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arXiv 2301.07239math.AP
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具有集中变号涡的稳定平面Euler流

Stable plane Euler flows with concentrated and sign-changing vorticity

Guodong Wang, Bijun Zuo

摘要:

我们构造了一般有界区域中二维不可压缩Euler方程的一族定常解,使得涡量在两个分离的小直径区域中得到支持,并收敛到一对符号相反的点涡。与以往的结果相比,我们不需要假设Kirchhoff-Routh函数存在孤立的局部极小值点.此外,由于其变分性质,所获得的解决方案是Lyapunov稳定的$L^p$范数的涡。证明是通过最大化的动能在一个适当的家庭的重排类的符号变化的功能和研究的极限行为的最大化。

英文摘要:

We construct a family of steady solutions to the two-dimensional incompressible Euler equation in a general bounded domain, such that the vorticity is supported in two well-separated regions of small diameter and converges to a pair of point vortices with opposite signs. Compared with previous results, we do not need to assume the existence of an isolated local minimum point of the Kirchhoff-Routh function. Moreover, due to their variational nature, the solutions obtained are Lyapunov stable in $L^p$ norm of the vorticity. The proofs are achieved by maximizing the kinetic energy over an appropriate family of rearrangement classes of sign-changing functions and studying the limiting behavior of the maximizers.

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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