The behavior of the separated shear layers and the near wake of a circular cylinder with small-amplitude rotary oscillations (Ω1 = 0.05−0.15 for f f/f o ≤ 1.25) were investigated experimentally at Re = 3,700. Measurements of an unforced cylinder were also made for 2,000 ≤ Re ≤ 10,000 to better understand the effects of rotary oscillations. The results show that the shear-layer vortices formed closer to the cylinder and the distance separating them was found to decrease with cylinder oscillations. The shear-layer frequency, however, increased with increasing forcing frequency f f. The formation-region length l f decreased significantly with increasing f f while decreased to a lesser extent with increasing normalized oscillation amplitude Ω1. The shear layer also diffused to a length L d larger than that of an unforced cylinder, while the l f-L d-Strouhal frequency offsetting mechanism was generally maintained. The near wake was of lower momentum compared to an unforced cylinder, and the transverse velocity fluctuations associated with the unforced vortex-shedding frequency f o always presented a local peak at f f/f o = 0.5, regardless of Ω1 tested.
Experiments in Fluids – Springer Journals
Published: Jun 27, 2007
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