Numerical Simulation of Two-Degree-of-Freedom Vortex-Induced Vibration of a Circular Cylinder Between Two Lateral Plane Walls in Steady Currents

2012 ◽  
Vol 134 (10) ◽  
Author(s):  
Ming Zhao ◽  
Feifei Tong ◽  
Liang Cheng
Keyword(s):  
Numerical Simulation ◽  
Circular Cylinder ◽  
Mass Ratio ◽  
Vortex Induced Vibration ◽  
Lateral Plane ◽  
Low Mass ◽  
Low Mass Ratio ◽  
Lock In ◽  
Two Degree Of Freedom ◽  
Lateral Walls

Vortex-induced vibration (VIV) of a circular cylinder at a low mass ratio of 1.5 between two lateral walls is investigated numerically. The focus of the study is to examine the effects of the two lateral walls on the VIV. Numerical simulations are carried out for w/D = 4, 6, 10, and 20 with D and w being the cylinder diameter and the distance between the two walls, respectively. It is found that the effects of the two walls on the VIV are obvious as w/D ≤ 6 and negligibly small as w/D = 10. The VIV amplitudes in both x- and y-directions increase with the increasing w/D in the lock-in regime.

Numerical Simulation of the Damping Influence on Vortex-Induced Vibration

2012 ◽  
Vol 226-228 ◽  
pp. 146-149
Author(s):  
Zhong Jun Yin ◽  
Yan Shu Cao ◽  
Tian Han ◽  
Xiao Song Wang
Keyword(s):  
Numerical Simulation ◽  
Damping Ratio ◽  
Mass Ratio ◽  
Frequency Locking ◽  
Amplitude Response ◽  
Vortex Induced Vibration ◽  
Computing Model ◽  
Sst Turbulence Model ◽  
Low Mass ◽  
Low Mass Ratio

The main purpose of the numerical simulation that described in this paper is to investigate the damping influence on vortex-induced vibration (VIV) system. By considering different damping ratios, the 1-dof vortex-induced vibration of a rigid cylinder with low mass ratio is investigated numerically by the RANS solver combined with SST turbulence model. Comparing of the simulation results that obtained under low damping ratio by J.S. Wang and experimental results which carried out by Williamson and Govardhan, it indicates that the computing model in this paper is reliable. In addition, by using our model we analyze the vibration under the other two damping ratios, including the corresponding amplitude response and frequency response. We observed significant frequency locking phenomenon under different damping conditions, and locking region decreases with increasing damping.

scholarly journals Two improvements on numerical simulation of 2-DOF vortex-induced vibration with low mass ratio

2017 ◽  
Vol 31 (6) ◽  
pp. 764-772 ◽  
Author(s):  
Zhuang Kang ◽  
Wen-chi Ni ◽  
Xu Zhang ◽  
Li-ping Sun
Keyword(s):  
Numerical Simulation ◽  
Mass Ratio ◽  
Vortex Induced Vibration ◽  
Low Mass ◽  
Low Mass Ratio

Study on the Test Results of Cross-Flow Vortex-Induced Vibration of a Towed Circular Cylinder

2014 ◽  
Author(s):  
Wei-Wu Wu ◽  
Quan-Ming Miao ◽  
Yan-Xia Wang
Keyword(s):  
Circular Cylinder ◽  
Natural Frequency ◽  
Cross Flow ◽  
Test Cases ◽  
Test Results ◽  
Vortex Induced Vibration ◽  
Low Mass ◽  
Low Mass Ratio ◽  
Flow Vortex ◽  
Lock In

This paper gives a review on VIV experimental research. A detailed introduction of the experimental study on the cross-flow vortex-induced vibration of a towed circular cylinder in CSSRC’s towing tank is presented and classical VIV phenomena are explained and analyzed in this study. However, some results which are much different from those in the classical literatures in the past few decades are observed at the same time. For example, instead of reduced velocity Ur from 5 to 8, the “lock-in” region happened in the reduced velocity ranged from 10 to 14 in our tests, where the reduced velocity is calculated by the natural frequency. The non-dimensional frequency (oscillation frequency over natural frequency) of about 1.8 in the “lock-in” region is also different from that of 1.0 in the classical literatures. Interestingly, the author found that some of the results given by Moe and Wu (1990), Sarpkaya (1995), Govardhan and Williamson (2000), Pan zhiyuan (2005) and so on, reported the similar phenomenon. Since above listed papers have the same points of view, whether can we say that the results in this paper are possible for the case of low mass ratio. To conclude that, however, many questions need to be answered. In an effort to gain a better understanding of VIV phenomenon, this paper presents results of further analysis on the test cases and parameters.

Vortex-Induced Vibration of a Circular Cylinder With Low Mass Ratio Near a Plane Wall

2017 ◽  
Author(s):  
Sina Daneshvar ◽  
Chris Morton
Keyword(s):  
Circular Cylinder ◽  
Mean Field ◽  
Cylinder Wall ◽  
Mass Ratio ◽  
Amplitude Response ◽  
Vortex Induced Vibration ◽  
Wall Boundary ◽  
Wide Range ◽  
Low Mass ◽  
Low Mass Ratio

Vortex induced vibration of a circular cylinder with low mass ratio in vicinity of a wall boundary is investigated experimentally in a water tunnel facility. Simultaneous measurements of the flow field via planar Particle Image Velocimetry and amplitude response have been carried out across a wide range of reduced velocities and cylinder-wall gap ratios (S* = S/D). For S* ≥ 3, both the amplitude response and the wake development are not significantly affected by the presence of the wall boundary. As S* is decreased below 3, the amplitude response decreases until S* ≈ 0.5, where the cylinder begins to periodically impact the wall. For all S* ≤ 0.5, the cylinder continues to impact the wall in a periodic fashion, and the reduced velocity range over which this occurs increases. Mean field and RMS field statistics revealed strong asymmetric wake development for S* < 3. Proper Orthogonal Decomposition of the velocity data was used to investigate the energy distribution in the coherent wake structures, and to filter the incoherent fluctuations via construction of a Reduced Order Model. Reconstructions of instantaneous vorticity fields obtained from the ROM illustrate the changes in vortex shedding patterns with the cylinder response.

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