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Une "synthetic-eddy-method" pour représenter la turbulence ambiante dans des simulations numériques d'hydroliennes : validation avec des essais expérimentaux ArchiMer
Carlier, Clement; Fur, Arnaud; Pinon, G; Gaurier, Benoit; Germain, Gregory; Rivoalen, E.
Le developpement de fermes d'hydroliennes est un sujet de recherche actif depuis quelques annees. Cependant, des etudes sont encore necessaire pour comprendre le comportement de tels parcs. Un des sujets porte sur l'influence de la turbulence ambiante sur les machines. Des etudes recentes ont ainsi montre que le taux de turbulence ambiant d'un ecoulement modifiait enormement le comportement des turbines. En consequence, les simulations numeriques se doivent de reproduire l'effet de la turbulence ambiante, du moins son influence sur les performances et sur le sillage des turbines. Ce papier presente les derniers developpements numeriques realises dans le but de prendre en compte les effets de la turbulence ambiante sur le comportement d'hydroliennes a axe...
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00367/47868/47865.pdf
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Account of ambient turbulence for turbine wakes using a Synthetic-Eddy-Method ArchiMer
Pinon, Gregory; Carlier, Clement; Fur, Arnaud; Gaurier, Benoit; Germain, Gregory; Riyoalen, Elie.
The present paper aims at describing the use of a Synthetic-Eddy-Method (SEM), initially proposed by Jarrin et al. [12], in the 3D Lagrangian Vortex method framework. The SEM method is used here in order to generate a far-field incoming flow with a prescribed ambient turbulence intensity. However, for the account of the diffusive term in the Navier-Stokes equations, a classical Particle Strength Exchange model with a LES eddy viscosity is used. Firstly, the general characteristics of the Synthetic-Eddy-Method will be presented together with its integration in the framework of the developed 3D unsteady Lagrangian Vortex software [27]. The capability of the ambient turbulence model to reproduce a perturbed flow that verifies any turbulence intensity I∞ and...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00389/50002/50587.pdf
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A stochastic method to account for the ambient turbulence in Lagrangian Vortex computations ArchiMer
Choma Bex, Camille; Carlier, Clement; Fur, Arnaud; Pinon, Gregory; Germain, Gregory; Rivoalen, Elie.
This paper describes a detailed implementation of the Synthetic Eddy Method (SEM) initially presented in Jarrin et al. (2006) applied to the Lagrangian Vortex simulation. While the treatment of turbulent diffusion is already extensively covered in scientific literature, this is one of the first attempts to represent ambient turbulence in a fully Lagrangian framework. This implementation is well suited to the integration of PSE (Particle Strength Exchange) or DVM (Diffusion Velocity Method), often used to account for molecular and turbulent diffusion in Lagrangian simulations. The adaptation and implementation of the SEM into a Lagrangian method using the PSE diffusion model is presented, and the turbulent velocity fields produced by this method are then...
Tipo: Text Palavras-chave: Ambient turbulence; Synthetic Eddy Method; Lagrangian method; Turbulence; Vortex method; Wake.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00652/76458/77550.pdf
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