Effect of diameter ratio on the flow-induced vibrations of two rigidly coupled circular cylinders in tandem

2019 ◽  
Vol 89 ◽  
pp. 96-107 ◽  
Author(s):  
F.J. Huera-Huarte ◽  
J.I. Jiménez-González
Keyword(s):  
Diameter Ratio ◽  
Circular Cylinders ◽  
Flow Induced Vibrations

The supersonic and low-speed flows past circular cylinders of finite length supported at one end

1962 ◽  
Vol 12 (3) ◽  
pp. 367-387 ◽  
Author(s):  
D. M. Sykes
Keyword(s):  
Mach Number ◽  
Finite Length ◽  
Central Region ◽  
Diameter Ratio ◽  
Circular Cylinders ◽  
Form Drag ◽  
Drag Coefficients ◽  
Low Speed ◽  
Flow Past ◽  
Length To Diameter Ratio

The flow past circular cylinders of finite length, supported at one end and lying with their axes perpendicular to a uniform stream, has been investigated in a supersonic stream at Mach number 1.96 and also in a low-speed stream. In both stream it was found that the flow past the cylinders could be divided into three regions: (a) a central region, (b) that near the free end of the cylinder, and (c) that near the supported end. The locations of the second and third regions were found to be almost independent of the cylinder length-to-diameter ratio, provided that this exceeded 4, while the flow within and the extent of the first region were dependent on this ratio. Form-drag coefficients determined in the central region in the supersonic flow were in close agreement with the values determined at the same Mach number by other workers. In the low-speed flow the local form-drag coefficients were dependent on length-to-diameter ratio and were always less than that of an infinite-length cylinder at the same Reynolds number.

218 Characteristics of Flow-Induced Vibrations of Two Circular Cylinders in Side by Side Arrangement

2006 ◽  
Vol 2006.45 (0) ◽  
pp. 75-76
Author(s):  
Sangil KIM ◽  
Hiroshi SAKAMOTO ◽  
Kazunori TAKAI ◽  
Yoshihiro OBATA
Keyword(s):  
Circular Cylinders ◽  
Flow Induced Vibrations

Nonlinear Dynamics and Design of Aeroelastic Energy Harvesters

2015 ◽  
pp. 341-379
Author(s):  
Abdessattar Abdelkefi
Keyword(s):  
Wireless Sensors ◽  
Performance Enhancement ◽  
Circular Cylinders ◽  
Medical Implants ◽  
Energy Harvesters ◽  
Vortex Induced Vibrations ◽  
Flow Induced Vibrations ◽  
Self Powered ◽  
And Performance

The concept of harvesting energy from flow-induced vibrations has received a great deal of attention in the last few years. This technology would help in the replacement of small batteries that require expensive and time consuming maintenance and development of self-powered electronic devices, such as health monitoring sensors, medical implants, data transmitters, wireless sensors, and cameras. In this chapter, a particular focus is paid to the concept of harvesting energy from aeroelastic instabilities, such as flutter in airfoil sections, vortex-induced vibrations in circular cylinders, and galloping in prismatic structures. Nonlinear electroaeroelastic models for these energy harvesters are derived and validated with experimental measurements. It is shown how linear and nonlinear analyses can be used to breach traditional barriers in the design and performance enhancement of these aeroelastic energy harvesters, characterization of their behaviors, and identification of the contribution of different types of nonlinearities.

Drag Coefficients Acting on Two Tandem Cylinders of Different Diameters

2014 ◽  
Vol 886 ◽  
pp. 413-416
Author(s):  
Yong Tao Wang ◽  
Zhong Min Yan ◽  
Hui Min Wang
Keyword(s):  
Flow Characteristics ◽  
Diameter Ratio ◽  
Circular Cylinders ◽  
Drag Coefficients ◽  
Tandem Cylinders ◽  
Gap Ratio ◽  
Different Diameters ◽  
Volume Method ◽  
Upstream Control ◽  
Control Cylinder

The flow past two tandem circular cylinders of different diameters is simulated by using a finite volume method. The diameter of the downstream main cylinder is kept constant, and the diameter ratio between the upstream control cylinder and the downstream one is varied from 0.1 to 1.0. The Reynolds number based on the diameter of the downstream main cylinder is 100 and 150. The gap between the control cylinder and the main cylinder ranges 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 the drag coefficients and flow characteristics.

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