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Simulation numérique de l'interaction houle-structure en fluide visqueux par décomposition fonctionnelle

Abstract : Functional decomposition in the Navier-Stokes equations is a mathematical tool which takes advantage of the fact that the swell propagation and the evolution of the diffracted field from a body are two phenomena with different spatial scales. The principal unknowns of the problem are divided into an incident part representing the swell propagation and a diffracted part representing the perturbation due to the presence of the floating or submerged body. This decomposition is then introduced in the Reynolds-averaged Navier-Stokes equations. Potential flow theory (more precisely spectral methods) is used to compute the incident waves while viscous effects are taken into account by using a modified RANSE solver to obtain the diffracted field in the full domain. By using this approach it is possible to simulate various nonlinear incident waves in an efficient and accurate manner: regular wave trains, focused waves, irregular 2D or 3D sea states. The present work is a contribution to the development of the SWENSE (Spectral Wave Explicit Navier-Stokes Equations) method and offers several validation cases in regular sea as well as in irregular sea. The limitations of the method in its current form are discussed, especially the over-breaking problem, and answers to them are provided.
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https://tel.archives-ouvertes.fr/tel-00600669
Contributor : Charles Monroy <>
Submitted on : Wednesday, June 15, 2011 - 3:49:14 PM
Last modification on : Thursday, January 11, 2018 - 6:17:20 AM
Long-term archiving on: : Friday, September 16, 2011 - 1:16:02 PM

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  • HAL Id : tel-00600669, version 1

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Charles Monroy. Simulation numérique de l'interaction houle-structure en fluide visqueux par décomposition fonctionnelle. Dynamique des Fluides [physics.flu-dyn]. Ecole Centrale de Nantes (ECN), 2010. Français. ⟨tel-00600669⟩

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