Numerical simulation of wing flutter based on multigrid method

Numerical simulation of aircraft's flutter is rather expensive and time-consuming. In order to save expense and calculating time, an efficient fluid-structure interaction solver based on multigrid is developed. The flow governing equations coupled with aeroelastic equations are solved using finite volume algorithm based on multigrid method. For the structural displacements a modal approach is applied. Radial basis function (RBF) method is used for data interaction between CFD and CSD. The system is marched implicitly in time domain using a dual time stepping method. The flutter speed boundary and flutter frequency boundary of Isogai wing model and Agard 445.6 wing are obtained by using above method. The results are in good agreement with related references, it is shown that the method based on multigrid method is effective for aeroelastic simulation.