Flow-induced vibrations of a pair of in-line square cylinders

2021 ◽  
Vol 33 (4) ◽  
pp. 043602
Author(s):  
Deepak Kumar ◽  
Subhankar Sen
Keyword(s):  
Square Cylinders ◽  
Flow Induced Vibrations

scholarly journals Amplitude Enhancement of Flow-Induced Vibration for Energy Harnessing

2020 ◽  
Vol 160 ◽  
pp. 01005
Author(s):  
Ze Shao ◽  
Tongming Zhou ◽  
Hongjun Zhu ◽  
Zhipeng Zang ◽  
Wenhua Zhao
Keyword(s):  
Wind Tunnel ◽  
Circular Cylinders ◽  
Bluff Bodies ◽  
Flow Induced Vibration ◽  
Cross Sectional ◽  
Square Cylinders ◽  
Gap Ratio ◽  
Flow Induced Vibrations ◽  
Energy Harnessing ◽  
Single Configuration

In this paper, flow-induced vibrations of bluff bodies with four different cross-sectional geometries (circle, square, triangle and semi-circle) arranged both in single and tandem (gap ratio equals to 3 and 5) configurations are investigated in a wind tunnel. It is found that triangular and square cylinders have the higher amplitude than that of the semi-circular and the circular cylinders in the single configuration. When two cylinders are arranged in tandem, the circular cylinders have the highest amplitude among all tested cylinders. Furthermore, the semi-circular cylinder shows that its vibrating amplitude increases with the reduced velocity in the tandem system due to the galloping effect.

Vibration and Stability Behaviour of Sandwiched Viscoelastic Pipes Conveying a Non-Newtonian Fluid

2010 ◽  
Author(s):  
Vincent O. S. Olunloyo ◽  
Charles A. Osheku ◽  
Sidikat I. Kuye
Keyword(s):  
Newtonian Fluid ◽  
Fluid Velocity ◽  
Linear Equations ◽  
Steel Pipes ◽  
Flow Parameters ◽  
Internal Fluid ◽  
Reduction Mechanisms ◽  
Internal Fluid Flow ◽  
Flow Induced Vibrations ◽  
Flow Variables

Internal fluid flow parameters in conjunction with elastomechanical properties of conveyance systems have significantly modulated flow induced vibrations in pipeline and riser systems. Recent advances on the mechanics of sandwich elastic systems as effective vibration and noise reduction mechanisms have simulated the possibility of replacing traditional steel pipes with sandwich pipes in deepwater environment. The dynamic behaviour and stability of sandwich elastic pipes conveying a non-Newtonian fluid are investigated in this paper. For this problem, a set of generalised non-linear equations governing the vibration of sandwich pipes held together in pressurised environment and conveying a non-Newtonian fluid is presented. By linearizing the governing partial differential equation matching the problem physics, under slight perturbation of the internal fluid velocity and other flow variables closed form analytical results for the system dual natural frequencies and stability under external excitation are computed for field designs and applications. Results show that for a given length of pipe, beyond the critical velocity, instability increases with the velocity of conveyance.

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