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arXiv 2109.01775math.AP
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无穷远真空下二维非齐次热传导Navier-Stokes方程和磁流体方程Cauchy问题的整体适定性

Global well-posedness to the 2D Cauchy problem of nonhomogeneous heat conducting Navier-Stokes and magnetohydrodynamic equations with vacuum at infinity

Xin Zhong

摘要:

本文在$\mathbb{R}^2$中重新讨论了非齐次热传导磁流体动力学(MHD)方程的二维Cauchy问题。当初始密度和初始磁场在无穷远处衰减不太慢时,我们得到了该方程整体强解的存在唯一性.特别地,初始数据可以是任意大的。这改进了我们以前的工作,其中初始密度在无穷远处具有非真空态。这一结果也可以看作是L{ü}-Xu-Zhong在非齐次情形下对完全非齐次情形的研究的推广。该方法是基于精细的空间加权估计和所考虑的系统的结构特征。作为副产品,我们得到了在无穷远处具有真空的非齐次热传导Navier-斯托克斯方程的二维Cauchy问题的整体强解的存在性。

英文摘要:

We revisit the 2D Cauchy problem of nonhomogeneous heat conducting magnetohydrodynamic (MHD) equations in $\mathbb{R}^2$. For the initial density allowing vacuum at infinity, we derive the global existence and uniqueness of strong solutions provided that the initial density and the initial magnetic decay not too slowly at infinity. In particular, the initial data can be arbitrarily large. This improves our previous work where the initial density has non-vacuum states at infinity. The result could also be viewed as an extension of the study in L{ü}-Xu-Zhong for the inhomogeneous case to the full inhomogeneous situation. The method is based on delicate spatial weighted estimates and the structural characteristic of the system under consideration. As a byproduct, we get the global existence of strong solutions to the 2D Cauchy problem for nonhomogeneous heat conducting Navier-Stokes equations with vacuum at infinity.

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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