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arXiv 2105.00596math.AP
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具有表面张力的自由边界不可压缩磁流体动力学的局部适定性

Local Well-posedness of the Free-Boundary Incompressible Magnetohydrodynamics with Surface Tension

Xumin Gu, Chenyun Luo, Junyan Zhang

AI总结:

本文研究带表面张力的三维自由边界不可压缩理想 MHD 方程组,通过人工粘性近似和极限论证证明其局部适定性,并克服速度—磁场强耦合及对称结构丧失带来的困难。

摘要:

我们证明了具有表面张力的三维自由边界不可压缩理想磁流体动力学(MHD)方程组的局部适定性,该方程组描述了电磁场中理想导电流体的运动。我们借鉴 Coutand 和 Shkoller 在杰出论文 [11] 中提出的思想,构造了一个由 κ>0 索引、带人工粘性的近似问题;当 κ→0 时,其解收敛到 MHD 方程组的解。然而,由于速度场与磁场之间的强耦合,MHD 方程组的局部适定性并非 Euler 方程组结果的简单推论。本文是第二和第三作者此前工作 [38] 的延续;在该工作中,他们建立了具有表面张力的不可压缩自由边界 MHD 的先验能量估计。但存在性并不是该先验估计的平凡推论,因为对称结构的丧失使其无法直接适用于近似问题。

英文摘要:

We prove the local well-posedness of the 3D free-boundary incompressible ideal magnetohydrodynamics (MHD) equations with surface tension, which describe the motion of a perfect conducting fluid in an electromagnetic field. We adapt the ideas developed in the remarkable paper [11] by Coutand and Shkoller to generate an approximate problem with artificial viscosity indexed by $κ>0$ whose solution converges to that of the MHD equations as $κ\to 0$. However, the local well-posedness of the MHD equations is no easy consequence of Euler equations thanks to the strong coupling between the velocity and magnetic fields. This paper is the continuation of the second and third authors' previous work [38] in which the a priori energy estimate for incompressible free-boundary MHD with surface tension is established. But the existence is not a trivial consequence of the a priori estimate as it cannot be adapted directly to the approximate problem due to the loss of the symmetric structure.

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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