CFD Modelling of Wake-Induced Vibration At Low Reynolds Number

CFD Letters ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 53-64
Author(s):  
Muhammad Ridhwaan Hassim ◽  
Mohd Azan Mohammed Sapardi ◽  
Nur Marissa Kamarul Baharin ◽  
Syed Noh Syed Abu Bakar ◽  
Muhammad Abdullah ◽  
...  
Keyword(s):  
Electrical Energy ◽  
Reynolds Numbers ◽  
Circular Cylinders ◽  
Bluff Bodies ◽  
Flow Induced Vibration ◽  
Cfd Modelling ◽  
Force Coefficient ◽  
Low Reynolds ◽  
Harvesting Process ◽  
Fluid Behaviour

Flow-induced vibration is an enthralling phenomenon in the field of engineering. Numerous studies have been conducted on converting flow kinetic energy to electrical energy using the fundamental. Wake-induced vibration is one of the configurations used to optimise the generation of electricity. The results of the study on the effect of the gap between the multiple bluff bodies will provide insight into optimising the energy harvesting process. This study focuses on fluid behaviour and response behind two circular cylinders arranged in tandem when interacting with a fluid flow at low Reynolds numbers ranging from 200 to 1000. The study has been done on several gap lengths between the two cylinders, between 2D and 5D. The study was carried out numerically by using OpenFOAM. At Re = 1000, it is found that the gap length of 2.5D is optimal in terms of producing the highest lift force coefficient on the downstream circular cylinder.

Flow-induced vibration of a trapezoidal cylinder at low Reynolds numbers

2021 ◽  
Vol 33 (5) ◽  
pp. 053602
Author(s):  
Shubiao Wang ◽  
Wenming Cheng ◽  
Run Du ◽  
Yupu Wang ◽  
Qingrong Chen
Keyword(s):  
Reynolds Numbers ◽  
Flow Induced Vibration ◽  
Low Reynolds Numbers ◽  
Low Reynolds

Surface Roughness Effects on Circular Cylinders at High Reynolds Numbers

2002 ◽  
Author(s):  
M. Eaddy ◽  
W. H. Melbourne ◽  
J. Sheridan
Keyword(s):  
Surface Roughness ◽  
Reynolds Numbers ◽  
Circular Cylinders ◽  
Flow Induced Vibration ◽  
Roughness Effects ◽  
Vortex Induced Vibration ◽  
Smooth Cylinder ◽  
Lift Forces ◽  
High Reynolds ◽  
Effect Of Surface

The problem of flow-induced vibration has been studied extensively. However, much of this research has focused on the smooth cylinder to gain an understanding of the mechanisms that cause vortex-induced vibration. In this paper results of an investigation of the effect of surface roughness on the cross-wind forces are presented. Measurements of the sectional RMS fluctuating lift forces and the axial correlation of the pressures for Reynolds numbers from 1 × 105 to 1.4 × 106 are given. It was found that surface roughness significantly increased the axial correlation of the pressures to similar values found at high subcritical Reynolds numbers. There was little effect of the surface roughness on the sectional lift forces. The improved correlation of the vortex shedding means rough cylinders will be subject to larger cross-wind forces and an increased possibility of vortex-induced vibration compared to smooth cylinders.

Supercritical Reynolds number simulation for two-dimensional flow over circular cylinders

1975 ◽  
Vol 70 (3) ◽  
pp. 529-542 ◽  
Author(s):  
Edmond Szechenyi
Keyword(s):  
Surface Roughness ◽  
Reynolds Number ◽  
Reynolds Numbers ◽  
Practical Significance ◽  
Circular Cylinders ◽  
Wind Tunnels ◽  
Bluff Bodies ◽  
Wide Range ◽  
Two Dimensional Flow ◽  
Different Diameters

In wind-tunnel tests on bluff bodies the Reynolds number is often limited to values that are very much smaller than those of the flows being simulated. In such cases the experiments may have no practical significance whatsoever since both the fluctuating and the steady aerodynamic phenomena can vary considerably with Reynolds number.This difficulty was encountered in an investigation of supercritical incompressible flow over cylinders, and an attempt at artificially increasing the Reynolds number by means of surface roughness was made. In order to evaluate this simulation technique, the influence of various grades of surface roughness on the aerodynamic forces acting on cylinders of different diameters was studied over a wide range of Reynolds numbers in two very different wind tunnels. The results allow very positive conclusions to be drawn.

Some new characteristics of the confined flow over circular cylinders at low reynolds numbers

2020 ◽  
Vol 86 ◽  
pp. 108741
Author(s):  
A. Ooi ◽  
L. Chan ◽  
D. Aljubaili ◽  
C. Mamon ◽  
J.S. Leontini ◽  
...  
Keyword(s):  
Reynolds Numbers ◽  
Circular Cylinders ◽  
Low Reynolds Numbers ◽  
Confined Flow ◽  
Low Reynolds
Sign in / Sign up

Export Citation Format

Share Document