Surface gravity waves in deep fluid at vertical shear flows

Details Surface gravity waves in deep fluid at vertical shear flows Surface gravity waves in deep fluid at vertical shear flows

2005-09-28

arxiv.org/abs/astro-ph/0509846v1

Astronomy and Astrophysics

Astrophysics

JETP, accepted

Scientific paper

10.1134/1.2010673

Special features of surface gravity waves in deep fluid flow with constant vertical shear of velocity is studied. It is found that the mean flow velocity shear leads to non-trivial modification of surface gravity wave modes dispersive characteristics. Moreover, the shear induces generation of surface gravity waves by internal vortex mode perturbations. The performed analytical and numerical study provides, that surface gravity waves are effectively generated by the internal perturbations at high shear rates. The generation is different for the waves propagating in the different directions. Generation of surface gravity waves propagating along the main flow considerably exceeds the generation of surface gravity waves in the opposite direction for relatively small shear rates, whereas the later wave is generated more effectively for the high shear rates. From the mathematical point of view the wave generation is caused by non self-adjointness of the linear operators that describe the shear flow.

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