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arXiv 2005.11764math.AP
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三维Lipschitz域上的Div-Curl问题和$\mathbf{H}^1$ -正则流函数

Div-Curl Problems and $\mathbf{H}^1$-regular Stream Functions in 3D Lipschitz Domains

Matthias Kirchhart, Erick Schulz

摘要:

本文考虑在有界Lipschitz域$Ω\subset\mathbb{R}^3$上恢复给定涡量${\mathbf F}=\mathrm{curl}\,{\mathbf U}$的无发散速度场${\mathbf U}\in\mathbf{L}^2(Ω)$的问题。为此,我们解决了给定${\mathbf F}\in{\mathbf H}^{-1}(Ω)$的“div-curl问题”。解用矢量势(或流函数)${\mathbf A}\in{\mathbf H}^1(Ω)$表示,使得${\mathbf U}=\mathrm{curl}\,{\mathbf A}$。在讨论了解的存在唯一性和相应的矢势后,我们给出了一个适定性的流函数的构造。给出了一种基于该结构的数值方法,实验证明,所得到的近似结果比另一种常用方法具有更高的正则性。

英文摘要:

We consider the problem of recovering the divergence-free velocity field ${\mathbf U}\in\mathbf{L}^2(Ω)$ of a given vorticity ${\mathbf F}=\mathrm{curl}\,{\mathbf U}$ on a bounded Lipschitz domain $Ω\subset\mathbb{R}^3$. To that end, we solve the "div-curl problem" for a given ${\mathbf F}\in{\mathbf H}^{-1}(Ω)$. The solution is expressed in terms of a vector potential (or stream function) ${\mathbf A}\in{\mathbf H}^1(Ω)$ such that ${\mathbf U}=\mathrm{curl}\,{\mathbf A}$. After discussing existence and uniqueness of solutions and associated vector potentials, we propose a well-posed construction for the stream function. A numerical method based on this construction is presented, and experiments confirm that the resulting approximations display higher regularity than those of another common approach.

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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