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Issue ESAIM: Proc.
Volume 22, 2008
CANUM 2006 - Congrès National d'Analyse Numérique
Page(s) 132 - 139
DOI http://dx.doi.org/10.1051/proc:072216
Published online 01 February 2008

ESAIM: Proc., 2008, Vol. 22, pp. 132-139
DOI: 10.1051/proc:072216

Proceedings in flow modelling in the surroundings of the end part of a trawl

Géraldine Pichot

IFREMER, Technopôle Brest-Iroise, BP 70, 29280 Plouzane Cedex et IRMAR, Campus de Beaulieu, 35042 Rennes Cedex, geraldine.pichot@ifremer.fr


(September, 2006 / Published online: 1 February 2008)

Abstract
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.


Résumé
Cet article présente les avancées concernant la modélisation et la simulation numérique de l'écoulement autour de la poche d'un chalut. Nous présentons tout d'abord la campagne expérimentale menée en Novembre 2004 au bassin d'essais de l'IFREMER de Boulogne-sur-Mer afin de collecter des données hydrodynamiques sur l'écoulement autour d'une poche de chalut rigide axisymétrique. Nous exposons dans une deuxième partie le modèle fluide utilisé, basé sur les équations de Navier-Stokes/Brinkman avec viscosité turbulente couplées à un modèle de turbulence à une équation. Enfin, nous testons la capacité du modèle à reproduire l'écoulement dans le cas simple de la maquette de Boulogne-sur-Mer par l'intermédiaire du code de calcul que nous avons écrit pour le logiciel Freefem++.


Mathematics Subject Classification. ???, ???

Key words: Fluids mechanics, Turbulence models, fishing nets


© EDP Sciences, ESAIM 2007


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