DES vs RANS: The flatback airfoil case

Papadakis, George; Manolesos, Marinos; Diakakis, Konstantinos; Riziotis, Vasilis A.

doi:10.1088/1742-6596/1618/5/052062

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DES vs RANS: The flatback airfoil case

George Papadakis, Marinos Manolesos

, Konstantinos Diakakis, Vasilis A. Riziotis

Journal of Physics: Conference Series, Volume: 1618, Start page: 052062

Swansea University Author: Marinos Manolesos

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DOI (Published version): 10.1088/1742-6596/1618/5/052062

Abstract

Using flatback airfoils at the root of wind turbine (WT) blades is becoming more popular as the WTs increase in size. The reason is that they provide significant aerodynamic, aeroelastic and structural benefits. However, due to the blunt trailing edge (TE), the wake of such airfoils is highly unstea...

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Published in:	Journal of Physics: Conference Series
ISSN:	1742-6588 1742-6596
Published:	IOP Publishing 2020
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa55485

first_indexed	2020-10-22T13:18:10Z
last_indexed	2020-12-11T04:19:46Z
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spelling	2020-12-10T14:13:16.0324181 v2 55485 2020-10-22 DES vs RANS: The flatback airfoil case 44a3e0d351ccd7a8365d5fc7c50c8778 0000-0002-5506-6061 Marinos Manolesos Marinos Manolesos true false 2020-10-22 ACEM Using flatback airfoils at the root of wind turbine (WT) blades is becoming more popular as the WTs increase in size. The reason is that they provide significant aerodynamic, aeroelastic and structural benefits. However, due to the blunt trailing edge (TE), the wake of such airfoils is highly unsteady and rich in three-dimensional vortical structures. This poses significant challenges on the numerical simulation of the flow around them, given the highly unsteady, three-dimensional turbulent character of their wake. In this work, computational predictions for a flatback airfoil employing both RANS and DES approaches on three successively refined grids up to 25 million cells are compared with available experimental data. Results suggest that even though URANS and DDES are in good agreement in terms of lift and drag, RANS simulations fail to accurately capture the turbulent wake unsteady characteristics. Journal Article Journal of Physics: Conference Series 1618 052062 IOP Publishing 1742-6588 1742-6596 22 9 2020 2020-09-22 10.1088/1742-6596/1618/5/052062 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2020-12-10T14:13:16.0324181 2020-10-22T14:15:40.5825838 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised George Papadakis 1 Marinos Manolesos 0000-0002-5506-6061 2 Konstantinos Diakakis 3 Vasilis A. Riziotis 4 55485__18472__d5d7a01dbc4b4e08a34ecf964ec1653f.pdf 55485.pdf 2020-10-22T14:17:53.5574978 Output 6720300 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 3.0 Licence. true eng http://creativecommons.org/licenses/by/3.0
title	DES vs RANS: The flatback airfoil case
spellingShingle	DES vs RANS: The flatback airfoil case Marinos Manolesos
title_short	DES vs RANS: The flatback airfoil case
title_full	DES vs RANS: The flatback airfoil case
title_fullStr	DES vs RANS: The flatback airfoil case
title_full_unstemmed	DES vs RANS: The flatback airfoil case
title_sort	DES vs RANS: The flatback airfoil case
author_id_str_mv	44a3e0d351ccd7a8365d5fc7c50c8778
author_id_fullname_str_mv	44a3e0d351ccd7a8365d5fc7c50c8778_***_Marinos Manolesos
author	Marinos Manolesos
author2	George Papadakis Marinos Manolesos Konstantinos Diakakis Vasilis A. Riziotis
format	Journal article
container_title	Journal of Physics: Conference Series
container_volume	1618
container_start_page	052062
publishDate	2020
institution	Swansea University
issn	1742-6588 1742-6596
doi_str_mv	10.1088/1742-6596/1618/5/052062
publisher	IOP Publishing
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description	Using flatback airfoils at the root of wind turbine (WT) blades is becoming more popular as the WTs increase in size. The reason is that they provide significant aerodynamic, aeroelastic and structural benefits. However, due to the blunt trailing edge (TE), the wake of such airfoils is highly unsteady and rich in three-dimensional vortical structures. This poses significant challenges on the numerical simulation of the flow around them, given the highly unsteady, three-dimensional turbulent character of their wake. In this work, computational predictions for a flatback airfoil employing both RANS and DES approaches on three successively refined grids up to 25 million cells are compared with available experimental data. Results suggest that even though URANS and DDES are in good agreement in terms of lift and drag, RANS simulations fail to accurately capture the turbulent wake unsteady characteristics.
published_date	2020-09-22T07:54:17Z
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score	11.055565

DES vs RANS: The flatback airfoil case

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