Numerical simulation method of hydrodynamic force response of deep-sea culture net cage group

Abstract

The invention discloses a numerical simulation method of hydrodynamic force analysis of a deep-sea culture net cage group, comprising the following steps of: building a floating frame model; building a netting model; building an anchor line model; building a floating ball model; and solving by establishing a differential equation of motions. In the invention, a concentrated mass method and a rigid body kinematic theory are used for simulating the hydrodynamic force response of the deep-sea culture net cage group structure under the effects of waves; with the adoption of the method, anchor line tensions and floating frame motions of the deep-sea culture net cage group structure can be obtained; and according to the verification of physical experiments, the numerically simulated floating frame motions and anchor line tensions are matched with the actual floating frame motions and anchor line tensions. With the adoption of the method provided by the invention, the hydrodynamic force response of the net cage group composed of a plurality of the net cages can be analyzed and an anchor line system of a combined type net cage group can be optimized.

Description

technical field [0001] The invention belongs to the technical fields of aquaculture engineering, water conservancy engineering and ocean engineering, and in particular relates to a numerical simulation method for hydrodynamic response of a group of deep-sea aquaculture net cages under the action of marine environment loads. Background technique [0002] As early as the 1870s, China began to use cages for aquaculture activities; in the 1980s and 1990s, cage aquaculture developed rapidly. As of 2006, there were more than 1 million cages in the country, breeding more than 30 kinds of fish. In China, about 300,000 tons of fish are cultured in cages every year, and marine cages have become the pillar industry of aquaculture. However, most of the traditional cages in China are distributed near the shore, which will cause a series of problems: First, the traditional cages cannot resist the invasion of strong wind and waves, but they are distributed in the crowded near shore, and t...

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Problems solved by technology

However, most of the traditional cages in China are distributed near the shore, which will cause a series of problems: First, the traditional cages cannot resist the invasion of strong wind and waves, but they are distributed in the crowded near shore, and the density of near shore breeding exceeds the water environment The carrying limit of the fish will cause the pollution of the water body and the pollution of the net itself; secondly, most of the nearshore water bodies are polluted by industries on the coastline, which will lead to a decline in the quality of farmed fish, or even death, and reduce the breeding efficiency. thus restricting the development of aquaculture

Although deep-sea aquaculture cages have many advantages, they also face great challenges. The deep-sea marine environment is harsher than that of the near shore, and the net cages are subjected to greater loads from the marine environment. In order to design a suitable anchor rope system for deep-sea cages, it is necessary to Carry out research on the hydrodynamic characteristics of cages

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