Three-dimensional numerical simulation method for influence of flexible net on water flow

Abstract

The invention discloses a three-dimensional numerical simulation method for influence of a flexible net on water flow. The method comprises the deformation calculation of the net and the calculation of a flow field at the periphery of the net. The calculation of the flow field at the periphery of the net comprises the following steps of: determining a control equation, calculating a porous mediumcoefficient, dividing boundary conditions and grids, and calculating numerical values. In the method, the deformation of the net in the water flow is simulated by a concentrated mass method, and a three-dimensional flow field at the periphery of the net is simulated by a Realizable k-epsilon turbulence model and a porous medium model; by the method, the deformation of the net under the action of the water flow and the three-dimensional flow field at the periphery of the net can be acquired at the same time, and the problems that the conventional calculation and measurement of the flow field at the periphery of the net is high in cost and time consumption and a three-dimensional integral flow field cannot be provided are solved; and physical experiments prove that a flow field result acquired through numerical simulation accords with an actual result (the maximal relative error is less than 5 percent), and the calculating time of the numerical simulation is less than 5 hours.

Description

technical field [0001] The invention belongs to the technical fields of aquaculture engineering, water conservancy engineering and marine engineering, and in particular relates to a three-dimensional numerical simulation method for the influence of flexible netting on water flow during the action of water flow. Background technique [0002] In the process of deep-water cage culture, the flow of water in the cage is closely related to the growth of fish. The flow velocity of the water in the cage determines the exchange speed of the water inside the cage, which has a significant impact on the water quality and environment in the cage. Therefore, the flow reduction effect of the net has attracted much attention; in the force calculation of the net, the flow reduction effect of the net is also the same. It has attracted attention, and many studies have shown that the force of the net is generally proportional to the square of the flow velocity. Even if there is a small differen...

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Problems solved by technology

Since the net is a special marine engineering structure, it is completely different from the marine structures usually used in ports, offshore oil fields, etc., and has the characteristics of large deformation, flexibility, and porosity. The cost of physical model test simulation is high and time-consuming. Due to the limitation of observation technology, it is difficult to give the overall flow field near the whole watershed of Wangyi

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