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arXiv 2103.09956math.AP
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粘性系数依赖于温度的可压缩Navier-斯托克斯方程整体弱解的存在性

Global existence of weak solutions to the compressible Navier-Stokes equations with temperature-depending viscosity coefficients

Guodong Wang, Bijun Zuo

摘要:

研究了有界区域上具有热传导效应的三维可压缩Navier-斯托克斯方程整体弱解的存在性。假设粘度和导热系数是温度的函数,并且剪切粘度系数可以随着温度变为零而消失。证明方法是将Galerkin方法应用于一个合适的多参数近似系统,得到其近似解的一致估计。获得所需估计的关键成分是将De Giorgi的迭代应用于修改的温度方程,由此我们可以得到温度的下界,而不依赖于在修改的动量方程中引入的人工粘性系数,这使得当人工粘性项消失时,紧致性参数可用。

英文摘要:

This paper is devoted to the global existence of weak solutions to the three-dimensional compressible Navier-Stokes equations with heat-conducting effects in a bounded domain. The viscosity and the heat conductivity coefficients are assumed to be functions of the temperature, and the shear viscosity coefficient may vanish as the temperature goes to zero. The proof is to apply Galerkin method to a suitable approximate system with several parameters and obtain uniform estimates for the approximate solutions. The key ingredient in obtaining the required estimates is to apply De Giorgi's iteration to the modified temperature equation, from which we can get a lower bound for the temperature not depending on the artificial viscosity coefficient introduced in the modified momentum equation, which makes the compactness argument available as the artificial viscous term vanishes.

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