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Numerical simulation and experimental validation for energy harvesting of single-cylinder VIVACE converter with passive turbulence control

2015; Elsevier BV; Volume: 85; Linguagem: Inglês

10.1016/j.renene.2015.07.088

1879-0682

Lin Ding, Li Zhang, Michael M. Bernitsas, Che-Chun Chang,

Innovative Energy Harvesting Technologies

Flow Induced Motions (FIM) of a single, rigid, circular cylinder on end-springs are investigated for Reynolds number 30,000 < Re < 110,000. Passive Turbulence Control (PTC) in the form of roughness strips is applied to enhance FIM and increase the efficiency of the VIVACE (Vortex Induced Vibration for Aquatic Clean Energy) converter in harnessing marine hydrokinetic energy. Numerical simulations are performed using a solver for two-dimensional Unsteady Reynolds-Averaged Navier-Stokes equations, which is developed based on OpenFOAM using a finite-volume discretization method. The results are in excellent agreement with experiments conducted in the Marine Renewable Energy Laboratory (MRELab) at the University of Michigan. Amplitude and frequency are predicted correctly in the initial and upper VIV branches, in VIV-to-galloping transition, and in galloping. The 2S (S = Single) vortex pattern is observed in the initial VIV branch and the 2P + 2S (P = Pair) in the upper branch for 30,000 ≤ Re ≤ 80,000. Transition from VIV to galloping initiates at Re = 90,000 with a P + 2S + P + S pattern. Maximum amplitude of 3.5 D ( D = Diameters) is achieved and more than seven vortices per cycle are observed in fully developed galloping. With PTC, the VIVACE converter can harness hydrokinetic energy from currents or tides over the entire range of FIM synchronization . Energy conversion efficiency reaches 37% in simulations and 28% in experiments. • Passive Turbulence Control is applied to enhance FIM of a circular cylinder for energy harnessing using the VIVACE converter. • Simulations predict well vibrating response as well as VIV branches, transition from VIV to galloping, and galloping. • Vortex structures of a cylinder in VIV and galloping are predicted accurately. • Hydrokinetic energy can be harnessed by the VIVACE converter for 30,000 < Re < 110,000. • Energy conversion efficiency reaches 37% in simulations and 28% in experiments at different operating points.