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Development of a deterministic numerical model for the study of the coupling between an atmospheric flow and a sea state

Abstract : Modelling the dynamic coupling of ocean-atmosphere systems requires a fundamental and quantitative understanding of the mechanisms governing the windwave interactions: despite numerous studies, our current understanding remains quite incomplete and, in certain conditions, sparse field observations contradict the usual theoretical and stochastic models. Within the context of a growing exploitation of the offshore wind energy and the development of met ocean models, a fine description of this resource is a key issue. Field experiments and numerical modelling have revealed that atmospheric stability and wave effects, including the dynamic sea surface roughness, are two major factors affecting the wind field over oceans. A numerical tool has been implemented in order to study the coupling between an atmospheric flow and the seastate. A massively parallel large-eddy simulation developed by P. Sullivan at the National Center for Atmospheric Research is then coupled to a High-Order Spectral wave model developed at the Hydrodynamics,Energetics & Atmospheric Environment Laboratory in Ecole Centrale de Nantes. Numerous configurations of wind and sea states are investigated. It appears that, under strongly forced wind conditions above a small sea state, the semi-empirical laws referred to as standards in the international guidelines are a good approximation for the vertical profile of the mean wind speed. However, for light winds overlying fast-moving swell, the presence of a wave induced wind jet is observed, invalidating the use of such logarithmic laws.
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Submitted on : Thursday, May 9, 2019 - 11:47:10 AM
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  • HAL Id : tel-02124072, version 1

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Marie Cathelain. Development of a deterministic numerical model for the study of the coupling between an atmospheric flow and a sea state. Fluids mechanics [physics.class-ph]. École centrale de Nantes, 2017. English. ⟨NNT : 2017ECDN0001⟩. ⟨tel-02124072⟩

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