Energy-harvesting from flow-induced vibration of circular and elliptical cylinders

Abstract eng:
A parameter space study is presented of the flow past an elastically-mounted cylinder constrained to oscillate in the cross-stream direction, where the cylinder is also forced to rotationally oscillate. The focus is on enhancing the cross-stream heaving response with the intent of harvesting energy. Linear damping is applied to the heave to simulate power extraction. The variation of power output with damping coefficient and geometry is investigated, with circular, elliptical and aerofoil cross-sections tested. Of interest is the variation of the flow and configuration parameters for the optimal case for each geometry. For these optimal cases, an increase in power output, cylinder displacement and wake width is observed with increasing cross-section aspect ratio, while a roughly constant driving frequency of 0.180 is observed for aspect ratios greater than 1.0.

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