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arXiv 1201.2121math.APmath-phmath.MP
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二维管结构中变粘性定常斯托克斯方程解的渐近展开

Asymptotic expansion of the solution of the steady Stokes equation with variable viscosity in a two-dimensional tube structure

G. Cardone, R. Fares, G. P. Panasenko

摘要:

考虑了变粘性的斯托克斯方程在一个细管结构中的情形,即在一个由高度为$\varepsilon<<1 $、底为1阶、边界光滑的薄矩形组成的连通并中的情形。构造了一个解的渐近展开:它包含一些Poiffille型流动的通道(矩形)与一些边界层修正的通道的分叉附近。证明了精确解的差分估计及其渐近逼近。

英文摘要:

The Stokes equation with the varying viscosity is considered in a thin tube structure, i.e. in a connected union of thin rectangles with heights of order $\varepsilon<<1 $ and with bases of order 1 with smoothened boundary. An asymptotic expansion of the solution is constructed: it contains some Poiseuille type flows in the channels (rectangles) with some boundary layers correctors in the neighborhoods of the bifurcations of the channels. The estimates for the difference of the exact solution and its asymptotic approximation are proved.

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