轴向流中平行简支弹性薄板的大挠度流固耦合的数值模拟

分析研究了轴向流中简支弹性薄板大挠度流固耦合系统的振动响应和流场特性.板结构动力学方程采用基于位移的有限元法离散;流场采用二维不可压缩粘性流体N-S方程,并用有限体积法离散;在此基础上结合动网格控制技术,建立模拟双向流固耦合作用下轴向流中简支弹性薄板的二维数值模型.利用该数值模型得到了单块简支板随流速变化流致振动特性,研究了结构大挠度的振动稳定性,分别得到了Pitchfork分岔曲线和非线性系统结构的Hopf分叉曲线.通过轴向流恒定流速下不同间距的平行两块简支弹性薄板流固耦合的数值模拟得到了的流致振动特性.

Fluid-structure Interaction Simulation of Simply Supported ParallelPlate with Large Deformation Subjected to Axial Flow

The dynamic response and flow field characteristics of fluid structure interaction system of simply-supported elastic thin plates with large deformation subjected to axial flow are studied numerically.The structural dynamics equation is discretized by displacement-based finite elements.The fluid domain is governed by two-dimensional incompressible viscous Navier-Stokes equations,which are discretized by the finite volume method.Based on this and combined with dynamic grid control technology,the two-dimensional numerical model of simply-supported elastic thin plate in the axial flow with two-way fluid-structure interaction is built.By using this numerical model,the flow-induced vibration characteristics of a single plate as well as the vibration stability of the large deflection structure are studied,Pitchfork bifurcation curve and Hopf bifurcation curve of nonlinear system structure have been obtained respectively.The flow vibration characteristics are gained through the numerical simulation of two simply supported parallel plate with different spacing and constant axial flow velocity.