Method for predicting flow-induced vibration characteristic of large-deformation super-elastic structure

Abstract

The invention provides a method for predicting the flow-induced vibration characteristic of a large-deformation super-elastic structure, and belongs to the technical field of biomechanics and system coupling simulation thereof. The structure and a surrounding flow field thereof are taken as a three-dimensional fluid-solid coupling system, and one set of coupled solution method based on an immersed boundary method is designed, so that the flow-induced vibration characteristic and unsteady flow field characteristic of the super-elastic structure are obtained. In the method, two sets of grids are adopted, an entire coupling system area consisting of fluid and the structure is solved by adopting a Cartesian grid under the description of Euler, and a solid area is solved by using an aptamer curvilinear grid under the description of Lagrange. In the method, a moving grid technology is not used, so that the problems of grid deformation, geometric non-conservation of discrete grids and the like are avoided, and the problem of mutual action of a large-deformation flexible structure and the fluid can be effectively solved. Particularly, the method can be widely applied to coupling motion of a flexible biological structure and the fluid.

Description

Technical field [0001] The invention relates to a method for predicting flow-induced vibration characteristics of a large-deformation superelastic structure, in particular to a flow-induced vibration prediction method for a superelastic structure in the field of biomechanics and its system, and belongs to the technical field of biomechanics and its system coupling simulation. Background technique [0002] One of the difficulties of the fluid-solid coupling problem is that fluids and solids use different mathematical description frameworks. Usually, fluid motion is described by Euler, while solid motion is described by Lagrange. The immersion boundary method provides a way to link these two frameworks together. The immersion boundary method models the elastic body immersed in the fluid into the physical force in the Navier-Stokes momentum equation, so that the entire physical area (fluid area and solid area) can be solved as a flow field. The immersed boundary method uses two se...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the traditional method for calculating the flow-induced vibration of hyperelastic structures, and propose a method for predicting the characteristics of flow-induced vibration of large-deformation hyperelastic structures, specifically a flow-induced vibration of large-deformation hyperelastic structures based on the immersed boundary method The characteristic prediction method, the flow field solution no longer uses the dynamic mesh technology, avoiding the problems of mesh deformation and discrete mesh geometry non-conservation, so that it can more effectively predict the flow-induced vibration behavior of large-deformation hyperelastic flexible structures

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