Vortex induced vibration and vortex shedding characteristics of two side-by-side circular cylinders of different diameters in close proximity in steady flow

2014 ◽  
Vol 48 ◽  
pp. 260-279 ◽  
Author(s):  
Mehran Rahmanian ◽  
Liang Cheng ◽  
Ming Zhao ◽  
Tongming Zhou
Keyword(s):  
Steady Flow ◽  
Vortex Shedding ◽  
Circular Cylinders ◽  
Vortex Induced Vibration ◽  
Close Proximity ◽  
Different Diameters

Numerical investigation of vortex-induced vibration for two tandem circular cylinders with different diameters

2020 ◽  
Vol 234 (3) ◽  
pp. 676-685
Author(s):  
Ming-ming Liu ◽  
Rui-jia Jin ◽  
Guo-qiang Tang ◽  
Cheng-yong Li
Keyword(s):  
Vortex Shedding ◽  
Vibration Amplitude ◽  
Stokes Equations ◽  
Euler Method ◽  
Circular Cylinders ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Vortex Induced Vibration ◽  
Different Diameters ◽  
Vortex Shedding Modes

Vortex-induced vibration of two tandem circular cylinders with different diameters under low Reynolds number (Re = 200) is investigated numerically by solving the uncompressible two-dimensional Navier–Stokes equations. The arbitrary Lagrange–Euler method is used to simulate the movement of mesh. Effects of diameters and gap ratios are considered. Numerical results show that diameter ratios and gap ratios have little effect on maximum vibration amplitude. Four different vortex shedding modes are detected in this study.

scholarly journals Three-dimensional flow around two circular cylinders of different diameters in a close proximity

2015 ◽  
Vol 27 (8) ◽  
pp. 085106 ◽  
Author(s):  
Jitendra Thapa ◽  
Ming Zhao ◽  
Liang Cheng ◽  
Tongming Zhou
Keyword(s):  
Three Dimensional ◽  
Circular Cylinders ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Close Proximity ◽  
Different Diameters

Numerical Simulation of Oscillatory Flow Around Two Circular Cylinders of Different Diameters

2006 ◽  
Author(s):  
Hongwei An ◽  
Liang Cheng ◽  
Ming Zhao ◽  
Guohai Dong
Keyword(s):  
Experimental Data ◽  
Vortex Shedding ◽  
Oscillatory Flow ◽  
Stokes Equations ◽  
Circular Cylinders ◽  
Navier Stokes ◽  
Oscillatory Flows ◽  
Navier Stokes Equations ◽  
Different Diameters ◽  
Small Cylinder

A detailed study of oscillatory flow around two circular cylinders of different diameters is carried out numerically. The Reynolds-averaged Navier-Stokes equations are solved using a finite element method (FEM) with a k–ω turbulence closure. The numerical model is validated against oscillatory flows past a single circular cylinder where the experimental data are available in literature. Then it is employed to simulate the flow around two circular cylinders. It’s found that the fluid flow field around two cylinders is different from the single cylinder case, especially when the small cylinder diameter increases. The orientation of the small cylinder and the gap between two cylinders have significant effects on the vortex shedding process and force coefficients on the cylinders.

Numerical Simulation of Vortex-Induced Vibration of Two Rigidly Connected Cylinders in Side-by-Side and Tandem Arrangements Using RANS Model

2015 ◽  
Vol 138 (2) ◽  
Author(s):  
Ming Zhao ◽  
Joshua M. Murphy ◽  
Kenny Kwok
Keyword(s):  
Vortex Shedding ◽  
Flow Direction ◽  
Response Amplitude ◽  
Maximum Response ◽  
Circular Cylinders ◽  
Tandem Arrangement ◽  
Vortex Induced Vibration ◽  
Single Cylinder ◽  
Gap Ratio ◽  
G Ratio

Vortex-induced vibration (VIV) of two rigidly connected circular cylinders in side-by-side and tandem arrangements in the cross-flow direction was investigated using two-dimensional (2D) numerical simulations. The 2D Reynolds-Averaged Navier–Stokes (RANS) equations were solved for the flow, and the equation of the motion was solved for the response of the cylinders. Simulations were conducted for a constant mass ratio of 2.5, gap ratios G (ratio of the gap between the cylinders to the cylinder diameter) in the range of 0.5 to 3, and reduced velocities in the range of 1 to 30. The effects of the gap ratio on the response of the cylinders were analyzed extensively. The maximum response amplitude in the lock-in regime was found to occur at G = 0.5 in the side-by-side arrangement, which is about twice that of a single cylinder. In the side-by-side arrangement, the response regime of the cylinders for gap ratios of 1.5, 2, 2.5, and 3 is much narrower than that of a single cylinder, because the vortex shedding from the two cylinders is in an out-of-phase pattern at large reduced velocities. In the tandem arrangement, the maximum response amplitude of the cylinders is greater than that of a single cylinder for all the calculated gap ratios. For the gap ratio of 0.5 in the tandem arrangement, the vortex shedding frequency from the upstream cylinder was not observed in the vibration at large reduced velocities, and the response is galloping.

Vortex shedding in the flow around two side-by-side circular cylinders of different diameters

2017 ◽  
Vol 29 (3) ◽  
pp. 470-478 ◽  
Author(s):  
Xiang Qiu ◽  
Zhen-xiao Bi ◽  
Jian-ping Luo ◽  
Yu-lu Liu
Keyword(s):  
Vortex Shedding ◽  
Circular Cylinders ◽  
Different Diameters

Numerical simulations of steady flow past two cylinders in staggered arrangements

2015 ◽  
Vol 765 ◽  
pp. 114-149 ◽  
Author(s):  
Feifei Tong ◽  
Liang Cheng ◽  
Ming Zhao
Keyword(s):  
Steady Flow ◽  
Vortex Shedding ◽  
Numerical Study ◽  
Cross Flow ◽  
Circular Cylinders ◽  
Velocity Signal ◽  
Flow Features ◽  
Flow Information ◽  
Lift Forces ◽  
Pitch Distance

AbstractThis paper presents a numerical study on steady flow around two identical circular cylinders of various arrangements at a low subcritical Reynolds number ($\mathit{Re}=10^{3}$). The ratio of centre-to-centre pitch distance ($P$) to the diameter of the cylinder ($D$) ranges from 1.5 to 4, and the alignment angle $({\it\alpha})$ between the two cylinders and the direction of the cross-flow varies from 0 to 90°. The detailed flow information obtained from direct numerical simulation allows a comprehensive interpretation of the underlying physics responsible for some interesting flow features observed around two staggered cylinders. Four distinct vortex shedding regimes are identified and it is demonstrated that accurate classification of vortex shedding regimes around two staggered cylinders should consider the combination of the flow visualization with the analyses of lift forces and velocity signal in the wake. It is revealed that the change in pressure distribution, as a result of different vortex shedding mechanisms, leads to a variety of characteristics of hydrodynamic forces on both cylinders, including negative drag force, attractive and repulsive lift forces. Two distinct vortex shedding frequencies are identified and are attributed to the space differences based on the flow structures observed in the wake of the cylinders. It is also found that the three-dimensionality of flow in the gap and the shared wake region is significantly weakened in almost two of the classified flow regimes; however, compared with the flow around a single cylinder, active wake interaction at large ${\it\alpha}$ does not clearly increase the three-dimensionality.

Vortex Shedding with Fluid Mechanics from Two Cylinders of Different Diameters in a Tandem Arrangement

2014 ◽  
Vol 886 ◽  
pp. 436-439
Author(s):  
Yong Tao Wang ◽  
Zhong Min Yan ◽  
Hui Min Wang
Keyword(s):  
Reynolds Number ◽  
Fluid Mechanics ◽  
Vortex Shedding ◽  
Diameter Ratio ◽  
Circular Cylinders ◽  
Tandem Arrangement ◽  
Gap Ratio ◽  
Different Diameters ◽  
Upstream Control ◽  
Control Cylinder

The vortex shedding from two circular cylinders of different diameters in a tandem arrangement is numerically investigated at a Reynolds number of 100 and 150. The studied Reynolds number based on the diameter of the downstream main cylinder. The diameter of the downstream main cylinder was kept constant, and the diameter ratio between the upstream control cylinder and the downstream one was varied from 0.1 to 1.0. The gap between the control cylinder and the main cylinder ranged from 0.1 to 4.0 times the diameter of the main cylinder. It is concluded that the gap ratio and the diameter ratio between the two cylinders have important effects on vortex shedding from two cylinders of different diameters in a tandem arrangement.

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