Consulta: subjectFacets:"Fluid-structure interaction"
Registros recuperados: 6
Data/hora: 05/06/2024 16:15:12

Power estimates of an undulating membrane tidal energy converter
Provedor de dados: 5
Autores: Trasch, Martin; Deporte, Astrid; Delacroix, Sylvain; Drevet, Jean-baptiste; Gaurier, Benoit; Germain, Gregory.
An experimental study of an undulating membrane based on the Eel Energy device is presented in this paper. This system uses interaction between a semi-rigid plate and an axial flow to generate undulation. At full scale, the deformation of the structure is then converted into electrical power using linear electromagnetic generators. In order to simulate the power take-off on a 1/20th scale prototype, hydraulic dampers are located all over the length of the device. The dampers have non-linear behaviour. A representative damping parameter have been introduced to study their impact. Results are presented in function of fluid velocity and damping adjustment. Undulation mode, frequency and forces on the structure are described. Results show that fluid velocity...
Tipo: Text
Palavras-chave: Marine renewable energy; Tidal energy converter; Power take-off; Fluid-structure interaction; Flume tank.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00411/52205/53359.pdf

Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante
Provedor de dados: 5
Autores: Trasch, Martin.
The thesis presented in this document deals with the caracterisation of the behaviour of an undulating membrane tidal energy converter. This kind of device uses the flutter instabilities occurring between a semi-rigid pre-strained membrane and a fluid flow in order to convert the sea currents energy. Above a certain critical flow speed, the structure ondulates, thus activating the linear converters fixed on it. In order to study this system, an experimental model is developped and tested in a flume tank. The power conversion system is simulated by hydraulic dampers. The membrane’s dynamics is analysed in many configurations through trajectory and force measurements, and leads to a parametric study. More realistic flow conditions are also studied, such as...
Tipo: Text
Palavras-chave: Énergies marines renouvelables; Hydrolienne; Interaction fluidestructure; Instabilité de flottement; Essais expérimentaux; Particle Image Velocimetry; Modélisation numérique; Méthode vortex; Éléments finis; Corotationnel; Houle; Effet d’échelle; Marine renewable energy; Tidal energy converter; Power takeoff; Fluid-structure interaction; Flutter instability; Experimental trial; Particle Image Velocimetry; Numerical model; Vortex method; Corotational finite elements; Surface wave; Scale effect.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00490/60185/63527.pdf

Analytical linear modelization of a buckled undulating membrane tidal energy converter
Provedor de dados: 5
Autores: Trasch, Martin; Deporte, Astrid; Delacroix, Sylvain; Germain, Gregory; Drevet, Jean-baptiste.
This paper presents an analytical linear model developed to study the behaviour of a buckled membrane tidal energy converter. The Euler beam theory and the elongated body theory are used for the fluid structure interaction formulation. The effect of electromechanical converters used to convert the undulating motion into electrical energy is reproduced by adding a term equivalent to viscous material damping. The influence of compression force, flaps and hanging conditions is studied, as well as the effects of simulated power take-off through internal damping. The system's behaviour is characterized by undulating mode, critical flow velocity, motion frequency and amplitude. The model shows good agreement in terms of frequency and satisfactory results for the...
Tipo: Text
Palavras-chave: Marine renewable energy; Tidal energy converter; Power take-off; Fluid-structure interaction; Slender body theory.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00445/55631/57277.pdf

A 3D study of the bubble sweep-down phenomenon around a 1/30 scale ship model
Provedor de dados: 5
Autores: Mallat, Bachar; Germain, Gregory; Billard, Jean-yves; Gaurier, Benoit.
The bubble sweep-down phenomenon around oceanographic research vessels generates acoustic disturbances. A specific experimental protocol in a wave and current circulating tank is used to study this phenomenon around a 1/30 scale ship model in a configuration with current, waves and ship motions. 3D visualizations of the bubble clouds and Stereo-PIV (Particle Image Velocimetry) measurements results, both obtained in the bow vicinity of the ship model, are presented in this paper. The behaviour of the breaking wave with bubble generation is studied and the spatial evolution of the bubble clouds is investigated. It is demonstrated that the bubble cloud generation is mainly conditioned by the ascending vertical velocity of the flow near the bow. It is observed...
Tipo: Text
Palavras-chave: Bubble sweep-down; Breaking wave; Bow wave; Fluid-structure interaction; Flume tank.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00453/56423/58534.pdf

Wind tunnel investigation of dynamic trimming on upwind sail aerodynamics
Provedor de dados: 5
Autores: Aubin, Nicolas; Augier, Benoit; Sacher, Matthieu; Bot, Patrick; Hauville, Frédéric; Flay, Richard G.j.
An experiment was performed in the Yacht Research Unit’s Twisted Flow Wind Tunnel (University of Auckland) to test the effect of dynamic trimming on three IMOCA 60 inspired mainsail models in an upwind (βAW = 60°) unheeled configuration. This study presents dynamic fluid structureinteractionresultsinwellcontrolledconditions(wind,sheetlength)withadynamictrimming system. Trimming oscillations are done around an optimum value of CFobj previously found with a static trim. Different oscillation amplitudes and frequencies of trimming are investigated. Measurements are done with a 6 component force balance and a load sensor giving access to the unsteady mainsail sheet load. The driving CFx and optimization target CFobj coefficient first decrease at low reduced...
Tipo: Text
Palavras-chave: Wind tunnel; Upwind; Unsteady; Fluid-structure interaction.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00597/70919/69157.pdf

Dynamic behaviour of an undulating membrane tidal energy converter under wave and current loading
Provedor de dados: 5
Autores: Träsch, Martin; Delacroix, Sylvain; Déporte, Astrid; Drevet, Jean-baptiste; Gaurier, Benoit; Germain, Gregory.
The dynamic behaviour of an undulating tidal energy converter under wave and current loadings is studied. Therefore, a small scale prototype of a damped pre-stressed undulating membrane is tested in a wave and current recirculatory tank. The membrane’s dynamic profile and hydrodynamic forces are measured synchronously with the surface elevation for both regular and irregular waves in current direction. Spectrum analysis reveals that the response to wave loading depends on the wave frequency and is reduced by damping-type power take-off. Coupling between the wave frequency and the main undulation frequency or its harmonics is also observed. An increase of 30% of the forces must be foreseen in case of wave condition in the tested range.
Tipo: Text
Palavras-chave: Fluid-structure interaction; Renewable energy; Tidal energy; Undulating membrane; Flume tank; Wave-current interaction.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00623/73485/72834.pdf