An aeroelastic model for vortex-induced vibrating cylinders subject to frequency lock-in

作者：Besem Fanny M^*; Thomas Jeffrey P; Kielb Robert E; Dowell Earl H

来源：Journal of Fluids and Structures, 2016, 61: 42-59.

DOI：10.1016/j.jfluidstructs.2015.10.009

• Vortex-induced vibration
• Frequency lock-in
• Aeroelastic model
• Harmonic balance

This work presents a novel way to calculate the response amplitude of an elastically supported cylinder experiencing vortex-induced vibrations. The method couples a computational fluid dynamic (CFD) model of the shedding vortex flow to a structural model representation of the elastically supported cylinder. The aerodynamic forces on the cylinder are calculated using a harmonic balance, frequency domain solver. Three cases are considered: the cylinder vibrating transverse to the flow, in-line with the flow, and with both degrees of freedom. Two shedding patterns are observed, symmetric and antisymmetric, depending on the lock-in region considered. The in-line degree of freedom does not have a significant effect on the cylinder cross-flow response, except for very low mass or very low damping.

• 出版日期2016-2