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arXiv 2209.05046physics.flu-dyncond-mat.stat-mechnlin.CD
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关于三维不可压缩Galerkin截断欧拉方程的热化

On the thermalization of the three-dimensional, incompressible, Galerkin-truncated Euler equation

Sugan Durai Murugan, Samriddhi Sankar Ray

AI总结:

本文通过数值模拟揭示三维Galerkin截断欧拉方程热化的触发机制,将其约化为一维问题,并探讨利用热化机制获取耗散解及判断有限时间爆发的可能性。

摘要:

Galerkin截断的三维不可压缩欧拉方程的长时间解,由于该有限维系统中相空间和动能守恒,会弛豫到绝对平衡态。这些热化解的特征是速度场的吉布斯分布以及动能在其(有限)傅里叶模式间的均分。我们现在通过详细的数值模拟,展示了物理空间中不可避免的热化的触发因素,以及该问题如何可约化为一个有效的一维问题,从而使得与更常研究的Burgers方程的比较成为可能。我们还讨论了如何利用我们对热化机制的理解,在数值上获得欧拉方程的耗散解,以及在计算机模拟中支持或反对有限时间爆发的证据。

英文摘要:

The long-time solutions of the Galerkin-truncated three-dimensional, incompressible Euler equation relax to an absolute equilibrium as a consequence of phase space and kinetic energy conservation in such a finite-dimensional system. These thermalized solutions are characterised by a Gibbs distribution of the velocity field and kinetic energy equipartition amongst its (finite) Fourier modes. We now show, through detailed numerical simulations, the triggers for the inevitable thermalization in physical space and how the problem is reducible to an effective one-dimensional problem making comparisons with the more studied Burgers equation feasible. We also discuss how our understanding of the mechanism of thermalization can be exploited to numerically obtain dissipative solutions of the Euler equations and evidence for or against finite-time blow-up in computer simulations.

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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