Diffusive Limit of Transport Equation in 3D Convex Domains
Diffusive Limit of Transport Equation in 3D Convex Domains
复制标题
3D凸域中输运方程的扩散极限
DOI:
10.1007/s42543-020-00032-4
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Wu, Lei
中科院分区:
文献类型:
--
作者:
Wu, Lei
Consider neutron transport equations in 3D convex domains with in-flow boundary. We mainly study the asymptotic limits as the Knudsen number. Using Hilbert expansion, we rigorously justify that the solution of steady problem converges to that of Laplace’s equation, and the solution of unsteady problem converges to that of heat equation. This is the most difficult case of a long-term project on asymptotic analysis of kinetic equations in bounded domains. The proof relies on a detailed analysis on the boundary layer effect with geometric correction. The upshot of this paper is a novel boundary layer decomposition argument in 3D andbootstrapping method for time-dependent problem.
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