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arXiv 1611.04422math.APphysics.flu-dyn
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Stokes/Allen-Cahn系统的锐界面极限

Sharp Interface Limit for a Stokes/Allen-Cahn System

Helmut Abels, YuNing Liu

摘要:

在二维有界区域中,当与扩散界面厚度成正比的参数$\varepsilon>0$趋于零时,考虑耦合Stokes/Allen-Cahn系统的锐界面极限.对于足够小的时间,我们证明了收敛的解决方案的斯托克斯/艾伦-卡恩系统的解决方案的尖锐的界面模型,其中的界面演化是由中曲率方程与一个额外的对流项耦合到一个两相斯托克斯系统的应力张量,它描述了毛细管应力的额外贡献。为此,我们构建了一个合适的近似的解决方案的斯托克斯/艾伦-卡恩系统,使用三个层次的正式匹配的渐近计算的条款,并估计的差异与援助的一个适当的细化的谱估计的线性化艾伦-卡恩运营商。此外,需要仔细处理耦合项。

英文摘要:

We consider the sharp interface limit of a coupled Stokes/Allen-Cahn system, when a parameter $\varepsilon>0$ that is proportional to the thickness of the diffuse interface tends to zero, in a two dimensional bounded domain. For sufficiently small times we prove convergence of the solutions of the Stokes/Allen-Cahn system to solutions of a sharp interface model, where the interface evolution is given by the mean curvature equation with an additional convection term coupled to a two-phase Stokes system with an additional contribution to the stress tensor, which describes the capillary stress. To this end we construct a suitable approximation of the solution of the Stokes/Allen-Cahn system, using three levels of the terms in the formally matched asymptotic calculations, and estimate the difference with the aid of a suitable refinement of a spectral estimate of the linearized Allen-Cahn operator. Moreover, a careful treatment of the coupling terms is needed.

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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