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| Registros recuperados: 30 | |
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| Maisondieu, Christophe; Clément, Alain. |
| We consider the problem of the absorption of 2D water waves by the horizontal motions of a vertical plane in response to the hydrodynamical force it experiences. The solution of this problem is straightforward in the frequency domain. Unfortunately, the transposition of the frequency domain solution to the time domain by inverse Fourier transforming leads to a non-causal impulse response function. Thus it cannot be used just as it is, neither as a control loop for physical absorbing devices nor as a non radiating boundary condition (NRBC) in numerical modeling. In this paper, we propose a method to derive causal approximations of this ideal controller. Two time-domain absorbing relations are proposed, differing in whether or not one knows a dominant... |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00203/31436/29832.pdf |
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| Boudiere, Edwige; Maisondieu, Christophe; Ardhuin, Fabrice; Accensi, Mickael; Pineau-guillou, Lucia; Lepesqueur, Jeremy. |
| Resource assessment as well as characterisation of site climatologies for the design of Marine Energy Converters requires data bases allowing an accurate description of the environmental forcing, especially waves and sea-states, on a high resolution grid. As a support to its research activities related to the development of marine renewable energies, Ifremer is building a specific hindcast data set for the assessment of sea-states climatologies. The main features of this database, built running an up-to-date configuration of the WaveWatch III® wave model on an unstructured grid extending from the South of the North Sea to the Bay of Biscay are presented here. Attention is given to the parameterization and forcing as well as the specific output data sets... |
| Tipo: Text |
Palavras-chave: Directional spectra; Hindcast; WAVEWATCH III®; Marine renewable energy. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00164/27524/25710.pdf |
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| Guanche Garcia, Yanira; Prevosto, Marc; Maisondieu, Christophe; Bulteau, Thomas; Paris, François. |
| The knowledge of extreme events of environmental variables is an issue of increasing concern to the scientific community. Within the branch of coastal and ocean engineering there are many fields of application where an accurate estimation of long term return period events is needed, i.e. coastal defenses design, coastal flooding management, estimation of changes of the littoral morphology, offshore and onshore renewable energy devices design, etc. But not only the engineers are concerned by extreme events; biological communities in the open sea and estuarine systems are also exposed to extreme events that may affect its natural development (i.e. extreme sea levels in estuarine environments could raze fields of plants not able to deal with salt in just a... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00378/48967/49370.pdf |
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| Maisondieu, Christophe; Le Boulluec, Marc. |
| When considering deployment of wave energy converters at a given site, it is of prime importance from both a technical and an economical point of view to accurately assess the total yearly energy that can be extracted by the given device. Especially, to be considered is the assessment of the efficiency of the device over the widest span of the sea-states spectral bandwidth. Hence, the aim of this study is to assess the biases and errors introduced on extracted power classically computed using spectral data derived from analytical functions such as a JONSWAP spectrum, compared to the power derived using actual wave spectra obtained from a spectral hindcast database. |
| Tipo: Text |
Palavras-chave: Wave energy; Wave spectra; Hindcast; Resource assessment. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00347/45799/45445.pdf |
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| Maisondieu, Christophe; Johanning, Lars. |
| This report is a deliverable of MERiFIC Task 3. 6: ‘Installation Procedures’ and has been produced in a cross border collaboration between IFREMER and the University of Exeter. In this report different elements are presented for the planning and organisation of installation operations for the deployment of Marine energy plants. The optimization of installation procedures are discussed and brought in a context to potential costs optimization and the availability of suitable vessels is considered. Installation procedures, which were also investigated, should include pre-installation surveys so as to optimize the design of moorings and secure laying of the power cable, a specific feature of the commissioning of such Marine energy plants. Attention should... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00203/31445/29843.pdf |
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| Maisondieu, Christophe; Johanning, Lars; Weller, Samuel. |
| This report is a deliverable of MERiFIC Work Package 3.6: ‘Operation and Maintenance requirements’ and has been produced as a cross border collaboration between IFREMER and the University of Exeter. The report provides an overview of guidelines and recommendations for the management of O&M operations necessary for an optimal exploitation of Marine energy plants, with a focus on the specific areas of South West Cornwall, UK and Iroise sea, Brittany, France. An overview of the onshore infrastructures and ports possibly suitable for management of such O&M operations is also provided. Management of scheduled and unscheduled maintenance operations are discussed in their various aspects including site accessibility. It should be noted that this topic,... |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00203/31443/29841.pdf |
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| Clement, Alain; Maisondieu, Christophe. |
| In this paper, we suggest two causal non-ideal approximations of this ideal non-causal controller. These time-domain absorbing relations differ in whether or not one knows a dominant frequency of the incident wave train to be absorbed. Their performances are compared to the absorption efficiency of the low frequency asymptotic Sommerfeld relation. Preliminary results of this study were already presented in Maisondieu and al. (1993). |
| Tipo: Text |
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| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00203/31437/29833.pdf |
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| Maisondieu, Christophe; Forest, Bertrand. |
| The SAR-DRIFT project aims at developing a forecast system for localisation of drifting objects, as well as decision aid tools for Maritime Search and Rescue. Its basic principle is to predict the position of drifting objects, when combining environmental measurements and forecast through sophisticated stochastic modelling. Among the different tasks of the project, one is to assess the hydrodynamic behaviour of various objects drifting at sea when submitted to the joint action of wind, waves and currents. Thousands of cargo containers are reported to fall overboard each year. A significant part of these containers will stay afloat from several hours to several weeks and represent a major hazard to navigation. In order to evaluate the drift coefficients of... |
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| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/00238/34970/33472.pdf |
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| Venugopal, Vengatesan; Davey, Thomas; Smith, Helen; Smith, George; Holmes, Brian; Barrett, Sean; Prevosto, Marc; Maisondieu, Christophe; Cavalieri, Luigi; Bertotti, Luciana; Lawrence, John; Girard, Francoise. |
| This report gives guidance relevant to the resource assessment of sites considered for the deployment of wave and tidal energy converters. Areas considered include: instrumentation and measurement; techniques and requirements for wave and tidal parameterisation; wave-current interaction; spatial and temporal variation. A number of case studies are also included examining several European sites. |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00250/36152/34706.pdf |
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| Boudiere, Edwige; Maisondieu, Christophe; Ardhuin, Fabrice; Accensi, Mickael; Pineau-guillou, Lucia; Lepesqueur, Jeremy. |
| The number of Marine Renewable Energy projects has rapidly raised over the last decades. Those require a refined description of environmental conditions, such as sea states, for resource assessments as well as for the conception of the Marine Energy Converters. Engineering studies require long-term data sets so as to assess temporal variability and extreme events of sea states at the scale of the implantation sites.,As a support to its research studies on Marine Renewable Energy, Ifremer is building a specific hindcast database, running the wave model WAVEWATCH III® on an unstructured grid. The wave model extends over the area from the South of the North Sea to the Bay of Biscay with a high spatial resolution and covers a 16 years period from 1996 to 2012.... |
| Tipo: Text |
Palavras-chave: Spectre directionnel; Hindcast; WAVEWATCH III®; Énergie marine renouvelable; Directional spectra; Hindcast; WAVEWATCH III®; Marine renewable energy. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00203/31418/29813.pdf |
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| Vyzikas, Thomas; Stagonas, Dimitris; Maisondieu, Christophe; Greaves, Deborah. |
| NewWave-type focused wave groups are commonly used to simulate the design wave for a given sea state. These extreme wave events are challenging to reproduce numerically by the various Numerical Wave Tanks (NWTs), due to the high steepness of the wave group and the occurring wave-wave interactions. For such complex problems, the validation of NWTs against experimental results is vital for confirming the applicability of the models. Intercomparisons among different solvers are also important for selecting the most appropriate model in terms of balancing between accuracy and computational cost. The present study compares three open-source NWTs in OpenFOAM, SWASH and HOS-NWT, with experimental results for limiting breaking focused wave groups. The comparison... |
| Tipo: Text |
Palavras-chave: Extreme waves; Focused waves; Dispersion; Harmonic analysis; CFD; OpenFOAM; SWASH; HOS. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00665/77755/79880.pdf |
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| Maisondieu, Christophe; Accensi, Mickael; Le Roux, Jean-francois; Boudière, Edwige. |
| La base de données de rejeu d'états de mer HOMERE a été mise en place par les équipes de l'Ifremer du laboratoire de Comportement des Structures en Mer (RDT/LCSM) et du Laboratoire d'Océanographie Physique et Spatiale (LOPS). Cette base de données consiste en un ensemble de paramètres permettant de décrire les caractéristiques principales et l'évolution des conditions d'états de mer sur la zone de la Manche et du Golfe de Gascogne. Initialement développée pour répondre aux besoins liés aux études sur la caractérisation de la ressource et du comportement des structures en mer, en particulier dans le domaine des énergies marines renouvelables, son champ d’application est en fait, de par l’ensemble des paramètres et l’information spectrale disponibles, mais... |
| Tipo: Text |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00415/52606/53440.pdf |
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| Registros recuperados: 30 | |
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