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arXiv 1908.06124math.AP
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具有动力边界条件的Cahn-Hilliard方程组Robin边界逼近的收敛性

Convergence of a Robin boundary approximation for a Cahn--Hilliard system with dynamic boundary conditions

Patrik Knopf, Kei Fong Lam

摘要:

本文证明了最近C.~提出的Cahn-Hilliard模型的推广的唯一弱解的存在性。Liu和H.~ Wu(2019),其中新的动态边界条件进一步推广为表面和体序参数之间的仿射线性关系。作为第一种方法来处理更一般的和非线性的关系,我们调查的存在性的唯一弱解正则化的罗宾边界条件。在我们的分析中包括的情况下,没有扩散的表面序参数,这将导致新的困难的罗宾系统的分析。此外,对于仿射线性关系的情况下,我们显示了弱收敛的解决方案的正则化参数趋于零,并推导出两个模型之间的误差估计。这是支持的数值实验,也证明了一些非平凡的动力学扩展刘-吴模型,是不存在于原来的模型。

英文摘要:

We prove the existence of unique weak solutions to an extension of a Cahn--Hilliard model proposed recently by C.~Liu and H.~Wu (2019), in which the new dynamic boundary condition is further generalised with an affine linear relation between the surface and bulk order parameters. As a first approach to tackle more general and nonlinear relations, we investigate the existence of unique weak solutions to a regularisation by a Robin boundary condition. Included in our analysis is the case where there is no diffusion for the surface order parameter, which causes new difficulties for the analysis of the Robin system. Furthermore, for the case of affine linear relations, we show the weak convergence of solutions as the regularisation parameter tends to zero, and derive an error estimate between the two models. This is supported by numerical experiments which also demonstrate some non-trivial dynamics for the extended Liu--Wu model that is not present in the original model.

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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