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arXiv 2104.04253math.AP
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Sobolev框架下定常MHD的Prandtl展开式的有效性

Validity of Prandtl expansions for steady MHD in the Sobolev framework

Cheng-Jie Liu, Tong Yang, Zhu Zhang

摘要:

本文研究了半平面上二维定常不可压MHD系统在速度场为无滑移边界条件、磁场为理想导电壁条件下的粘性消失极限和磁阻极限。本文证明了具有非简并切向磁场的Prandtl型剪切流的非线性稳定性,但对速度场不作任何正性或单调性假设。它与定常Navier-斯托克斯方程形成鲜明对比,反映了磁场的稳定作用。与非定常MHD系统不同,我们通过引入一个内禀权函数和一些好的辅助函数,来处理无滑移边界条件引起的边界退化,并得到解的估计。

英文摘要:

This paper is concerned with the vanishing viscosity and magnetic resistivity limit for the two-dimensional steady incompressible MHD system on the half plane with no-slip boundary condition on velocity field and perfectly conducting wall condition on magnetic field. We prove the nonlinear stability of shear flows of Prandtl type with nondegenerate tangential magnetic field, but without any positivity or monotonicity assumption on the velocity field. It is in sharp contrast to the steady Navier-Stokes equations and reflects the stabilization effect of magnetic field. Unlike the unsteady MHD system, we manage the degeneracy on the boundary caused by no-slip boundary condition and obtain the estimates of solutions by introducing an intrinsic weight function and some good auxiliary functions.

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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