Vortex-induced vibration is a fluid instability where vortices due to secondary flows exert a periodic unsteady force on the elastic structure. Under certain circumstances, the shedding frequency can lock into the structure natural frequency and lead to limit cycle oscillations. These vibrations may cause material fatigue and are a common source of structural failure. This work uses a frequency domain, harmonic balance (HB) computational fluid dynamics (CFD) code to predict the natural shedding frequency and lock-in region of an airfoil at very high angles of attack. The numerical results are then successfully compared to experimental data from wind tunnel testings.
Vortex-Induced Vibration and Frequency Lock-In of an Airfoil at High Angles of Attack
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 16, 2015; final manuscript received July 18, 2015; published online August 21, 2015. Assoc. Editor: Sharath S. Girimaji.
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Besem, F. M., Kamrass, J. D., Thomas, J. P., Tang, D., and Kielb, R. E. (August 21, 2015). "Vortex-Induced Vibration and Frequency Lock-In of an Airfoil at High Angles of Attack." ASME. J. Fluids Eng. January 2016; 138(1): 011204. https://doi.org/10.1115/1.4031134
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