scholarly journals Hydrokinetic energy conversion using compliant surfaces

2019 ◽  
Vol 43 (9) ◽  
pp. 4427-4435
Author(s):  
Francisco J. Arias ◽  
Salvador De Las Heras
Keyword(s):  
Energy Conversion ◽  
Hydrokinetic Energy ◽  
Compliant Surfaces

scholarly journals Influence of attack angle on vortex-induced vibration and energy harvesting of two cylinders in side-by-side arrangement

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401882259
Author(s):  
Li Zhang ◽  
Xinru Mao ◽  
Lin Ding
Keyword(s):  
Energy Harvesting ◽  
Energy Conversion ◽  
Energy Conversion Efficiency ◽  
Maximum Energy ◽  
Attack Angle ◽  
Navier Stokes ◽  
Vortex Induced Vibration ◽  
Hydrokinetic Energy ◽  
Wake Patterns ◽  
Vibration Responses

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°.

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