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Modélisation expérimentale et numérique des états de mer complexes

Abstract : The study of directional waves belongs to the top priorities of the Laboratoire de Mécanique des Fluides, recently equipped with a large-sized wave basin. To exploit these new capacities as well as possible, the objective of this PhD is to acquire competences relating to as much the generation of the directional waves and the data analysis as the fine comprehension of the nonlinear phenomena involved with waves.
To help the comprehension and control of these nonlinear effects, two numerical time domain models are developed and validated, reproducing all the features of the physical basin (segmented wavemaker, sidewalls, absorbing beach, finite depth). Both based on a spectral method of resolution of the potential equations, the first one is developed at second order in wave steepness while the second accounts for the fully nonlinear equations through an High-Order Spectral approximation.
Generation techniques using sidewalls reflection to increase the size of the usable zone in case of oblique waves are implemented in both numerical of physical basins. A second order frequency domain analytical solution of the generation problem for oblique waves is developed and leads to the correction of the wavemaker motion to suppress the spurious free waves due to non-linearities on the wavemaker.
The problem of the deterministic reproduction of steep events is tackled. In 2D, an original third order technique is proposed to accurately estimate the nonlinear phase velocities required to build the wavemaker motion. In 3D, a linear approach is followed to deal with the directionality of the focusing waves.
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Contributor : Félicien Bonnefoy <>
Submitted on : Thursday, September 8, 2005 - 10:17:23 AM
Last modification on : Monday, January 27, 2020 - 11:20:11 PM
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Félicien Bonnefoy. Modélisation expérimentale et numérique des états de mer complexes. Sciences de l'ingénieur [physics]. Université de Nantes, 2005. Français. ⟨tel-00010065⟩

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