Transonic Aeroelastic Software and Its Engineering Application

Abstract

Due to the highly nonlinear characteristics of transonic flows, transonic aero elasticity cannot be predicted by the traditional linear flow solver coupled with the linear structure equation. Therefore, in the paper, a software package for the transonic aero elasticity with direct CFD/CSD coupling solution was developed. In this software, the flow fields are calculated in parallel by the unsteady Reynolds averaged Navier-Stokes equations. The structural deformations for flutter and static aeroelastcity are calculated with the generalized equation of structural motion and the structural static balance equation, respectively. Data transformations between the fluid and structure are interpolated by the radial basis function (RBF) and the principle of virtual work. Dynamic grid deformations are realized with the spring network method based on tetrahedral background grid. In order to improve computational efficiency of direct CFD/CSD coupling calculation, the reduced order models (ROM) of autoregressive moving average model (ARMA) is investigated and embeded in the software. In addition, static aeroelastic optimization based on the response surface model (RSM) is also studied and embeded in. Finally, some examples are presented for the validation of the implementation of the developed software.