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DES vs RANS: The flatback airfoil case

Papadakis, G., Manolesos, M. ORCID: 0000-0002-5506-6061, Diakakis, K. and Riziotis, V. A. (2020). DES vs RANS: The flatback airfoil case. Journal of Physics: Conference Series, 1618(5), 052062. doi: 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 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.

Publication Type: Article
Additional Information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date available in CRO: 02 Nov 2021 08:36
Date deposited: 2 November 2021
Date of first online publication: 30 September 2020
URI: https://openaccess.city.ac.uk/id/eprint/26996
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