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

A technology of vibration characteristics and prediction methods, which is applied in the field of biomechanics and its system coupling simulation, can solve problems such as grid deformity and discrete grid non-conservation, and achieve the effects of ensuring energy conservation, wide application fields, and strong adaptability

Inactive Publication Date: 2014-06-11
KUNMING UNIV OF SCI & TECH
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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

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

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Embodiment approach 1

[0037] Implementation mode one: such as figure 1 As shown, the method for predicting the flow-induced vibration characteristics of a large deformation superelastic structure based on the immersion boundary method includes the following steps:

[0038] Step 1: Use the meshing module to divide the entire coupled system area composed of fluid and superelastic structure using Cartesian meshing under Euler description, and output the element coordinate information to the file fnode.txt; solid area under Lagrange description Use body-fit finite element meshing, and output the corresponding mesh node information file to snode.txt;

[0039] Step 2: Use the initial value calculation module, load the boundary conditions of fluid calculation, and treat the coupled system area composed of fluid and superelastic structure as the solution of a single flow field under Euler description, and obtain the coupled system area composed of fluid and superelastic structure The steady-state flow field...

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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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Application Information

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IPC IPC(8): G06F19/00
Inventor 王文全闫妍郝栋伟
Owner KUNMING UNIV OF SCI & TECH
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