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可压缩双流体系统中弱-强唯一性的研究

Weak-strong uniqueness for bi-fluid compressible system with algebraic closure

Anhui University(安徽大学);Johannes Gutenberg-University Mainz(美因茨约翰内斯古腾堡大学);Charles University(查理大学);University of Warwick(华威大学)

Yang Li, Mária Lukáčová-Medvid'ová, Milan Pokorný, Ewelina Zatorska

AI总结:

本文研究了可压缩双流体系统中弱-强唯一性问题,利用相对熵方法建立了该原理,并揭示了相体积分数传输方程的非线性项对估计的影响。

摘要:

我们考虑了一个具有共同速度场和代数压力律的可压缩粘性双流体系统。构成关系通过隐函数涉及两种流体的密度。已知自Novotný和Pokorný [Arch. Rational Mech. Anal., 2020]的工作以来,该系统存在全局时间有限能量弱解。另一方面,局部时间强解的存在性归功于Piasecki和Zatorska [J. Math Fluid Mech., 2022]。在本文中,我们利用相对熵方法建立了弱-强唯一性原理。与Baer-Nunziato型两相模型不同,相$+$的体积分数遵循一个带有额外非线性项的传输方程。这导致了相对熵不等式中的麻烦项。我们通过巧妙利用系统的结构来闭合估计。

英文摘要:

We consider a real two-fluid system of compressible viscous fluids with a common velocity field and algebraic closure for the pressure law. The constitutive relation involves densities of both fluids through an implicit function. The existence of global-in-time finite energy weak solutions to this system is known since the work of Novotný and Pokorný [Arch. Rational Mech. Anal., 2020]. On the other hand, existence of local-in-time strong solutions is due to Piasecki and Zatorska [J. Math Fluid Mech., 2022]. In this paper, we establish the weak-strong uniqueness principle using the relative entropy method. In sharp contrast to the two-phase model of Baer-Nunziato type, the volume fraction of phase $+$ obeys a transport equation with an additional nonlinear term. This gives rise to troublesome terms in the relative entropy inequality. We are able to close the estimate by making an elaborate use of the structure of the 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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