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arXiv 2208.01985math.AP
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三维MHD方程的磁场近似原始方程

The primitive equations with magnetic field approximation of the 3D MHD equations

Lili Du, Dan Li

摘要:

在我们早期的工作\cite{DLL}中,我们证明了薄区域上三维原始方程的强解的整体适定性。本文的心脏是提供一个严格的理由的PEM的推导作为不可压缩的三维尺度磁流体力学(SMHD)方程的各向异性水平粘度和磁场制度的小纵横比限制。对于$H^1$ -初始数据情形,证明了三维SMHD方程的整体Leray-Hopf弱解强收敛于PEM的整体强解.在$H^2$ -初始数据的情况下,对于小的$\v$,SMHD的强解可以扩展为全局解.因此,我们观察到SMHD强解的整体强解收敛到PEM的整体强解。作为副产品,收敛速度与纵横比参数具有相同的量级。

英文摘要:

In our earlier work \cite{DLL}, we have shown the global well-posedness of strong solutions to the three-dimensional primitive equations with the magnetic field (PEM) on a thin domain. The heart of this paper is to provide a rigorous justification of the derivation of the PEM as the small aspect ratio limit of the incompressible three-dimensional scaled magnetohydrodynamics (SMHD) equations in the anisotropic horizontal viscosity and magnetic field regime. For the case of $H^1$-initial data case, we prove that global Leray-Hopf weak solutions of the three-dimensional SMHD equation strongly converge to the global strong solutions of the PEM. In the $H^2$-initial data case, the strong solution of the SMHD can be extended to be a global one for small $\v$. As a consequence, we observe that the global strong solutions of the SMHD strong converge to the global strong solutions of the PEM. As a byproduct, the convergence rate is of the same order as the aspect ratio parameter.

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