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arXiv 2003.06578math.AP
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相邻圆柱间Stokes流应力集中的定量估算

Quantitative estimates for stress concentration of the Stokes flow between adjacent circular cylinders

Habib Ammari, Hyeonbae Kang, Do Wan Kim, Sanghyeon Yu

摘要:

当两个具有高对比度材料特性的夹杂物在均匀介质中彼此靠近时,在它们之间的狭窄区域中应力可以变得任意大。本文研究了二维Stokes流中当夹杂为等半径圆柱的二维横截面且背景速度场为线性时的应力集中问题。我们构造了两个向量值函数,它完全捕获了应力的奇异行为,并导出了应力在两个圆柱之间的距离趋于零时在这些函数方面的渐近表示公式。然后,我们表明,使用的表示公式,应力总是通过证明,无论是压力或剪应力分量的应力张量爆破。爆破速率被示出为$δ^{-1/2}$,其中$δ$是两个圆柱体之间的距离。据我们所知,这项工作是第一个严格推导出的渐近解在狭窄的区域的斯托克斯流。

英文摘要:

When two inclusions with high contrast material properties are located close to each other in a homogeneous medium, stress may become arbitrarily large in the narrow region between them. In this paper, we investigate such stress concentration in the two-dimensional Stokes flow when inclusions are the two-dimensional cross sections of circular cylinders of the same radii and the background velocity field is linear. We construct two vector-valued functions which completely capture the singular behavior of the stress and derive an asymptotic representation formula for the stress in terms of these functions as the distance between the two cylinders tends to zero. We then show, using the representation formula, that the stress always blows up by proving that either the pressure or the shear stress component of the stress tensor blows up. The blow-up rate is shown to be $δ^{-1/2}$, where $δ$ is the distance between the two cylinders. To our best knowledge, this work is the first to rigorously derive the asymptotic solution in the narrow region for the Stokes flow.

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