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arXiv 2101.04847physics.flu-dynphysics.comp-ph
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湍流不混溶Rayleigh-Taylor系统格子Boltzmann算法的验证及应用

Validation and application of the lattice Boltzmann algorithm for a turbulent immiscible Rayleigh-Taylor system

Hugo S. Tavares, Luca Biferale, Mauro Sbragaglia, Alexei A. Mailybaev

摘要:

本文利用Shan-Chen赝势在GPU上实现了二维Rayleigh-Taylor湍流的多组分格子Boltzmann(LB)模型。在不混溶的情况下,这种方法能够准确地克服固有的数值复杂性所造成的复杂结构的界面,出现在充分发展的湍流制度。LB模型的准确性进行测试的早期和后期阶段的不稳定性。对于发达国家的湍流运动,我们分析了不同的条款描述的动能和势能的变化之间的平衡。然后分析了界面在能量平衡中的作用,以及界面诱导的涡量在能量耗散中的作用。统计特性进行了比较混溶和不混溶流。我们的结果也可以被认为是第一个验证步骤,以扩大LB模型的应用程序的三维不混溶瑞利-泰勒湍流。

英文摘要:

We develop a multicomponent lattice Boltzmann (LB) model for the 2D Rayleigh--Taylor turbulence with a Shan-Chen pseudopotential implemented on GPUs. In the immiscible case this method is able to accurately overcome the inherent numerical complexity caused by the complicated structure of the interface that appears in the fully developed turbulent regime. Accuracy of the LB model is tested both for early and late stages of instability. For the developed turbulent motion we analyze the balance between different terms describing variations of the kinetic and potential energies. Then, we analyze the role of interface in the energy balance, and also the effects of the vorticity induced by the interface in the energy dissipation. Statistical properties are compared for miscible and immiscible flows. Our results can also be considered as a first validation step to extend the application of LB model to 3D immiscible Rayleigh-Taylor turbulence.

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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