞利-泰勒混合的性质不同于均匀各向同性惯性湍流的性质,包括强相关性、弱波动性和对确定性条件的敏感性。实验明确地观察到瑞利-泰勒混合在非常高的雷诺数的非均匀性和各向异性,以及加速和加速剪切对界面动力学的稳定作用。理论与实验相吻合,表明Rayleigh- Taylor混合与其他加速流一样,也可以表现出有序性和层化,从而为自然界和技术领域复杂过程的研究开辟了新的视角。

英文摘要:

The Rayleigh-Taylor instability develops when fluids are accelerated counter to their density gradients; intense interfacial fluid mixing ensues with time. The Rayleigh-Taylor mixing controls a broad range of processes in fluids, plasmas, materials, at astrophysical and at atomic scales. In this perspective paper we briefly review theoretical and experimental approaches, and apply theory and experiment to investigate order and disorder in Rayleigh-Taylor flows. The theory finds that properties of heterogeneous anisotropic accelerated Rayleigh-Taylor mixing depart from those of homogeneous isotropic inertial turbulence, including strong correlations, weak fluctuations, and sensitivity to deterministic conditions. The experiment unambiguously observes the heterogeneity and anisotropy of Rayleigh-Taylor mixing at very high Reynolds numbers, and the stabilizing effects of acceleration and accelerated shear on the interfacial dynamics. The theory and the experiment agree with one another and evince that Rayleigh- Taylor mixing may exhibit order and laminarize, similarly to other accelerated flows, thus opening new perspectives for research of complex processes in nature and technology.

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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