DYNAMIC ANALYSIS OF AEROELASTIC RESPONSE FOR TRANSONIC FLOW WITH NONLINEAR STRUCTURAL MODEL

摘要

The present paper is concerned with dynamic analysis of time marching aeroelastic responses of typical sections in transonic flow with nonlinear strucutral models. An aeroelastic model is proposed in which the concentrated nonlinear-ities can be described by continuous functions, namely using hyperbolic tangent and polynomial functions. Typical free-play described by continuous functions is also adopted. Major interest is in verifying how the degree of the structural nonlinearity affects the transonic aeroelastic behavior. An Euler CFD code based on the finite volume discretization for unstructured grids is used for the unsteady aerodynamic loading assessment. The results shown in the paper are particularly concerned with the investigation of nonlinear effects for transonic flow over a NACA 0012 airfoil-based typical section. The investigation considers both time histories of the aeroelastic response as well as phase plane analyses.