Abstract
The vortex-induced vibration and energy harvesting of two cylinders in side-by-side arrangement with different attack angles are numerically investigated using two-dimensional unsteady Reynolds-Averaged Navier–Stokes simulations. The Reynolds number ranges from 1000 to 10,000, and the attack angle of free flow is varied from 0° to 90°. Results indicate that the vortex-induced vibration responses with attack angle range of 0°≤ α ≤ 30° are stronger than other attack angle cases. The parallel vortex streets are clearly observed with synchronized vortex shedding. Relatively large attack angle leads to a phase difference between the wake patterns of the two cylinders. Hydrokinetic energy can be obviously harvested when Re > 4000. Compared with the larger attack angle case, the two side-by-side cylinders with smaller attack angle have better performance on energy conversion. The maximum energy conversion efficiency of 21.7% is achieved. The optimum region for energy conversion is 5000 ≤ Re ≤ 7000 and 0°≤ α ≤ 30°.
Highlights
Vortex-induced vibration (VIV) is widely concerned with the rapid development of ocean engineering, wind engineering, aerospace, and nuclear engineering
The present study aims at analyzing the VIV responses of two side-by-side cylinders and achieving the best efficiency of energy conversion
The VIV of two rigid circular cylinders in side-by-side arrangement with different attack angles of flow is investigated using 2-D URANS simulations with the Spalart– Almaras (S-A) one-equation turbulence model
Summary
Vortex-induced vibration (VIV) is widely concerned with the rapid development of ocean engineering, wind engineering, aerospace, and nuclear engineering. As a common physical phenomenon, the flow past a bluff body and the oscillations induced by the vortex shedding have attracted a widespread attention during the past several decades, in theory and in the engineering applications of the hydrodynamics. Rich fundamental fluid mechanics have been revealed.[1,2,3,4] VIV is typically treated as a destructive phenomenon because the fatigue damage may be potentially introduced. Unlike previous efforts to alter vortex shedding and suppress the occurrence of VIV, Lee et al.[5] and Bernitsas et al.[6,7] have successfully utilized this potentially disastrous phenomenon to generate power with the VIVACE (Vortex-Induced Vibration for Aquatic Clean Energy) converter from ocean and river.
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