Numerical and experimental study of submerged supple nets: Applications to fish farms |
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Authors: | Fabien Le Bris Dominique Marichal |
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Institution: | (1) Laboratoire de Mécanique des Fluides UMR CNRS 6598, Division Hydrodynamique Navale, Ecole Centrale de Nantes, BP 92101-44321, Nantes, Cedex 3, France |
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Abstract: | Our aim is to investigate the behavior of submerged supple nets. This work generates many problems owing to the discontinuous
and highly flexible nature of the nets. Only the action of external forces can bring an infinitely flexible structure like
a net into a definite shape. When considering supple nets immersed in a fluid, these external forces themselves depend on
the net geometry. A numerical method to solve this fluid-structure coupling problem is proposed, and is applied to fish farms.
In order to validate the calculation model of the hydrodynamic forces on the mesh sides, we measured the hydrodynamic forces
on a plane panel of netting spread across a transverse current. We thus proved that the Landweber model modified according
to the Richtmeyer formula as regards friction gives good results. The calculated shape of the fixed net cage is qualitatively
in accordance with flume tank observations. We have adapted the algorithm to the study of the dynamic behavior of floating
fish farms. |
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Keywords: | supple net fluid-structure coupling problem fish farm aquaculture plane panel of netting |
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