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arXiv 1802.00798math.AP
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某些可压缩多组分流体模型的弱解

Weak solutions for some compressible multicomponent fluid models

Antonin Novotny, Milan Pokorny

摘要:

这项工作的主要目的是调查一个“简单的”,但仍然现实的双流体模型中描述的“粘性”版本[Bresch,Desjardin,Ghidaglia,Grenier,Hillairet],其“非粘性”版本是来自物理考虑\cite [石井,Hibiki]{ISHI}作为一个特定的样本的多流体模型与代数闭包。我们的目标是显示存在的弱解的大初始数据在任意大的时间间隔。我们通过将模型转化为一个类似于可压缩Navier-斯托克斯方程的理论系统来实现这一目标,但是两个连续性方程和一个动量方程被赋予了依赖于两个变密度的复杂结构的压力。新的“学术系统”,然后解决了适应的狮子-Feireisl方法求解可压缩Navier-斯托克斯方程,完成了几个意见有关的DiPerna-狮子运输理论的启发[马耳他,Michalek,Mucha,Novotny,Pokorny,Zatorska]和[Vasseur,温,余]。我们还解释了如何将这些技术推广到一个模型的混合物,然后两个物种。这是第一个关于实际多流体系统存在弱解的结果。

英文摘要:

The principle purpose of this work is to investigate a "viscous" version of a "simple" but still realistic bi-fluid model described in [Bresch, Desjardin, Ghidaglia, Grenier, Hillairet] whose "non-viscous" version is derived from physical considerations in \cite[Ishii, Hibiki]{ISHI} as a particular sample of a multifluid model with algebraic closure. The goal is to show existence of weak solutions for large initial data on an arbitrarily large time interval. We achieve this goal by transforming the model to an academic system which resembles to the compressible Navier-Stokes equations, with however two continuity equations and a momentum equation endowed with pressure of complicated structure dependent on two variable densities. The new "academic system" is then solved by an adaptation of the Lions--Feireisl approach for solving compressible Navier--Stokes equation, completed with several observations related to the DiPerna--Lions transport theory inspired by [Maltese, Michalek, Mucha, Novotny, Pokorny, Zatorska] and [Vasseur, Wen, Yu]. We also explain how these techniques can be generalized to a model of mixtures with more then two species. This is the first result on the existence of weak solutions for any realistic multifluid system.

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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