Passive Vibration Reduction in Circular Cylinders: The Role of Slits DOI Open Access
Ussama Ali, Md. Monirul Islam, Isam Janajreh

et al.

Proceedings of the World Congress on Momentum, Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: unknown

Published: April 1, 2024

This work investigates a passive flow control method to mitigate vortex-induced vibration (VIV) by introducing slit into circular structure.The impact of varying sizes on the behaviour cylinder subjected VIV is investigated across different reduced velocities (Ur) at Reynolds number (Re) 100.The size (S/D) adjusted from 0 (without slit) 0.1 & 0.2, where S corresponds width D diameter.The mass and damping ratios are fixed m* = 10 ζ 0.005, respectively, while Ur varied 2 10.The numerical analysis conducted using Ansys/Fluent, incorporating mesh motion consider vibration.The outcomes presented in terms amplitude frequency, drag lift coefficients, Strouhal number, vorticity contours.The findings suggest that reduces effectively suppressing VIV.Examining maximum amplitude, 10% results 5.16% decrease, whereas 20% leads substantial 34.27% reduction compared solid cylinder.

Language: Английский

Vortex-induced vibration and wake interference of two-degree-of-freedom elastically mounted elliptical cylinders in tandem at various spacing DOI
Mehdi Badri Ghomizad,

Hosnieh Kor,

Minh Doan

et al.

Ocean Engineering, Journal Year: 2024, Volume and Issue: 310, P. 118637 - 118637

Published: July 8, 2024

Language: Английский

Citations

6
Wake interference effects on flow-induced vibration of flexible membrane wings DOI
Guojun Li, Rajeev K. Jaiman, Biao Lei

et al.

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

Published: July 1, 2024

This work investigates the effect of wake interference on nonlinear coupled dynamics and aerodynamic performance flexible membrane wings at a moderate Reynolds number. A high-fidelity computational aeroelastic framework is employed to simulate flow-induced vibration in response unsteady vortex flows produced by an upstream stationary circular cylinder. The downstream are investigated different gap ratios, numbers, offset distances. variations flow features, responses, frequency characteristics analyzed understand aeroelasticity. results indicate that flight stability degraded under effect. Four distinct regimes classified for cylinder–membrane configuration, namely (i) single body flow, (ii) co-shedding I, (iii) II, (iv) detached vortex-dominated vibration, respectively. mode transition found build new synchronization between its own surrounding flows, or cylinder, adjust vibration. study sheds light aeroelasticity enhances understanding fluid–membrane coupling mechanism. These findings can facilitate development next-generation bio-inspired drones have high efficiency robust gusty flows.

Language: Английский

Citations

4
Enhancing energy harvesting capability through analysis of flow-induced vibrations in double sprung circular cylinders exposed to turbulent flow: Influence of incidence angle DOI
Amir Hossein Rabiee,

Abbas Naderi,

Mostafa Esmaeili

et al.

Ocean Engineering, Journal Year: 2024, Volume and Issue: 309, P. 118598 - 118598

Published: June 28, 2024

Language: Английский

Citations

3
Dynamic responses of the unbonded composite riser with multi-spacing coupling interference DOI
Peng Li,

Li Zhu,

Yu Wang

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(1)

Published: Jan. 1, 2025

The interference among risers has always been a research focus within marine engineering. By riser, we mean the equipment that transports oil, gas, and other fluid media in environments, connecting offshore platform subsea wellhead. “unbonded composite riser-smooth riser” serves as object of this paper, which experimentally investigates riser group vibration with multi-spacings. This study reveals mechanism interlayer slip by reviewing dynamic response unbonded various arrangements. results indicate increasing displacement side-by-side is subjected to internal cable at high flow velocities. rate peaks, particularly S/D = 4 (S/D spacing ratio, where S represents distance between axis two D outer diameter riser). contrast, changes ratio have little influence on dominant frequency. strong energy dissipation capacity mass-damping efficiently decrease caused forces. Side-by-side occur delayed “lock-in” region opposed smooth under same conditions. Furthermore, wake clearance maximum difference up 5 times greater average value rate.

Language: Английский

Citations

0
Unveiling the dynamics of 2-DOF flow-induced vibrations and heat transfer: A comprehensive study of multi-cylinder configurations DOI Creative Commons
Ussama Ali, Md. Islam, Isam Janajreh

et al.

International Communications in Heat and Mass Transfer, Journal Year: 2025, Volume and Issue: 164, P. 108780 - 108780

Published: March 3, 2025

Language: Английский

Citations

0
An experimental study on effect of curvatures of upstream tube on thermal performance of downstream tube in cross-flow of air DOI Creative Commons

Kunal,

Sushil Kumar Dhiman

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: April 26, 2025

Heat transfer on a straight tube in the wake of same diameter with different curvatures was investigated cross-flow air at Reynolds number 35,000. The given constant heat flux condition and placed spacing ratios 2.0, 2.25, 2.5, 3.0, 3.5, 4.0, from curved tubes blockage ratio 0.1. Four 0.5, 1.0, 1.5 were which aligned mainstream as concave convex profiles forming combinations curvature to analyse their thermal performance. study shows paramount advantage enhanced performance using over identifies number-based inflection point describing "Heat Promoter" upstream segment tube. results illustrate that combination 1.0 2.5 exhibited highest 2.36 times transfer.

Language: Английский

Citations

0
Harnessing flow-induced vibrations for energy harvesting: Experimental and numerical insights using piezoelectric transducer DOI Creative Commons
Md. Islam, Ussama Ali,

Shital Mone

et al.

PLoS ONE, Journal Year: 2024, Volume and Issue: 19(6), P. e0304489 - e0304489

Published: June 10, 2024

Flow-induced vibrations (FIV) were considered as unwanted analogous to noise. However, in a recent trend, the energy of these can be harvested and converted electrical power. In this study, potential FIV source renewable is highlighted through experimental numerical analyses. The study was conducted on an elastically mounted circular cylinder using helical leaf springs wind tunnel. Reynolds number (Re) varied between 2300-16000. motion restricted all directions except transverse direction. micro-electromechanical system (MEMS) spring harvest mechanical energy. Numerical simulations also performed with SST k-ω turbulence model supplement experiments found good agreement results. flow separation vortex shedding induce aerodynamic forces causing it vibrate. 2S pattern observed cases study. maximum dimensionless amplitude vibration (A/D) obtained 0.084 0.068 experimentally numerically, respectively. results showed that region interest lock-in where and, therefore, power output. piezoelectric voltage output recorded for different reduced velocities (Ur = 1-10) at resistance values circuit. It oscillation increases, MEMS increases due high strain transducer. 0.6V Ur 4.95 open circuit, i.e., circuit value infinity. As reduced, drop observed. Maximum 10.5μW 100Ω.

Language: Английский

Citations

3
Coupled CFD-DEM Numerical Simulation of the Interaction of a Flow-Transported Rag with a Solid Cylinder DOI Open Access
Yun Ren,

Lianzheng Zhao,

Xiaofan Mo

et al.

Fluid dynamics & materials processing, Journal Year: 2024, Volume and Issue: 20(7), P. 1593 - 1609

Published: Jan. 1, 2024

A coupled Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) approach is used to calculate the interaction of a flexible rag transported by fluid current with fixed solid cylinder.More specifically hybrid Eulerian-Lagrangian being modeled as set interconnected particles.The influence various parameters considered, namely inlet velocity (1.5, 2.0, and 2.5 m/s, respectively), angle formed initially straight flow direction (45°, 60°and 90°, position (90, 100, 110 mm, respectively).The results show that rate has significant impact on permeability rag.The higher rate, speed difference.The minor effect permeability, 45°being most favorable for permeability.The small while reducing initial distance between an cylinder makes it easier rags pass through.

Language: Английский

Citations

1
Modelling of wake-induced vibration of a long-span bridge with separated parallel nonidentical decks DOI

Yubing Song,

Zilong Ti, Yongle Li

et al.

Structures, Journal Year: 2024, Volume and Issue: 69, P. 107427 - 107427

Published: Oct. 2, 2024

Language: Английский

Citations

1
Passive Vibration Reduction in Circular Cylinders: The Role of Slits DOI Open Access
Ussama Ali, Md. Monirul Islam, Isam Janajreh

et al.

Proceedings of the World Congress on Momentum, Heat and Mass Transfer, Journal Year: 2024, Volume and Issue: unknown

Published: April 1, 2024

This work investigates a passive flow control method to mitigate vortex-induced vibration (VIV) by introducing slit into circular structure.The impact of varying sizes on the behaviour cylinder subjected VIV is investigated across different reduced velocities (Ur) at Reynolds number (Re) 100.The size (S/D) adjusted from 0 (without slit) 0.1 & 0.2, where S corresponds width D diameter.The mass and damping ratios are fixed m* = 10 ζ 0.005, respectively, while Ur varied 2 10.The numerical analysis conducted using Ansys/Fluent, incorporating mesh motion consider vibration.The outcomes presented in terms amplitude frequency, drag lift coefficients, Strouhal number, vorticity contours.The findings suggest that reduces effectively suppressing VIV.Examining maximum amplitude, 10% results 5.16% decrease, whereas 20% leads substantial 34.27% reduction compared solid cylinder.

Language: Английский

Citations

0