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arXiv 1710.10751math.APmath.FA
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再论完备欧拉系统的测度值解

Measure-valued solutions to the complete Euler system revisited

Jan Brezina, Eduard Feireisl

摘要:

我们考虑描述一般无粘可压缩流体时间演化的完整欧拉方程组。本文在总能量平衡和熵不等式的基础上,对没有重整化的物理熵引入了测度值解的概念。这类所谓的耗散测度值解足够大,可以包括Navier-Stokes-Fourier系统的耗散极限。我们的主要结果表明,在某些物理基础的本构关系下,粘性系数和导热系数为零的Navier-Stokes-Fourier方程组的任何弱解序列都生成Euler方程组的耗散测度值解.最后,我们讨论了H. Brenner提出的双速流体模型的相同渐近极限。

英文摘要:

We consider the complete Euler system describing the time evolution of a general inviscid compressible fluid. We introduce a new concept of measure-valued solution based on the total energy balance and entropy inequality for the physical entropy without any renormalization. This class of so-called dissipative measure-valued solutions is large enough to include the vanishing dissipation limits of the Navier-Stokes-Fourier system. Our main result states that any sequence of weak solutions to the Navier-Stokes-Fourier system with vanishing viscosity and heat conductivity coefficients generates a dissipative measure-valued solution of the Euler system under some physically grounded constitutive relations. Finally, we discuss the same asymptotic limit for the bi-velocity fluid model introduced by H.Brenner.

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