Numéro : 2263 - Year : 1995

Numerical and experimental study of the water flow in trawls. (Water flows bounded by a porous and axisymetric surface)

B. VINCENT, IFREMER -Lorient
D. MARlCHAL, Ecole Centrale de Nantes

This work fits into a global improvement project of fishing gears selectivity like trawls. The selectivity of a fishing gear is its capacity to leave young fishes escape through meshes. Our goal is to improve our knowledge about meshes geometry in codend where selectivity especially works. To be able to calculate meshes geometry we need to know water speed in the trawl. Indeed, meshes geometry depends on hydrodynamic forces due to the flow. The study is restricted to codend where variations of water speed are more important. We use the Navier-Stoke equations to solve the problem. These equations are not solved around each wire of codend, because it is technically impossible. Then codend is supposed to be an homogeneous and porous surface. We add to these equations a turbulent model based on a mixing length. At last, we compare numerical results and a first serial of experiences made in a flum tank.

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