Experimental and numerical investigation of hydrodynamics around towed fishing gear

Karen B. Burgaard*, Stefan Carstensen, David R. Fuhrman, F. G. O'Neill

*Corresponding author for this work

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

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Abstract

Towed fishing gears are responsible for a large portion of global landed catch. However, little is known about the hydrodynamics around these gears, even though it is likely to have a large impact on both catch efficiency and selectivity of fish type. An experimental investigation has been carried out in a current flume within the DTU Civil and Mechanical Engineering Hydraulics Laboratory, measuring flow velocities with Laser Doppler Velocimetry around a model of the ground gear of a standard fishing gear. The experimental data is used to validate a CFD model in OpenFOAM using the k-ω [1] turbulence model. Instantaneous flow velocities are obtained in the flume from which the turbulent fluctuations are determined through Reynolds averaging. The three dimensional CFD model provides promising results where both the turbulent kinetic energy and velocity field are well predicted. The CFD model will be used with the intent to improve the starfish fisheries in Limfjorden. The density and settling velocity of starfish are measured and the results from the CFD model will be combined with a particle path model (Figure 1) to provide an initial estimate of how the hydrodynamics around the groundgear affect the starfish dynamics. Sea trials are conducted to investigate how changes to the groundgear design alter the hydrodynamics and hence the reaction and capture of starfish.
Original languageEnglish
Publication date2022
Number of pages1
Publication statusPublished - 2022
Event1st Marine Computational Fluid Dynamics Seminar - Stavanger, Norway
Duration: 5 May 20226 May 2022

Conference

Conference1st Marine Computational Fluid Dynamics Seminar
Country/TerritoryNorway
CityStavanger
Period05/05/202206/05/2022

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