Abstract
The number of good sites in less exposed locations for aquaculture farming is limited. Trends are now that the fish cages are increasing in both width and depth, as well as more weather-exposed locations, are taken into use. As the net cages continue to increase in size, so does the material costs. The design of the sea cages should be modified for safe and reliable use in remote offshore locations. Fish farms located in more exposed areas will be subject to more energetic waves and stronger currents, which will cause large net deformations. This is a challenge as fish welfare depends on a certain minimum volume within the net cage. Changing and maintaining net cages are some of the main expenses for fish farms. If the lifetime of the net cages is extended by introducing stronger, longer lasting materials, the overall costs of the nets will be reduced. The traditional nets are produced in nylon, while the promising solid PET-wire has been introduced to the aquaculture industry. In this paper, we introduce polyurethane to the aquaculture net cages, which will be studied together with nylon and PET-wire. The study is carried out using fluid-structure interaction (FSI) simulation, computational fluid dynamics (CFD) weakly coupled with structure mechanics (FEM). ANSYS® software is employed in the study. We will look at the materials that show the most promising results for aquaculture purposes.
Highlights
Aquaculture net cage may date back to as early as the 1200s in some areas of Asia and is currently a major form of aquaculture in countries including Canada, Chile, Japan, Norway and Scotland, where it has been used mainly for salmonid farming
Fish farms located in more exposed areas will be subject to more energetic waves and stronger currents, which will cause large net deformations
This is a challenge because fish welfare depends on a certain minimum volume within the net cage
Summary
Aquaculture net cage may date back to as early as the 1200s in some areas of Asia and is currently a major form of aquaculture in countries including Canada, Chile, Japan, Norway and Scotland, where it has been used mainly for salmonid farming. Fish farms located in more exposed areas will be subject to more energetic waves and stronger currents, which will cause large net deformations. This is a challenge because fish welfare depends on a certain minimum volume within the net cage. Modelling the hydrodynamic loads acting on a net cage is challenging due to hydroelasticity, i.e., fluid-structure interaction between moving sea-water and the flexible net [3]. This paper presents a study of aquaculture net cages made of Nylon PA6, PET-wire, and polyurethane using fluid structure interaction (FSI) simulations using ANSYS®. A piece of net is considered instead of a complete net cage
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