Steady internal water waves with a critical layer bounded by the wave surface

Details Steady internal water waves with a critical layer bounded by the wave surface Steady internal water waves with a critical layer bounded by the wave surface

2012-02-14

arxiv.org/abs/1202.3029v1

Journal of Nonlinear Mathematical Physics, Vol. 19, No. 1 (2012) 1-21

Mathematics

Analysis of PDEs

20 pages, 1 figure

Scientific paper

10.1142/S1402925112001903

In this paper we construct small amplitude periodic internal waves traveling at the boundary region between two rotational and homogeneous fluids with different densities. Within a period, the waves we obtain have the property that the gradient of the stream function associated to the fluid beneath the interface vanishes, on the wave surface, at exactly two points. Furthermore, there exists a critical layer which is bounded from above by the wave profile. Besides, we prove, without excluding the presence of stagnation points, that if the vorticity function associated to each fluid in part is real-analytic, bounded, and non-increasing, then capillary-gravity steady internal waves are a priori real-analytic. Our new method provides the real-analyticity of capillary and capillary-gravity waves with stagnation points traveling over a homogeneous rotational fluid under the same restrictions on the vorticity function.

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