School of Civil, Environmental and Mining Engineering

Postgraduate research

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Current and completed research by our postgraduate students.

Contact

Azlin Mohd Azmi

Phone: (+61 8) 6488 1733


Start date

Oct 2011

Submission date

Azlin Mohd Azmi

Thesis

Suppression of Vortex-Induced Vibration using Perforated Shrouds

Summary

Fluid flow past a circular cylinder is a problem of fundamental interest as it resembles many practical engineering applications. Vortices formed and shed behind a cylinder gives rise to the fluctuating lift and drag forces. These oscillating forces cause the cylinder to vibrate. If a cylinder is flexibly mounted, and the frequency of the resulting oscillating transverse force closely approximates the natural frequency of the cylinder, vibration of large amplitude is likely to occur which leads to the lock-in phenomenon. This vibration is generally termed as the Vortex-Induced Vibrations (VIV). In many engineering applications, VIV of cylindrical structures should be avoided as it will lead to fatigue damage of the structures.VIV can be suppressed using either passive or active methods. Passive method includes the use of an add-on device. Perforated shroud is one of the add-on devices effective for perturbing vortex shedding. Little attention has been given to the study and analysis of this type of device in the recent years, despite its potential. Our understanding of the shroud mechanism is still incomplete. The goal of the present research is to understand the flow physics and the mechanism of the shrouds that aid to the suppression of vortex shedding and consequently the vibration of a structure.

Why my research is important

The study will contribute to the discovery of knowledge on the mechanism of vortex shedding using a screen shroud and its effectiveness in suppressing VIV.


 

School of Civil, Environmental and Mining Engineering

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Last updated:
Thursday, 19 September, 2013 11:39 AM

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