Energy transformation on flow-induced motions of multiple cylindrical structures with various corner shapes

This paper proposes a novel design for a flow-induced vibration-based energy harvester, consisting of an elastic L-shaped beam, with an inherent nonlinearity in its structural stiffness as an alternative to the classical cantilever beam used in conventional fluidic energy harvester designs. The L-shaped beam supports a prism at its tip and undergoes large-amplitude galloping oscillations. The results from wind tunnel experiments show that by replacing a conventional linear structure that supports the prism with a nonlinear one, the high frequency flow components, shed from the tip prism, were capable of exciting the oscillations of the structure at higher harmonics of the main resonance, thus enhancing the power density of the energy harvester. As a result of improved power density values, the proposed harvester design holds great potential to be used as advanced space-efficient energy harvesters.

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Numerical analysis of the wake dynamics of a propeller

Wang

Gong

et al. 2021

Physics of Fluids

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This paper investigates the inception mechanism of propeller wake instability based on an improved detached eddy simulation method at a moderate advance coefficient of J = 0.65. Computational fluid dynamics simulations involving a rotating propeller using a dynamic overset technique are performed at J = 0.38 and J = 0.88 to validate the numerical approach, and these results are compared against experimental data of thrust and torque coefficients and phase-averaged axial velocity from the literature. The results indicate that propeller wake instability results from interactions among vortex structures behind the propeller and the high-speed shear layer. In addition, the diffusion of azimuthal velocity plays an important role in the mutual induction process. Finally, we propose a model that includes the main physical processes leading to tip vortex instability and can predict the time and location of vortex pairing. The present study provides deeper insight into the flow physics driving the tip vortex pairing process.

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Energy transformation on flow-induced motions of multiple cylindrical structures with various corner shapes

Cited by 8 publications

References 30 publications

Numerical investigation on the effects of current headings on vortex induced motions of a semi-submersible

Numerical investigation on the effects of current headings on vortex induced motions of a semi-submersible

Flow-induced vibration of inherently nonlinear structures with applications in energy harvesting

Numerical analysis of the wake dynamics of a propeller

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