轴向流中固支弹性薄板的大挠度流固耦合系统的数值模拟

就轴向流中两端固支大挠度弹性薄板的流固耦合振动特性,固支薄板的结构动力学方程用有限元法离散,流场采用不可压缩的二维粘性流体(N-S方程)用有限体积法离散,结合ADINA中的流体单元划分技术,建立了双向流固耦合作用下轴向流中两端固支薄板的二维仿真模型.通过模拟仿真分析研究了给定不同流速下固支板的流固耦合振动特征和大挠度系统的振动稳定性.分别得出了不同流速下固支板中点的挠度—流速曲线、挠度时程曲线及挠曲线图.结果表明:当流速小于固支板的临界流速时,板将处于稳定的直线平衡状态;当流速大于固支板的临界流速时,板将在新的位置达到弯曲平衡状态,以及在弯曲平衡位置附近发生极限环振动.

Fluid-Structure Interaction Simulation of Clamped Elastic Plate withLarge Deformation Subjected to Axial Flow

The dynamic reply and flow field features of fluid structure interaction system of large deformation clamped elastic thin plates suffered to axial flow are simulated numerically.The structural dynamics equation is dispersed by finite element method.The fluid region used an incompressible two-dimensional viscous fluid (Navier-Stokes equations),which is discretized by the finite volume method.A two-dimensional clamped simulation plate model in the axial flow with two-way fluid-structure interreaction is established,which is based upon the fluid element division technology in ADINA.Through the numerical simulation,it analyzed the fluid-structure interaction vibration characteristics and the stability of the large-deflection system of clamped plate with different flow velocities.The deflection velocity curve,deflection time-history curve and deflection curve have been obtained respectively.Results show that when the flow velocity is lower than the critical flow velocity,the plate will be in a stable linear balance;when the flow velocity is over the critical flow velocity,the plate will bend to a new position and the limit cycle vibration will occur near the new position of equilibrium.