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arXiv 2602.05264math.AP
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压缩磁流体动力学方程在三维外部域中初边值问题的强解

Strong solutions to the initial-boundary-value problem of compressible MHD equations with degenerate viscosities and far field vacuum in 3D exterior domains

Shenzhen University(深圳大学);Nanchang University(南昌大学)

Jiaxu Li, Boqiang Lü, Bing Yuan

AI总结:

本文研究了压缩MHD方程在三维外部域中初边值问题的强解存在性,揭示磁场在处理密度依赖粘性导致的奇点中的作用。

摘要:

本文研究了压缩磁流体动力学(MHD)方程在三维外部域中的初边值问题(IBVP),其中速度采用纳维-斯托克斯滑动边界条件,磁场采用完美导电条件。对于密度最初趋于远场真空且粘性为密度的幂函数(ρ^δ,0 < δ < 1)的情况,建立了正则大初始数据下IBVP强解的局部存在性和唯一性。特别地,与压缩纳维-斯托克斯方程的局部理论(Li-Lü-Yuan [24])不同,我们证明磁场在整个时间演化过程中保持比密度更快的衰减率,揭示了磁场在处理由密度依赖粘性引起的奇点中的作用。

英文摘要:

This paper concerns the initial-boundary-value problem (IBVP) of the compressible Magnetohydrodynamic (MHD) equations in 3D exterior domains with Navier-slip boundary conditions for the velocity and perfect conducting conditions for the magnetic field. For the case that the density approaches far-field vacuum initially and the viscosities are power functions of the density (ρ}δ with 0 < δ < 1), the local existence and uniqueness of strong solutions to the IBVP is established for regular large initial data. In particular, in contrast to the local theory of compressible Navier-Stokes equation Li-Lü-Yuan [24], we show that the magnetic field maintains the initial quality of decaying faster rate than density throughout the time evolution, which reveals the role of the magnetic field in handling singularities arising from density-dependent viscosities.

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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