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arXiv 2307.05985math.APcs.NAmath.NA
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交叉扩散-Cahn-Hilliard系统的稳态解与长时间渐近行为

Stationary solutions and large time asymptotics to a cross-diffusion-Cahn-Hilliard system

Jean Cauvin-Vila, Virginie Ehrlacher, Greta Marino, Jan-Frederik Pietschmann

AI总结:

本文研究多物种交叉扩散Cahn-Hilliard系统,通过比较论证得到极小化元严格界并建立与单物种能量的联系,证明其可作为稳态解,同时分析能量凸性与长时间渐近行为,并提出保结构有限体积格式进行数值验证。

摘要:

我们研究了一类多物种退化Ginzburg-Landau能量的若干性质及其与交叉扩散Cahn-Hilliard系统的关系。该模型的动机来源于多组分混合物,其中考虑了不同物种之间的交叉扩散效应,并且只有一种物种会与其他物种发生相分离。利用比较论证,我们得到了极小化元的严格界,由此可以推导出一阶最优性条件,揭示了其与单物种能量之间的联系,并提供了足够的正则性,使得极小化元能够被认定为演化系统的稳态解。我们还讨论了能量的凸性性质以及时间依赖问题的长时间渐近行为。最后,我们针对时间依赖问题引入了一种保结构有限体积格式,并在一维和二维空间中给出了若干数值实验。

英文摘要:

We study some properties of a multi-species degenerate Ginzburg-Landau energy and its relation to a cross-diffusion Cahn-Hilliard system. The model is motivated by multicomponent mixtures where crossdiffusion effects between the different species are taken into account, and where only one species does separate from the others. Using a comparison argument, we obtain strict bounds on the minimizers from which we can derive first-order optimality conditions, revealing a link with the single-species energy, and providing enough regularity to qualify the minimizers as stationary solutions of the evolution system. We also discuss convexity properties of the energy as well as long time asymptotics of the time-dependent problem. Lastly, we introduce a structure-preserving finite volume scheme for the time-dependent problem and present several numerical experiments in one and two spatial dimensions.

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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