An Improved Co-Rotational Algorithm for Nonlinear Aeroelasticity Solution
Computational structural dynamics (CSD) and Computational fluid dynamics (CFD) referring to aeroelasticity are highly nonlinear problems in time domain. Euler equation is solved by finite volume method with dual-time technology to obtain nonlinear unsteady aerodynamic load; the finite element co-rotational theory is applied to model geometric nonlinear structure, and an approximate energy conservation algorithm is developed to achieve nonlinear dynamic response; combined with interface technique, which involves conservation volume transformation and second order time loosely coupled algorithm, an improved CFD/CSD coupled system is designed to solver nonlinear aeroelasticity, Then, the developed algorithm is performed on aeroelastic response of NACA 0012 airfoil, the results illustrate that the improved algorithm has superior accuracy and efficiency compared with conventional method.