Fluid-solid coupling simulation method for fish shoal movement in marine environment

Abstract

The invention discloses a fluid-solid coupling simulation method for fish shoal movement in a marine environment. The fluid-solid coupling simulation method can be used for solving the problems of movement of a large number of small-size fish shoals in a large-scale flow field and the influence of the large-size fish shoals on the flow field. A flow field is established by adopting finite elements, small solids in the flow field are regarded as a point with coordinate, speed and acceleration attributes, the acting force of the flow field on the solids is determined through adoption of a lumpedparameter method, and meanwhile, the force is fed back to the flow field to serve as the additional force of the finite elements where the solid points are located, so that fluid-solid coupling is realized. Aiming at the situation that the flow field area is far larger than the solid size, the solid modeling part in traditional fluid-solid coupling is avoided, meanwhile, dynamic response of fluid-solid coupling is achieved, and the calculated amount and the modeling difficulty are greatly reduced.

Description

technical field [0001] The invention belongs to the field of fluid analysis, and relates to flow field simulation and concentrated parameter method modeling, in particular to a fluid-solid coupling simulation method for fish school movement in a marine environment. Background technique [0002] Fluid-solid coupling mechanics is a branch of mechanics generated by the intersection of fluid mechanics and solid mechanics. It is a science that studies the interaction of various behaviors of deformed solids under the action of a flow field and the influence of solid configuration on the flow field. . The important feature of fluid-solid interaction mechanics is the interaction between two-phase media, and the deformed solid will deform or move under the action of fluid load. Deformation or movement affects fluid movement in turn, thereby changing the distribution and magnitude of fluid loads. It is this interaction that will produce various fluid-solid coupling phenomena under di...

AI Technical Summary

Problems solved by technology

[0004] Solids in the ocean, such as fish schools, are special in that their geometric size is negligible compared to the sea area to be studied, but their large number makes it impossible to ignore their influence on the flow field when calculating the flow field

[0005] The traditional moving boundary method treats such objects as porous and sparse media, but this method equates a large number of small objects to a solid with a specific shape, which limits the relative position of the solids to be close together and cannot change greatly. The sparsity coefficient cannot be changed and cannot reflect the actual situation

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