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Energies 2018, 11(8), 2091; https://doi.org/10.3390/en11082091

Computational Modeling of Gurney Flaps and Microtabs by POD Method

1
Nuclear Engineering and Fluid Mechanics Department, University Basque Country, UPV/EHU, 01006 Vitoria, Spain
2
Department Ecuac Diferenciales & Anal Numer, Fac Mathematics, University Seville, 41012 Seville, Spain
3
Instituto de Matemáticas Universidad de Sevilla (IMUS), University Seville, 41012 Seville, Spain
*
Author to whom correspondence should be addressed.
Received: 6 July 2018 / Revised: 7 August 2018 / Accepted: 10 August 2018 / Published: 11 August 2018
(This article belongs to the Special Issue 10 Years Energies - Horizon 2028)
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Abstract

Gurney flaps (GFs) and microtabs (MTs) are two of the most frequently used passive flow control devices on wind turbines. They are small tabs situated close to the airfoil trailing edge and normal to the surface. A study to find the most favorable dimension and position to improve the aerodynamic performance of an airfoil is presented herein. Firstly, a parametric study of a GF on a S810 airfoil and an MT on a DU91(2)250 airfoil was carried out. To that end, 2D computational fluid dynamic simulations were performed at Re = 106 based on the airfoil chord length and using RANS equations. The GF and MT design parameters resulting from the computational fluid dynamics (CFD) simulations allowed the sizing of these passive flow control devices based on the airfoil’s aerodynamic performance. In both types of flow control devices, the results showed an increase in the lift-to-drag ratio for all angles of attack studied in the current work. Secondly, from the data obtained by means of CFD simulations, a regular function using the proper orthogonal decomposition (POD) was used to build a reduced order method. In both flow control cases (GFs and MTs), the recursive POD method was able to accurately and very quickly reproduce the computational results with very low computational cost. View Full-Text
Keywords: wind energy; flow control; Gurney flaps; microtabs; proper orthogonal decomposition; reduced order method wind energy; flow control; Gurney flaps; microtabs; proper orthogonal decomposition; reduced order method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Fernandez-Gamiz, U.; Gomez-Mármol, M.; Chacón-Rebollo, T. Computational Modeling of Gurney Flaps and Microtabs by POD Method. Energies 2018, 11, 2091.

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