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arXiv 1703.03124math.AP
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二维Stokes浸入边值问题的可解性

Solvability of the Stokes Immersed Boundary Problem in Two Dimensions

Fang-Hua Lin, Jiajun Tong

摘要:

本文研究了二维Stokes流场中封闭弹性弦的耦合运动,即二维Stokes浸入边值问题。利用斯托克斯方程的基本解和弦的拉格朗日坐标,我们将问题转化为一个轮廓动力学方程,这是一个非线性非局部方程,它只跟踪弦构型的演化。我们证明了从一个任意的初始配置,这是一个$H^{5/2}$ -功能在拉格朗日坐标满足所谓的良好拉伸假设的存在性和唯一性的局部时间的解决方案。我们还证明了当初始弦构型足够接近平衡态时,即当初始弦构型是均匀参数化的圆形构型时,时间上的全局解唯一存在,并且它将以$t\rightarrow +\infty$的形式指数收敛到平衡态.本文的方法也适用于三维Stokes浸入边值问题。

英文摘要:

We study coupled motion of a 1-D closed elastic string immersed in a 2-D Stokes flow, known as the Stokes immersed boundary problem in two dimensions. Using the fundamental solution of the Stokes equation and the Lagrangian coordinate of the string, we write the problem into a contour dynamic formulation, which is a nonlinear non-local equation solely keeping track of evolution of the string configuration. We prove existence and uniqueness of local-in-time solution starting from an arbitrary initial configuration that is an $H^{5/2}$-function in the Lagrangian coordinate satisfying the so-called well-stretched assumption. We also prove that when the initial string configuration is sufficiently close to an equilibrium, which is an evenly parameterized circular configuration, then global-in-time solution uniquely exists and it will converge to an equilibrium configuration exponentially as $t\rightarrow +\infty$. The technique in this paper may also apply to the Stokes immersed boundary problem in three dimensions.

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