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arXiv 1402.0464math.AP
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带涡量水波方程新Hamilton形式的适定性和浅水稳定性

Well-posedness and shallow-water stability for a new Hamiltonian formulation of the water waves equations with vorticity

Angel Castro, David Lannes

摘要:

在本文中,我们得到了一个新的提法水波方程的涡度,推广了著名的Zalkarov-Craig-Sulem制定的无旋情况下使用。我们证明了该公式的局部适定性,并证明了它是形式上的Hamilton。这个新的公式是铸造在欧拉变量,并在有限的深度,我们表明,它可以用来提供统一的边界上的寿命和规范的解决方案在奇异浅水区。作为这些结果的应用,我们推导并提供了第一个严格的理由,浅水模型的水波涡的存在,我们特别表明,第三个方程必须添加到标准模型,以恢复速度在表面的平均速度。

英文摘要:

In this paper we derive a new formulation of the water waves equations with vorticity that generalizes the well-known Zalkarov-Craig-Sulem formulation used in the irrotational case. We prove the local well-posedness of this formulation, and show that it is formally Hamiltonian. This new for- mulation is cast in Eulerian variable, and in finite depth; we show that it can be used to provide uniform bounds on the lifespan and on the norms of the solutions in the singular shallow water regime. As an application to these re- sults, we derive and provide the first rigorous justification of a shallow water model for water waves in presence of vorticity; we show in particular that a third equation must be added to the standard model to recover the velocity at the surface from the averaged velocity.

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