Navigating the future of flow-induced vibration-based piezoelectric energy harvesting

Renewable and Sustainable Energy Reviews, Journal Year: 2024, Volume and Issue: 201, P. 114624 - 114624

Published: June 10, 2024

Language: Английский

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Flow-induced vibration of two tandem square cylinders at low Reynolds number: transitions among vortex-induced vibration, biased oscillation and galloping

Journal of Fluid Mechanics, Journal Year: 2024, Volume and Issue: 986

Published: April 30, 2024

The flow-induced vibrations (FIVs) of two identical tandem square cylinders with mass ratio m * = 3.5 at Reynolds number Re 150 are investigated through two-dimensional direct numerical simulation (DNS) and linear stability analysis over a parameter range spacing 1.5 ≤ L 5 reduced velocity 3 U r 34. Three kinds FIV responses, namely vortex-induced vibration (VIV), biased oscillation (BO) galloping (GA), identified. FIVs then further classified into the branches initial VIV (IV), resonant (RV RV′), flutter-induced (FV), desynchronized (DV), developing from GA (GV), transitional state between (TR), BO based on characteristics responses. transitions among different examined by combining DNS analysis, where transition boundaries VIV, concerned parameters identified branch maps. IV to RV or RV′ is found be related unstable wake mode, while FV, transiting RV′, induced structural factor in wake-structure mode. instability considered as physical origin GA, whereas mode competition structure leads DV, GV TR, thus delays appearance GA. DV equilibrium position, accompanied even-order harmonic frequencies, essentially symmetry breaking bifurcation.

Language: Английский

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Wake-induced vibration of ultra-long suspenders adjacent to bridge tower

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(10)

Published: Oct. 1, 2024

The tower wake usually induces large-amplitude vibrations in adjacent suspenders of a long-span suspension bridge. In order to interpret the underlying mechanism significant wake-induced ultra-long suspenders, vibration characteristics tandem beside bridge are investigated using computational fluid dynamics based simulation. First, model and is established. Subsequently, effect on suspender analyzed considering inflow velocity relative position between suspenders. Based proper orthogonal decomposition (POD), flow behind around investigated, governing revealed ultimately. results indicate that exhibits lock-in phenomenon with large cross-wind amplitudes at specific incoming wind velocities. loads both along-wind directions exhibit components frequencies multiples vortex shedding frequency. field can be accurately constructed first four POD modes largest energy. symmetric primary contribute

Language: Английский

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Investigation of flow-induced vibration and energy extraction of a bluff body with different immersed depths and cross section shapes

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(9)

Published: Sept. 1, 2024

This paper investigated the effects of immersed depth and cross section shape on flow-induced vibration (FIV) response power harvesting performance by experiment numerical simulation. The was carried out in a recirculating water channel. Three shapes were considered: circular, square, equilateral triangle. reduced velocity spans from 3 to 15. range ratio H* = Hi/D is 2 8, where Hi depth, D reference length cylinders, case 8 fully water. results show that vortex-induced crossflow direction circular cylinder observed when reaches ≥ 6. Out cylinders examined, triangular exhibits strongest amplitude response. maximum cylinder, reaching 2.38D, obtained at U* energy output FIV system most superior utilizing cylinders. Importantly, completely surpasses 10, it has capability produce an exceeds 1200 μW.

Language: Английский

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Characterizing vibrations and associated wake structures of tandem square cylinders at different angles of incidence

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(4)

Published: April 1, 2024

Finite element computations were conducted to investigate the transverse vibrations of three identical tandem square cylinders and associated wake patterns at a Reynolds number Re = 150. The reduced velocities ranged from U*=3 20, angles incidence set α=0°, 22.5°, 45°. streamwise gaps for these α Lx=5H, 3.8H, 3.5H, respectively, where H represents projected dimension cylinder normal freestream. mass ratio was fixed m*=2, damping neglected allow attain maximum amplitudes. In presence primary vortices being shed all cylinders, upstream α=22.5° 45° exhibits distinct vibration regimes: initial excitation upper lower response regions. On other hand, due interaction with vortices, two downstream display four case dynamic appears in only regimes, but higher peak amplitude compared Vibration shedding frequencies closely synchronize natural frequency spring-mass system second regime, leading high oscillations most third regime is lock-in phenomenon. α=0° 22.5° configurations, mode 2S while α=45°, shifts P + S during regime. Up lift vortex forces are in-phase cylinder's oscillation they go out phase beyond that. although remains displacement force found be phase. This study expected enhance understanding fluid–structure phenomena involved multiple structures can aid design stable civil engineering, offshore development energy harvesting devices.

Language: Английский

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Predicting flow-induced vibrations of tandem square cylinders using finite element simulations and data-driven neural network model

Ocean Engineering, Journal Year: 2024, Volume and Issue: 308, P. 118237 - 118237

Published: May 29, 2024

Language: Английский

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Aerodynamic force characteristics and flow field mechanism of multiple square cylinders in a tandem arrangement

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)

Published: July 1, 2024

Wind tunnel tests and large eddy simulations were employed to obtain the aerodynamic coefficients flow fields of two three tandem square cylinders across various spacing ratios. The ratio L/D, defined as center-to-center between adjacent their width, ranges from 1.2 8. By analyzing these results, force characteristics generation mechanism at a high Reynolds number (Re = 3.2 × 104) revealed. comparing results cylinders, effect adding third cylinder behind on its was clarified. show that unlike exhibit critical ratios, (L/D)cr1 2.5–3 (L/D)cr2 3.5–4, respectively. Based around is identified single blunt body, reattachment, co-shedding regimes. In body reattachment regimes, addition significantly alters leading reduced mean drag coefficients, fluctuating lift Strouhal numbers, along with an increased ratio. regime, this has little flow.

Language: Английский

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Suppression of Vortex-Induced Vibration Caused by A Terebridae-Inspired Cylinder with Different Helical Angles

China Ocean Engineering, Journal Year: 2024, Volume and Issue: 38(5), P. 739 - 754

Published: Oct. 1, 2024

Language: Английский

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