Vortex-induced vibration of a flexibly-mounted cylinder placed in the proximity of a stationary parallel cylinder*

Some computational results on the vortex-induced vibrations (VIV) of a flexibly-mounted cylinder placed in the proximity of a stationary parallel cylinder will be presented. Simulations are performed at moderate Reynolds numbers (100<Re<1000), where VIV features of the non-stationary cylinder are examined for various gap sizes between the two cylinders and for different diameters of the stationary cylinder. An in-house fluid-structure interactions solver based on HORUS platform -- an open-source LES/DNS flow solver -- is used for simulations with two- and three-dimensional (2- and 3-D) cylinders. The results for 2-D cylinders of the same diameter at Re=150, the reduced velocity of 5 and for the centre-to-centre distance of 3.5D* (D* being the cylinder diameter) show a broken-symmetry vortex-shedding pattern behind the oscillating cylinder. This is caused by interactions between vortices shedding from the oscillating and stationary cylinders, as well as formation of a gap flow between them. Previous computational studies considered only 2-D cylinders and employed RANS flow solvers coupled with turbulence models.