An asymptotic model for the Kelvin-Helmholtz and Miles mechanisms of water wave generation by wind

Details An asymptotic model for the Kelvin-Helmholtz and Miles mechanisms of water wave generation by wind An asymptotic model for the Kelvin-Helmholtz and Miles mechanisms of water wave generation by wind

2008-04-15

arxiv.org/abs/0804.2411v1

Physics

Fluid Dynamics

Scientific paper

10.1063/1.2980350

The generalized Kelvin-Helmholtz (KH) and Miles mechanisms of the water wave generation by wind are investigated for two-layer piece-wise linear model of the wind profile. It is shown by asymptotic expansions in small air-to-water density ratio that two mechanisms of the instability operate in quite different scales. Miles' short waves are generated by weak winds, in particular, Miles' regime is responsible for initiation of the instability at the minimum wind speed, while the generalized KH regime dominates at strong winds and raises moderately-short waves.

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