Turbulence, vorticity, viscosity, unsteadiness and wind-wave interaction

Sjyang_waveGenerationMany of the topics — turbulence, vorticity, viscosity, unsteadiness, and wind — that are normally neglected in the theory of water waves all formed part of the talk of Shahrdad Sajjadi.  He started with a review of the Miles (1957) theory, which is based on the idea that a critical layer in the wind field enhances energy transfer from the wind to the wave.   He then talked about the Belcher & Hunt (1993) theory which improves the Miles theory by including linear instability with turbulent stress.  Then recent results on unsteady critical layers were presented, based on analysis and direct numerical simulation.  The talk ended with comments about the implications of wave groups. A video of the talk is available here.

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