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arXiv 1706.07261math.AP
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一类退化抛物型交叉扩散离子输运方程组的分析

Analysis of a degenerate parabolic cross-diffusion system for ion transport

Anita Gerstenmayer, Ansgar Jüngel

摘要:

分析了一个描述离子通过生物膜或纳米孔在一个有界域中的混合Dirichlet-Neumann边界条件的交叉扩散系统。离子浓度求解强耦合的扩散方程,其中漂移项涉及通过泊松方程耦合到浓度的电势。在适当的正则性假设下,证明了该方程有界弱解的整体存在性和弱解的唯一性。分析的主要困难是交叉扩散项和扩散矩阵的退化,阻止了标准工具的使用。证明的基础上的边界熵的方法,扩展到非齐次边界条件,和唯一性技术的Gastroski。在一维空间中的有限体积离散说明了数值解的大时间行为,并表明平衡速率可能很小。

英文摘要:

A cross-diffusion system describing ion transport through biological membranes or nanopores in a bounded domain with mixed Dirichlet-Neumann boundary conditions is analyzed. The ion concentrations solve strongly coupled diffusion equations with a drift term involving the electric potential which is coupled to the concentrations through a Poisson equation. The global-in-time existence of bounded weak solutions and the uniqueness of weak solutions under moderate regularity assumptions are shown. The main difficulties of the analysis are the cross-diffusion terms and the degeneracy of the diffusion matrix, preventing the use of standard tools. The proofs are based on the boundedness-by-entropy method, extended to nonhomogeneous boundary conditions, and the uniqueness technique of Gajewski. A finite-volume discretization in one space dimension illustrates the large-time behavior of the numerical solutions and shows that the equilibration rates may be very small.

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