Numerical Simulation of Unsteady Flow and Aerodynamic Performance of Vertical Axis Wind Turbines with LES

Iida, A., Kato, K. and Mizuno, A. (2007). Numerical Simulation of Unsteady Flow and Aerodynamic Performance of Vertical Axis Wind Turbines with LES. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Charles Lemckert, 16th Australasian Fluid Mechanics Conference (AFMC). 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (1295-1298). 3-7 December, 2007.

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Author Iida, A.
Kato, K.
Mizuno, A.
Title of paper Numerical Simulation of Unsteady Flow and Aerodynamic Performance of Vertical Axis Wind Turbines with LES
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Proceedings title 16th Australasian Fluid Mechanics Conference (AFMC)
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Charles Lemckert
Start page 1295
End page 1298
Total pages 4
Collection year 2007
Language eng
Abstract/Summary The goal of this investigation is to develop high performance Vertical Axis Wind Turbines (hereafter VAWT) for clean energy supply systems. For this purpose, we attempted to simulate flow around a VAWT with Large Eddy Simulation (LES). Since the angles of attack of VAWT are widely changed during the rotor rotation, large scale separation and interaction between the turbulent wakes are occurred [1]-[3]. Therefore, unsteady and high accuracy simulation is necessary to simulate flow around a VAWT. LES with a sliding mesh technique was utilised to solve the complicated flow around the VAWT. The numerical results show the large separation occurred and unsteady aerodynamic forces were observed in the wake of VAWT. The time ratio of negative torque generated after rotor rotation time was small at a tip-speed ratio (TSR) of 3. Therefore, the maximum power coefficient can be obtained at a TSR of 3. In the case of high TSRs, the predicted results were in good agreement with that of momentum theory. However, the discrepancies among torque coefficient between the results of LES and momentum theory were large at low tip-speed ratios. The discrepancy seems to occur with the effect of dynamic stall. The study revealed that the LES is a suitable method to estimate the performance of VAWT.
Subjects 290201 Aerodynamics
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Wed, 19 Dec 2007, 15:25:04 EST by Laura McTaggart on behalf of School of Engineering