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	Provedor de dados ArchiMer (5) Autor Pichot, Geraldine (5) Lewandowski, Roger (2) Germain, Gregory (1) Priour, Daniel (1) Palavra-chave Fluid mechanics (3) Fishing nets (2) Turbulence (2) Turbulence models (2) Variational formulations (2) Elliptic equations (1) Experimental study (1) Finite Element Method (1) Fluid structure interactions (1) Fluid/structure interactions (1) Fluids mechanics (1) Formulations variationnelles (1) Hydrodynamics (1) Intéractions fluide/structure (1) Laser velocimetry (1) Modelling (1) Modélisation (1) Mécanique des fluides (1) Méthode des éléments finis (1) Numerical simulations (1) Mais... Tipo do documento Text (5) Ano 2009 (1) 2008 (1) 2007 (3) País France (5) Idioma Inglês (4) Francês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última On the experimental study of the flow around a fishing net ArchiMer Pichot, Geraldine; Germain, Gregory; Priour, Daniel. Selectivity of fishing gears like trawls is obviously conditioned by the fish behaviour but also by the net and the flow. As well, flow may affect fish behaviour. With the aim of a better understanding of the flow in presence of a net and a catch, we suggest, through the experimental study below, to determine and to analyze the flow over a rigid cod-end in two configurations: with a closed and an open net entrance. Trials took place in a free surface flume tank and the flow characteristics were determined from velocity measurements obtained by laser velocimetry (inside, outside and through the meshes of the stiff cod-end). The experimental device, the measures and their analyzes are given here. Tipo: Text Palavras-chave: Turbulence; Laser velocimetry; Fluid structure interactions; Experimental study; Hydrodynamics; Fluid mechanics. Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-4701.pdf Proceedings in flow modelling in the surroundings of the end part of a trawl ArchiMer Pichot, Geraldine. This paper is devoted to the presentation of modelling procedures and of numerical simulations of the flow in the surroundings of the end part of a trawl, where fish are caught. We present first the hydrodynamical data collected in November 2004 at the IFREMER tank of Boulogne-sur-Mer around and inside an axisymmetric rigid net model. Then we show the use of averaged Navier-Stokes/Brinkman equations with an eddy viscosity coupled with an equation for the turbulent kinetic energy (TKE) (RANS type model of order one) as for a turbulent fluid model. Finally, we test this last model by comparing the numerical results obtained with the code that we have written in Freefem++ and the experimental data available. Tipo: Text Palavras-chave: Fluids mechanics; Turbulence models; Fishing nets. Ano: 2008 URL: https://archimer.ifremer.fr/doc/00479/59098/61736.pdf On the turbulent flow around a fishing net ArchiMer Lewandowski, Roger; Pichot, Geraldine. We consider the flow around a rigid fishing net. We describe the model and show an existence result. Numerical results are shown and compared with experimental data. Tipo: Text Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2455.pdf Modélisation et analyse numérique du couplage filet-écoulement hydrodynamique dans une poche de chalut ArchiMer Pichot, Geraldine. We are interested in the numerical simulation of the catch process at the end part of a trawl. The study of previous works emphasizes the lack of a convincing flow model. The need of a physical understanding of the flow leads us to perform experimental campaigns around a rigid cod-end net model, whose results are given in the manuscript. We propose a model based on the Navier-Stokes/Brinkman equations coupled to an equation for the turbulent kinetic energy by the means of an eddy viscosity, with appropriate boundary conditions. Existence of a weak solution to our coupled problem is proved in dimension 2. Then, we present the axisymmetric code we developed, called SeaNet. We set the parameters of the model and validate the code by comparison with the... Tipo: Text Palavras-chave: Finite Element Method; Numerical simulations; Variational formulations; Modelling; Fluid/structure interactions; Turbulence; Fluid mechanics; Selectivity of fishing gear; Méthode des éléments finis; Simulations numériques; Formulations variationnelles; Modélisation; Intéractions fluide/structure; Turbulence; Mécanique des fluides; Sélectivité des engins de pêche. Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3350.pdf Numerical simulation of water flow around a rigid fishing net ArchiMer Lewandowski, Roger; Pichot, Geraldine. This paper is devoted to the simulation of the flow around and inside a rigid axisymmetric net. We describe first how experimental data have been obtained. We show in detail the modelization. The model is based on a Reynolds Averaged Navier-Stokes turbulence model penalized by a term based on the Brinkman law. At the out-boundary of the computational box, we have used a "ghost" boundary condition. We show that the corresponding variational problem has a solution. Then the numerical scheme is given and the paper finishes with numerical simulations compared with the experimental data. (c) 2007 Elsevier B.V. All rights reserved. Tipo: Text Palavras-chave: Fishing nets; Sobolev spaces; Variational formulations; Elliptic equations; Turbulence models; Fluid mechanics. Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3424.pdf Registros recuperados: 5 Primeira ... 1 ... Última

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