This work proposes a novel approach to compute transonic limit-cycle oscillations using high-fidelity analysis. Computational-Fluid-Dynamics based harmonic balance methods have proven to be efficient tools to predict periodic phenomena. This paper's contribution is to present a new methodology to determine the unknown frequency of oscillations, enabling harmonic balance methods to accurately capture limit-cycle oscillations; this is achieved by defining a frequency-updating procedure based on a coupled computational-fluid-dynamics/computational-structural-dynamics harmonic balance formulation to find the limit-cycle oscillation condition. A pitch/plunge airfoil and delta wing aerodynamic and respective linear structural models are used to validate the new method against conventional time-domain simulations. Results show consistent agreement between the proposed and time-marching methods for both limit-cycle oscillation amplitude and frequency while producing at least a one-order-of-magnitude reduction in computational time. Presented as Paper 2014-2310 at the 44th AIAA Fluid Dynamics Conference, Atlanta, GA, 16-20 June 2014
Prediction of Transonic Limit-Cycle Oscillations Using an Aeroelastic Harmonic Balance Method
AIAA journal ; 53 , 7
2015
Article (Journal)
English
Prediction of Transonic Limit Cycle Oscillations using an Aeroelastic Harmonic Balance Method
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