CORE
🇺🇦
make metadata, not war
Services
Services overview
Explore all CORE services
Access to raw data
API
Dataset
FastSync
Content discovery
Recommender
Discovery
OAI identifiers
OAI Resolver
Managing content
Dashboard
Bespoke contracts
Consultancy services
Support us
Support us
Membership
Sponsorship
Community governance
Advisory Board
Board of supporters
Research network
About
About us
Our mission
Team
Blog
FAQs
Contact us
unknown
Effects of wind speed changes on wake instability of a wind turbine in a virtual wind tunnel using large eddy simulation
Authors
Aderson
Ainslie
+32 more
Amanullah Choudhry
Barthelmie
Burton
Chamorro
Germano
Gómez-Elvira
Hansen
Hinze
Ivanell
Jang-Oh Mo
Jensen
Kraichnan
Launder
Lilly
Lissaman
Lissaman
Maziar Arjomandi
Menter
Mo
Mo
Okulov
Richard Kelso
Sanderse
Shimizu
Simms
Smagorinsky
Smirnov
Sørensen
Vermeer
Wagner
Wu
Young-Ho Lee
Publication date
1 January 2013
Publisher
'Elsevier BV'
Doi
Cite
Abstract
Large Eddy Simulation (LES) of the National Renewable Energy Laboratory (NREL) Phase VI wind turbine inside a virtual wind tunnel, with the same test section as that of NASA Ames 24.4. m×36.6. m, was carried out in order to analyze and better understand the wake instability and its breakdown behind the wind turbine. LES was performed using the commercial CFD software, ANSYS FLUENT, based on the dynamic Smagorinsky-Lilly model. The wind turbine was placed at a distance of two rotor diameters from the upstream boundary with a downstream domain of 20 rotor diameters in length. The results of the simulation were compared with the experimental data published by the NREL and a good agreement was found between the two. Furthermore, the average turbulence intensities from the LES were compared with a semi-empirical model and very good agreement was observed, except for the regions of on-going wake instability and vortex breakdown. It was observed that the wake behind the wind turbine consists of a system of intense and stable rotating helical vortices. These vortices persisted for some distance downstream of the wind turbine and finally become unstable producing a sinuous shape. The downstream distance at which wake instability and vortex breakdown occur, was observed to be a function of the upstream wind speed. For example, for an upstream wind speed of 7. m/s, it was observed that the primary vortex structure became unstable at a downstream distance of four rotor diameters and complete breakdown occurred at approximately six rotor diameters. On the other hand, when the upstream wind speed was 15.1. m/s, wake instability occurred at approximately 11 rotor diameters downstream of the wind turbine and complete breakdown was observed at 13 rotor diameters downstream of the wind turbine. Furthermore, it was observed that the turbulence intensity rapidly decreased during the process of wake instability and vortex breakdown; the location of the decrease is a function of the upstream wind speed. It is suggested that the distinction between the near and far wake can be identified as the average location between the start of the wake instability and the end of the process, at complete breakdown. Therefore the average location of this boundary is a function of the upstream wind speed. Hence for upstream wind speeds of 7. m/s, 10. m/s, 13.1. m/s and 15.1. m/s, the boundary between the near and far wake lies at five, seven, ten and twelve rotor diameters downstream respectively. © 2013 Elsevier Ltd.Jang-Oh Mo, Amanullah Choudhry, Maziar Arjomandi, Richard Kelso, Young-Ho Le
Similar works
Full text
Open in the Core reader
Download PDF
Available Versions
Crossref
See this paper in CORE
Go to the repository landing page
Download from data provider
info:doi/10.1016%2Fj.jweia.201...
Last time updated on 01/04/2019
Adelaide Research & Scholarship
See this paper in CORE
Go to the repository landing page
Download from data provider
oai:digital.library.adelaide.e...
Last time updated on 05/08/2013