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首页> 外文期刊>Journal of Fluids >Numerical and Experimental Analysis of the Growth of Gravitational Interfacial Instability Generated by Two Viscous Fluids of Different Densities
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Numerical and Experimental Analysis of the Growth of Gravitational Interfacial Instability Generated by Two Viscous Fluids of Different Densities

机译：两种不同密度的粘性流体产生引力界面不稳定性的数值和实验分析

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摘要

In the geophysical context, there are a wide variety of mechanisms which may lead to the formation of unstable density stratification, leading in turn to the development of the Rayleigh-Taylor instability and, more generally, interfacial gravity-driven instabilities, which involves moving boundaries and interfaces. The purpose of this work is to study the level set method and to apply the process to study the Rayleigh-Taylor instability experimentally and numerically. With the help of a simple, inexpensive experimental arrangement, the R-T instability has been visualized with moderate accuracy for real fluids. The same physical phenomenon has been investigated numerically to track the interface of two fluids of different densities to observe the gravitational instability with the application of level set method coupled with volume of fraction replacing the Heaviside function. Good agreement between theory and experimental results was found and growth of instability for both of the methods has been plotted.
机译：在地球物理背景下，有多种机制可能导致不稳定的密度分层的形成，进而导致瑞利-泰勒不稳定性的发展，更普遍的是界面重力驱动的不稳定性的发展，其中涉及移动边界和界面。这项工作的目的是研究水平设置方法，并将该过程应用于实验和数值研究瑞利-泰勒不稳定性。借助简单，廉价的实验装置，已对R-T不稳定性进行了可视化，对实际流体的准确性适中。已经通过数值研究了相同的物理现象，以跟踪不同密度的两种流体的界面，并通过使用水平集方法结合分数体积代替Heaviside函数来观察重力失稳。在理论和实验结果之间找到了很好的一致性，并绘制了两种方法的不稳定性增长图。

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