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| Numerical simulation of fluid-solid rotating motion of rigid elliptic cylinder |
| LI Tao, WANG Yuchuan, KANG Yang*, ZHAO Congcong, SONG Xiaoqian |
| College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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Abstract Two-way fluid-solid interaction of the fixed-axis auto-rotation of rigid elliptic cylinder was simulated numerically using a coupled computational fluid dynamics(CFD)—rigid body dynamics(RBD)model. By solving two-dimensional unsteady incompressible N-S equations and SST k-ω turbulent governing equations, wake flow features and motion characteristics of elliptic cylinder were investigated in different axis ratios, eccentric distance ratios and Reynolds number conditions. Accor-ding to the simulated results, swing angle θ of the elliptic cylinder increases with axis ratios and Reynolds number increasing. In addition, with the eccentric distance ratios increasing, swing angle θ of the elliptic cylinder first increases and then decreases. A linear growth relationship can be observed between the swing frequency of the elliptic cylinder and Reynolds numbers, while axis ratios and eccentric distance ratios illustrate insignificant influence on the swing frequency of the elliptic cylinder. Wake evolution behind the cylinder and variations of instantaneous pressure coefficients were analyzed in order to reveal the mechanism of swing motion of eccentric elliptic cylinder. The results provided fundamental support for the utilization of ocean current energy.
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Received: 05 July 2017
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