arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2111.06239math.AP
收藏

不可压缩牛顿流体与弹性板相互作用的时间周期弱解

Time-periodic weak solutions for an incompressible Newtonian fluid interacting with an elastic plate

Claudiu Mîndrilă, Sebastian Schwarzacher

摘要:

本文证明了在周期外力作用下,由Navier-Stokes方程斯托克斯方程控制的三维不可压缩流体与二维弹性板相互作用问题至少存在一个周期弱解.挑战在于,流体的欧拉域随时间变化,并且是解决方案的一部分。我们引入了两个不动点方法:首先,我们构造一个给定的可变时间周期几何的时间周期解。然后,在第二步骤中,执行(集值)不动点。域的几何形状。存在依赖于新开发的先验估计适用于耦合和非耦合的可变几何形状。由于预期的弱正则性的解决方案,这样的欧拉估计是不可避免的。特别要注意的是,只有流体被假定为耗散的。但这里产生的先验估计表明,利用流体的耗散效应也可以用于固体变形。对于任意大的数据,给定几何条件下周期解的存在性是有效的。流体-结构相互作用的周期耦合解的存在性对于排除自相交先验的所有数据都是有效的。

英文摘要:

Under the action of a time-periodic external forces we prove the existence of at least one time-periodic weak solution for the interaction between a three-dimensional incompressible fluid, governed by the Navier- Stokes equation and a two dimensional elastic plate. The challenge is that the Eulerian domain for the fluid changes in time and is a part of the solution. We introduce a two fixed-point methodology: First we construct a time-periodic solutions for a given variable time-periodic geometry. Then in a second step a (set-valued) fixed point is performed w.r.t.\ the geometry of the domain. The existence relies on newly developed a-priori estimates applicable for both coupled and uncoupled variable geometries. Due to the expected weak regularity of the solutions such Eulerian estimates are unavoidable. Note in particular, that only the fluid is assumed to be dissipative. But the here produced a-priori estimates show that its possible to exploit the dissipative effects of the fluid also for the solid deformation. The existence of periodic solutions for a given geometry is valid for arbitrary large data. The existence of periodic coupled solutions to the fluid-structure interaction is valid for all data that excludes a self-intersection a-priori.

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。

↑