Objective
The aim of this project is to develop a computer assisted simulation software which will allow calculation of the shape, drag and twine tension of a trawl in fishing situations, with its warps, doors and complete rigging. The netmaker will thus have a powerful tool to design the best trawl adapted to a given fishery avoiding making too many model tests in a flume tank and the costly trial and error process.
Another use of this software will be decision making assistance to trawler skippers at sea, as soon as it is possible to organize the program to have it run on an onboard microcomputer. It would help the skipper to decide what rigging, towing speed, warp length, and type of doors he may use to fish exactly what he wants to catch.
The research work comprises the following main phases.
Phase 1 is the generalization of an existing computer program, calculating the shape of a pelagic trawl on which are applied hydrodynamic and weight forces by introducing warps, doors and other pieces of gear and rigging (even captured fish) in the study of the equilibrium configuration of the whole fishing gear. .SP 1 Phase 2 will allow the 3 partners to get accurate knowledge of hydrodynamic coefficients to be used in computer simulation, experimental control of calculation results, and determination of an empirical method to simplify the mesh by mesh description of the trawl. This experimental phase includes:
accurate measurement of the filtration of water through a net, including 3-dimensional water velocity measurements in different sections of a large model of the central part of a pelagic trawl;
drag measurements on different mesh sizes, pieces of netting at different angles of attack and different openings of the meshes;
and drag measurements and shape determination of 3 different models of pelagic and ground trawls, scaled down in different ratios and built with different mesh numbers and twine diameters, and comparison with calculated drags and shapes.
Phase 3 is the adaptation of computer assisted drafting systems to create the data files to be entered in the computer assisted design program.
Phase 4 is the integration of the different results in a complete shape and drag calculation modular program adapted to ground and pelagic trawls, including the best available data for calculating the hydrodynamic forces applied to the twine and rigging, introducing the shear forces on the bottom, the whole gear description and the interface with drafting system (CADTRAWL or PLANCHALUT).
Phase 5 is the acceleration of the interactive calculation of shape and tensions when equilibrium is reached by one of the following means:
simplifying the mesh by mesh desh description, using a mathematical and physical process;
using, for the first steps of the interactive process, simplifications and approximations used for trawl model making (bigger meshes, fewer meshes, bigger twine);
and making the program run on a parallel computer.
Phase 6 is writing a demonstration program allowing accurate prediction of what will be an interactive computer assisted design program and looking for the best means to make an adapted program available for use on an onboard microcomputer.
Phase 7 is the project coordination.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- agricultural sciences agriculture, forestry, and fisheries fisheries
- natural sciences computer and information sciences software software applications simulation software
- natural sciences mathematics applied mathematics mathematical model
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Programme(s)
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Coordinator
29280 PLOUZANE
France
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