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arXiv 2108.08533math.AP
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具有反射边界的稀疏穿孔区域中定常扩散均匀化的收敛速度

Convergence rate for the homogenization of stationary diffusions in dilutely perforated domains with reflecting boundaries

Wenjia Jing

摘要:

我们重新研究了周期性穿孔区域中泊松方程的均匀化问题,在孔的边界处具有零Neumann数据,在外边界处具有指定的Dirichlet数据。众所周知,如果孔的周期性变为零,但它们的体积分数保持固定和正值,则极限问题是在没有孔的区域中提出的狄利克雷边值问题,并且有效扩散系数被非平凡地修改;如果体积分数变为零,即孔被稀释,则有效算子保持拉普拉斯算子(即,未修改)。我们的主要结果包含了一个“连续性”的研究,在这些有效的模型相对于体积分数的孔和一些新的收敛速度均匀化在稀设置。我们的方法探讨了经典的双尺度展开模型,并依赖于使用层位势论的重标度细胞问题的渐近分析。

英文摘要:

We revisit the homogenization problem for the Poisson equation in periodically perforated domains with zero Neumann data at the boundary of the holes and prescribed Dirichlet data at the outer boundary. It is known that, if the periodicity of the holes goes to zero but their volume fraction remains fixed and positive, the limit problem is a Dirichlet boundary value problem posed in the domain without the holes, and the effective diffusion coefficients are non-trivially modified; if that volume fraction goes to zero instead, i.e. the holes are dilute, the effective operator remains the Laplacian (that is, unmodified). Our main results contain the study of a "continuity" in those effective models with respect to the volume fraction of the holes and some new convergence rates for homogenization in the dilute setting. Our method explores the classical two-scale expansion ansatz and relies on asymptotic analysis of the rescaled cell problems using layer potential theory.

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