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arXiv 1207.0469math.AP
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粘性滑移流固系统碰撞前的弱解存在性

Existence of weak solutions up to collision for viscous fluid-solid systems with slip

David Gérard-Varet, Matthieu Hillairet

摘要:

本文研究了有界区域内不可压缩Navier-Stokes流中刚体的运动。我们考虑的情况下,允许在流体/固体界面处的滑动,通过Navier条件。在这个模型中,考虑界面处的滑移是非常自然的,因为经典的无滑移条件导致固体和域边界之间不切实际的碰撞行为。我们证明了这个模型的存在性弱解的Leray型,碰撞,在三维。关键是,由于滑移条件,速度场在流体/固体界面上是不连续的。这就妨碍了获得速度的全局H1界,这使得Dirichlet条件下的弱解理论的许多方面不适用。

英文摘要:

We study in this paper the movement of a rigid solid inside an incompressible Navier-Stokes flow, within a bounded domain. We consider the case where slip is allowed at the fluid/solid interface, through a Navier condition. Taking into account slip at the interface is very natural within this model, as classical no-slip conditions lead to unrealistic collisional behavior between the solid and the domain boundary. We prove for this model existence of weak solutions of Leray type, up to collision, in three dimensions. The key point is that, due to the slip condition, the velocity field is discontinuous across the fluid/solid interface. This prevents from obtaining global H1 bounds on the velocity, which makes many aspects of the theory of weak solutions for Dirichlet conditions unadapted.

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