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arXiv 1209.0157math.APmath-phmath.MP
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二维可压缩斯托克斯方程在$\mathbb{R}^2$中的整体经典解

Global classical solutions to the two-dimensional compressible Navier-Stokes equations in $\mathbb{R}^2$

Quansen Jiu, Yi Wang, Zhouping Xin

摘要:

本文证明了任意大初值下二维可压缩Navier-斯托克斯方程Cauchy问题的经典解的整体适定性,其中剪切粘度$μ$为正常数,体粘度$ł(\r)=\r^\b$为$\b>\frac43$ .这里的初始密度在远场保持非真空态$\barρ>0$,我们的结果推广了Vaigant-Kazhikhov [41]对周期问题的结果和Jiu-Wang-Xin [26]和Huang-Li [8]对远场具有真空态$\barρ=0$的Cauchy问题的结果.结果表明,只要初始密度均匀地远离真空,该解在任何有限时间内都不会发展出真空态。当初始数据包含$\mathbb{R}^2$子集中的真空态且满足自然相容条件时,结果也成立。得到了一些新的加权估计,建立了密度的上界。

英文摘要:

In this paper, we prove the global well-posedness of the classical solution to the 2D Cauchy problem of the compressible Navier-Stokes equations with arbitrarily large initial data when the shear viscosity $μ$ is a positive constant and the bulk viscosity $ł(\r)=\r^\b$ with $\b>\frac43$. Here the initial density keeps a non-vacuum states $\barρ>0$ at far fields and our results generalize the ones by Vaigant-Kazhikhov [41] for the periodic problem and by Jiu-Wang-Xin [26] and Huang-Li [8] for the Cauchy problem with vacuum states $\barρ=0$ at far fields. It shows that the solution will not develop the vacuum states in any finite time provided the initial density is uniformly away from vacuum. And the results also hold true when the initial data contains vacuum states in a subset of $\mathbb{R}^2$ and the natural compatibility conditions are satisfied. Some new weighted estimates are obtained to establish the upper bound of the density.

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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