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arXiv 1702.04378physics.flu-dyn
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振动流体的浅水模型

Shallow-water models for a vibrating fluid

Konstantin Ilin

摘要:

我们考虑一层无粘流体的自由表面,这是受到垂直高频振动。我们推导出三个渐近方程组,描述缓慢发展(与振动频率相比)的自由表面波。第一组方程是在没有假定波是长的情况下得到的。这些方程和非振动流体中无旋水波的精确方程一样难以求解。另外两个模型描述的是长波。这些模型是在关于振动幅度的两种不同假设下获得的。令人惊讶的是,两种情况下的控制方程具有完全相同的形式(直到某些常数的解释)。如果不存在振动,这些方程简化为标准的无色散浅水方程,并且振动通过使方程色散的附加项来体现,对于小振幅波,该附加项类似于如果考虑表面张力时出现的项。我们表明,我们的色散浅水方程有孤立波和周期行波解,并讨论这些解决方案和非振动流体中的毛细重力波之间的类比。

英文摘要:

We consider a layer of an inviscid fluid with free surface which is subject to vertical high-frequency vibrations. We derive three asymptotic systems of equations that describe slowly evolving (in comparison with the vibration frequency) free-surface waves. The first set of equations is obtained without assuming that the waves are long. These equations are as difficult to solve as the exact equations for irrotational water waves in a non-vibrating fluid. The other two models describe long waves. These models are obtained under two different assumptions about the amplitude of the vibration. Surprisingly, the governing equations have exactly the same form in both cases (up to interpretation of some constants). These equations reduce to the standard dispersionless shallow-water equations if the vibration is absent, and the vibration manifests itself via an additional term which makes the equations dispersive and, for small-amplitude waves, is similar to the term that would appear if surface tension were taken into account. We show that our dispersive shallow water equations have both solitary and periodic travelling waves solutions and discuss an analogy between these solutions and travelling capillary-gravity waves in a non-vibrating fluid.

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