Numerical simulation method for high-density cultured fish schools in deep sea net cages

Abstract

The invention discloses a numerical simulation method for high-density cultured fish schools in deep sea net cages, and the method comprises the steps: adopting a rigid body fish model to simulate cultured fish schools, wherein a rigid body fish comprises a fish body and a fish tail; applying a drag force and a lift force respectively to the fish body and the fish tail to simulate the influence ofhigh-density fish schools on flow fields and deformation around the net cages; adopting a k-omegaSST turbulence model to simulate flow fields around the net cage and the high-density cultured fish schools, adopting a nonlinear structure finite element model to calculate structural deformation of the net cage, and finally achieving the numerical simulation of the influence of the high-density cultured fish schools on the flow fields around the net cage and deformation. By adopting the method, the flow field and structural deformation around the net cage under different cultured fish swarm distribution modes, culture densities, swimming speeds and accelerations can be calculated. The model solves the problem of numerical simulation of high-density cultured fish schools in the deep sea net cage, can be well used for dynamic response analysis of the actual net cage, and provides support for structural design of the deep sea net cage.

Description

Technical field [0001] The invention belongs to the technical field of marine engineering and aquaculture engineering, and particularly relates to a three-dimensional numerical simulation method for the impact of high-density aquaculture fish schools inside a cage culture facility under the action of waves and currents on water flow. Background technique [0002] As marine aquaculture moves from near shore to deep water, large-scale cages are the future development trend of marine aquaculture. The use of cages for aquaculture is a high-density and intensive aquaculture method. The activities of high-density fish farming inside the cages will have a significant impact on the flow field around the cages, and will inevitably also affect the cages. The load and structural deformation of the cage; the use of numerical simulation to study the influence mechanism of the fish school on the flow field around the cage and the load on it is the key to establishing a refined model of the dyn...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic and foreign numerical simulation studies on the dynamic response of cages under the action of waves and currents have not considered the impact of high-density cultured fish on the internal flow field and deformation of the cage, which will affect the internal flow field and structural deformation of the cage accurate calculation of

The traditional numerical model of fish swimming uses computational fluid dynamics to simulate fish swimming, but this type of method requires a large number of fine grids when simulating high-density fish farming , will seriously affect the calculation efficiency, making the calculation impossible

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