Frequency Selection and Phase Locking during Aeroelastic Galloping

Justin S. Leontini (1) , Jisheng Zhao (2) , Hewawasam Gamage Kasun Gayantha Jayatunga (3) , David Lo Jacono (4) , Boon Thong Tan (3) , John Sheridan (2)

1 Swinburne University of Technology [Melbourne]
2 Fluids Laboratory for Aeronautical and Industrial Research - FLAIR (Victoria, Australia)
3 Monash University [Malaysia]
4 IMFT - Institut de mécanique des fluides de Toulouse

This paper presents an analysis of the aeroelastic galloping of an elastically mounted square cross section in a free stream. The classic quasi-steady model [1] is used as a starting point. From this, the relevant time scales and dimensionless groups of the problem are derived. The time scale analysis shows that the mechanism of frequency selection by the oscillating system changes for heavy and light bodies. Results from direct numerical simulations are presented and compared against results from the simplified quasi-steady model, showing that the quasi-steady is quantitatively valid for heavy bodies, and at least generally qualitatively valid for light bodies. Results of experiments on light bodies also show this general qualitative agreement. However, there are also regimes of nonlinear interaction between the galloping and vortex shedding that the simplified model cannot capture.

Mots clés: Fluid-structure interactions; Galloping

Domaines: Mécanique des fluides [physics.class-ph]

Justin S. Leontini, Jisheng Zhao, Hewawasam Gamage Kasun Gayantha Jayatunga, David Lo Jacono, Boon Thong Tan, et al.. Frequency Selection and Phase Locking during Aeroelastic Galloping. 19th Australasian Fluid Mechanics Conference, Dec 2014, Melbourne, Australia. pp. 1-4. ⟨hal-01774974⟩