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arXiv 1912.06396math.AP
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包含可能接触的流束问题的存在性理论

On an existence theory for a fluid-beam problem encompassing possible contacts

Jean-Jérôme Casanova, Céline Grandmont, Matthieu Hillairet

摘要:

本文考虑一个偏微分方程的耦合系统,模拟二维不可压缩粘性流体与位于流体域边界上部的一维弹性梁之间的相互作用。我们设计了一个函数框架来定义弹性梁与流体腔底部接触时的弱解。然后,我们证明,这样的解决方案存在于全球的时间,无论可能的接触近似的梁方程的阻尼梁,让这个额外的粘度消失。

英文摘要:

In this paper we consider a coupled system of pdes modelling the interaction between a two--dimensional incompressible viscous fluid and a one--dimensional elastic beam located on the upper part of the fluid domain boundary. We design a functional framework to define weak solutions in case of contact between the elastic beam and the bottom of the fluid cavity. We then prove that such solutions exist globally in time regardless a possible contact by approximating the beam equation by a damped beam and letting this additional viscosity vanish.

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