Asymptotic models for the generation of internal waves by a moving ship, and the dead-water phenomenon

Details Asymptotic models for the generation of internal waves by a moving ship, and the dead-water phenomenon Asymptotic models for the generation of internal waves by a moving ship, and the dead-water phenomenon

2010-12-29

arxiv.org/abs/1012.5892v2

Mathematics

Analysis of PDEs

To appear in Nonlinearity

Scientific paper

This paper deals with the dead-water phenomenon, which occurs when a ship sails in a stratified fluid, and experiences an important drag due to waves below the surface. More generally, we study the generation of internal waves by a disturbance moving at constant speed on top of two layers of fluids of different densities. Starting from the full Euler equations, we present several nonlinear asymptotic models, in the long wave regime. These models are rigorously justified by consistency or convergence results. A careful theoretical and numerical analysis is then provided, in order to predict the behavior of the flow and in which situations the dead-water effect appears.

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