一种在时域内计算三维翼颤振的方法

使用模态法构造结构模型,研究了在时域内耦合结构模型和气动模型预测三维翼颤振的方法;求解N-S方程计算非定常气动力.Newmark算法简化颤振方程.采用无限平面插值方法耦合结构网格和气动网格;使用弹性系数算法和局部网格重构法重构非结构气动网格,以确保结构方程和气动方程进行耦合求解.AGARD 445.6翼算例检验了计算方法的可行性.

Numerical Simulation of 3-D Wing Flutter in Time Domain

A numerical method coupling Navier-Stokes equations and structural modal equations for predicating Three-Dimensional transonic wing flutter was described and modal approach was used for predicting the structural response. The Newmark algorithm was used to solve flutter equation. Infinite-plate spline method transformed datum between structural grid and aerodynamic grid. Aerodynamic grid was deformed and regenerated based on spring-based smoothing method and local remeshing method. The flow and structural solvers were fully coupled within each physical time step. The computed flutter boundary of AGARD wing 445.6 for free stream Mach numbers ranging from 0.499 to 1.141 agreed well with the experiment.