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Aeroelastic prediction of the limit cycle oscillations of a cropped delta wing
Institution:1. Department of Mechanical & Aerospace Engineering, Naval Postgraduate School, Monterey, CA 93943, USA;2. Department of Mechanical Engineering, US Naval Academy, Annapolis, MD 21402, USA;1. Department of Civil & Railroad Engineering, Daewon University College, 599 Shinwol, Jecheon 390-702, Republic of Korea;2. Division of Construction and Environmental Engineering, Kongju National University, 275 Budai, Cheonan 330-717, Republic of Korea;3. Department of Civil Engineering, Gangneung-Wonju National University, 7 Jukheon, Gangneung 210-702, Republic of Korea;1. Department of Biomedical Engineering, University of Baghdad, Baghdad, Iraq;2. Duke University, Durham, NC, United States;3. Department of Mechanical Engineering, University of Baghdad, Baghdad, Iraq
Abstract:The flutter and limit cycle oscillation (LCO) behavior of a cropped delta wing are investigated using a newly developed computational aeroelastic solver. This computational model includes a well-validated Euler finite difference solver coupled to a high-fidelity finite element structural solver. The nonlinear structural model includes geometric nonlinearities which are modelled using a co-rotational formulation. The LCOs of the cropped delta wing are computed and the results are compared to previous computations and to experiment. Over the range of dynamic pressures for which experimental results are reported, the LCO magnitudes computed using the current model are comparable to those from a previous computation which used a lower-order von Karman structural model. However, for larger dynamic pressures, the current computational model and the model which used the von Karman theory start to differ significantly, with the current model predicting larger deflections for a given dynamic pressure. This results in a LCO curve which is in better qualitative agreement with experiment. Flow features which were present in the previous computational model such as a leading edge vortex and a shock wave are enhanced in the current model due to the prediction of larger deflections and rotations at the higher dynamic pressures.
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