Influence of turbulence intensity on vortex pattern for a rigid cylinder with turbulence stimulation in flow induced oscillations

The effect of ambient turbulence intensity on the flow induced oscillations rigid circular cylinders with symmetric and asymmetric local stimulation is studied. Cylinders oscillate in one degree freedom transversely to a steady uniform flow. Two-dimensional unsteady Reynolds-Average Navier-Stokes equations Spalart-Allmaras model are used solve problem numerically. Three freestream values (0.2%, 1%, 5%) study influence vortex pattern. Simulation results compared experimental data measured Marine Renewable Energy Laboratory University Michigan range 30,000 ≤ Re 110,000. amplitude ratio, lift coefficient, modes, interactions between vortices observed discussed. Major conclusions are: (a) Vortex patterns strongly depend intensity. (b) Low can generate multi-vortex at high Re. (c) High fewer separations shed into multiple inducing emergence elongated patterns.