Vortex and Wake induced vibrations of circular cylinders: Overview of the phenomenon and 2D RANS simulations


Thursday, 28 April, 2016 - 10:00

Speakers: Riccardo Pigazzini and Simone Martini (University of Trieste - Department of Engineering and Architecture)

Room: SISSA - Santorio A - room 133

The seminar will present the problem of Vortex and Wake induced vibrations on circular cylinders (repsectively VIV and WIV). Given the broad range of industrial application of these phenomena, they have been an active research topic since the 70’s. The complexity of the system response, also in the case of steady and uniform inflow condition makes this apparently simple problem a very interesting research subject. The cases presented are representative of metal structures in water, where densities of the fluid and the structure are of the same order of magnitude. This particular situation enhances some of the peculiarities of single and twin cylinders amplitude response, namely “lock-in”, hysteresis and WIV. After a brief introduction of the problem physics, we presented a methodology for the numerical simulation of the flow past elastically mounted single and twin cylinders with 1-DoF. Simulations have been carried out using OpenFOAM, 2D URANS method and k-omega SST turbulence model. The quality of the results is evaluated through comparison with experimental data. The experimental cases of Khalak & Williamson (single cylinder) and Assi (two cylinders in tandem), were selected as benchmark.