arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2002.02766math.AP
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有界区域上迁移方程的渐近分析

Asymptotic Analysis of Transport Equation in Bounded Domains

Lei Wu

摘要:

考虑具有流入边界的三维凸区域中的中子输运方程。我们主要研究Knudsen数$ε\rightarrow 0^+$的渐近极限。利用Hilbert展开,严格证明了定常问题的解收敛于Laplace方程的解,非定常问题的解收敛于热传导方程的解.证明依赖于对边界层效应的详细分析和几何修正。这个问题可以在许多不同的环境中公式化,上面的一个可能是物理上最重要和数学上最具挑战性的。我们必须利用我们在过去十年的一系列论文中开发的几乎所有方法和技术,并带来新的想法来治疗新的并发症。其困难主要来自三个方面:三维区域、边界层规则性和时间依赖性。为了完全解决这个问题,我们引入了几种技术:(1)边界层几何校正;(2)剩余估计$L^2-L^{2m}-L^{\infty}$框架;边界层分解。

英文摘要:

Consider neutron transport equations in 3D convex domains with in-flow boundary. We mainly study the asymptotic limits as the Knudsen number $ε\rightarrow 0^+$. Using Hilbert expansion, we rigorously justify that the solution of steady problem converges to that of the Laplace's equation, and the solution of unsteady problem converges to that of the heat equation. The proof relies on a detailed analysis on the boundary layer effect with geometric correction. This problem can be formulated in many different settings, and the above one is probably the most physically significant and most mathematically challenging. We have to utilize almost all methods and techniques we developed in a series of papers in the past decade, and bring novel ideas to treat the new complications. The difficulty mainly comes from three sources: 3D domain, boundary layer regularity, and time dependence. To fully solve this problem, we introduce several techniques: (1) boundary layer with geometric correction; (2) remainder estimates with $L^2-L^{2m}-L^{\infty}$ framework; boundary layer decomposition.

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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