Energy harvesting from wake-induced vibration of flexible flapper behind a bluff body DOI
Rajanya Chatterjee, Chhote Lal Shah, Sayan Gupta

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(11)

Published: Nov. 1, 2024

Piezoelectric energy harvesting from ambient vibrations offers a promising small-scale generation strategy, with wake-induced vibration of flexible structures being an ideal candidate. This study examines bluff body followed by fully piezoelectric flapper in viscous free-stream flow using in-house discrete forcing immersed boundary method-based fluid-structure-electric solver for parametric investigation. Different vortex shedding regimes are identified based on formation around the flapper. The complex and interdependent spatiotemporal dynamics wake dictated parameters such as bending rigidity gap space between result various deformation profiles, influencing strain rate output power. also investigates independent variation length its impact vortical arrangements flexibility, introducing different oscillation modes. present takes nuanced view overall their mutual effect power output, unlike most existing studies where enhancing amplitude frequency oscillations optimal was main concern. Factors curvature, asymmetry, periodicity have been especially highlighted context corresponding spaces investigated. Interestingly, increase piezo-flapper has seen reduction though it instrumental bringing symmetry back. comprehensive insights into underlying dynamical mechanisms can contribute toward design future devices.

Language: Английский

Passive flow control in the wake of bed-mounted cylinders: a review and new experimental insights DOI Creative Commons
Zia Ud Din Taj, Sabal Bista, Ram Balachandar

et al.

Frontiers in Mechanical Engineering, Journal Year: 2025, Volume and Issue: 11

Published: May 21, 2025

Controlling wake flow behind bed-mounted circular cylinders is required in many engineering applications. This study investigates several passive control mechanisms, including the use of helical strakes, meshes, foam coverings, slots, and holes. A detailed review existing experimental numerical studies conducted to examine principles, applications, effects each method. While extensive research exists on individual techniques, comparative between different methods are notably lacking. Additionally, variations approach conditions across highlight need for a systematic evaluation under identical or near-identical inflow conditions. To address these gaps, particle image velocimetry measurements were employed capture compare unsteady dynamics various types cylinders. Experiments at Reynolds number 1.45×104 , based cylinder diameter. The results show that plain cylinder’s dominated by large recirculation region downstream bifurcation, while meshed shows minimal deviation from characteristics. with holes generate localized turbulence spiraling patterns, diminishing downstream. strakes induce unique channelized sustained downstream, whereas single cross-slotted enhance near-wake velocity via high-velocity jets, particularly configuration, making it ideal heat transfer In contrast, foam-covered effectively reduce fluctuations, offering potential applications requiring stability drag reduction.

Language: Английский

Citations

0
Energy harvesting from wake-induced vibration of flexible flapper behind a bluff body DOI
Rajanya Chatterjee, Chhote Lal Shah, Sayan Gupta

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(11)

Published: Nov. 1, 2024

Piezoelectric energy harvesting from ambient vibrations offers a promising small-scale generation strategy, with wake-induced vibration of flexible structures being an ideal candidate. This study examines bluff body followed by fully piezoelectric flapper in viscous free-stream flow using in-house discrete forcing immersed boundary method-based fluid-structure-electric solver for parametric investigation. Different vortex shedding regimes are identified based on formation around the flapper. The complex and interdependent spatiotemporal dynamics wake dictated parameters such as bending rigidity gap space between result various deformation profiles, influencing strain rate output power. also investigates independent variation length its impact vortical arrangements flexibility, introducing different oscillation modes. present takes nuanced view overall their mutual effect power output, unlike most existing studies where enhancing amplitude frequency oscillations optimal was main concern. Factors curvature, asymmetry, periodicity have been especially highlighted context corresponding spaces investigated. Interestingly, increase piezo-flapper has seen reduction though it instrumental bringing symmetry back. comprehensive insights into underlying dynamical mechanisms can contribute toward design future devices.

Language: Английский

Citations

2