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arXiv 2201.01949math.AP
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流体+圆盘系统的无界能量解和大初始数据下的长时间行为

Unbounded-energy solutions to the fluid+disk system and long-time behavior for large initial data

Guillaume Ferriere, Matthieu Hillairet

摘要:

本文分析了二维粘性不可压缩流体中刚性圆盘运动的耦合系统解的长时间行为。按照以前的方法,我们看问题的坐标系与磁盘的质心。这样做,我们引入了进一步的非线性的经典Navier斯托克斯方程。与经典的非线性项相比,这个新的项缺乏时间和空间的可积性,从而大大增加了分析解的长时间行为的复杂性。我们在这里提供了两个完善的工具:Gagliardo-Nirenberg不等式的精细分析和所谓的流体结构算子的分数幂的彻底描述。在这两个工具的基础上,我们将以前的衰减估计扩展到任意的初始数据,并显示局部稳定的Lamb-Oseen涡。

英文摘要:

In this paper, we analyse the long-time behavior of solutions to a coupled system describing the motion of a rigid disk in a 2D viscous incompressible fluid. Following previous approaches, we look at the problem in the system of coordinates associated with the center of mass of the disk. Doing so, we introduce a further nonlinearity to the classical Navier Stokes equations. In comparison with the classical nonlinearities, this new term lacks time and space integrability, thus complicating strongly the analysis of the long-time behavior of solutions. We provide herein two refined tools : a refined analysis of the Gagliardo-Nirenberg inequalities and a thorough description of fractional powers of the so-called fluid-structure operator. On the basis of these two tools we extend previous decay estimates to arbitrary initial data and show local stability of the Lamb-Oseen vortex.

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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