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arXiv math/0407365math.AP
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关于不可压缩粘性流体中弹性固体的运动

On the motion of an elastic solid inside of an incompressible viscous fluid

Daniel Coutand, Steve Shkoller

摘要:

弹性固体在不可压缩粘性流体中的运动在自然界中是普遍存在的。从数学上讲,这种运动是由耦合抛物和双曲相的PDE系统描述的,后者导致了规律性的丧失,这使得存在的基本问题至今尚未解决。在本文中,我们证明了这种运动的存在性和唯一性(局部时间),当弹性固体是线性Kirchhoff弹性材料。该解决方案是使用拓扑不动点定理,需要分析的线性问题组成的时间相关的Navier-斯托克斯方程之间的耦合设置在拉格朗日变量和弹性动力学的线性方程,我们证明了存在一个唯一的弱解。然后,我们建立弱解的正则性;这种正则性是在函数空间中获得的,该函数空间在流体和固体相中都以双曲方式缩放。我们的功能框架是最佳的,并提供了必要的先验估计,我们采用我们的定点程序。

英文摘要:

The motion of an elastic solid inside of an incompressible viscous fluid is ubiquitous in nature. Mathematically, such motion is described by a PDE system that couples the parabolic and hyperbolic phases, the latter inducing a loss of regularity which has left the basic question of existence open until now. In this paper, we prove the existence and uniqueness of such motions (locally in time), when the elastic solid is the linear Kirchhoff elastic material. The solution is found using a topological fixed-point theorem that requires the analysis of a linear problem consisting of the coupling between the time-dependent Navier-Stokes equations set in Lagrangian variables and the linear equations of elastodynamics, for which we prove the existence of a unique weak solution. We then establish the regularity of the weak solution; this regularity is obtained in function spaces that scale in a hyperbolic fashion in both the fluid and solid phases. Our functional framework is optimal, and provides the a priori estimates necessary for us to employ our fixed-point procedure.

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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