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THREE-DIMENSIONAL AERODYNAMIC ANALYSIS OF A DARRIEUS WIND TURBINE BLADE USING COMPUTATIONAL FLUID DYNAMICS AND LIFTING LINE THEORY

[+] Author and Article Information
Francesco Balduzzi

Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139, Firenze, Italy
balduzzi@vega.de.unifi.it

David Marten

Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Müller-Breslau-Str. 8, 10623, Berlin, Germany
david.marten@tu-berlin.de

Alessandro Bianchini

Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139, Firenze, Italy
bianchini@vega.de.unifi.it

Jernej Drofelnik

School of Engineering, University of Glasgow, James Watt Building South, University Avenue, G12 8QQ Glasgow, UK
j.drofelnik.1@research.gla.ac.uk

Lorenzo Ferrari

Department of Energy, Systems, Territory and Construction Engineering, University of Pisa, Largo Lucio Lazzarino, 56122, Pisa, Italy
lorenzo.ferrari@unipi.it

Campobasso Michele

Campobasso Department of Engineering, Lancaster University, Gillow Avenue, LA1 4YW Lancaster, UK
m.s.campobasso@lancaster.ac.uk

Georgios Pechlivanoglou

Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Müller-Breslau-Str. 8, 10623, Berlin, Germany
george@pechlivanoglou.com

Christian Navid Nayeri

Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Müller-Breslau-Str. 8, 10623, Berlin, Germany
christian.nayeri@tu-berlin.de

Giovanni Ferrara

Department of Industrial Engineering, University of Florence, Via di Santa Marta 3, 50139, Firenze, Italy
giovanni.ferrara@unifi.it

Christian Oliver Paschereit

Paschereit Chair of Fluid Dynamics, Hermann-Föttinger-Institut, Technische Universität Berlin, Müller-Breslau-Str. 8, 10623, Berlin, Germany
oliver.paschereit@tu-berlin.de

1Corresponding author.

ASME doi:10.1115/1.4037750 History: Received July 05, 2017; Revised July 19, 2017

Abstract

Due to the rapid progress in high-performance computing and the availability of increasingly large computational resources, Navier-Stokes computational fluid dynamics (CFD) now offers a cost-effective, versatile and accurate means to improve the understanding of the unsteady aerodynamics of Darrieus wind turbines and deliver more efficient designs. In particular, the possibility of determining a fully resolved flow field past the blades by means of CFD offers the opportunity to both further understand the physics underlying the turbine fluid dynamics and to use this knowledge to validate lower-order models. In this context, highly spatially and temporally refined timedependent three-dimensional Navier-Stokes simulations were carried out using more than 16,000 processor cores per simulation on an IBM BG/Q cluster in order to investigate thoroughly the three-dimensional unsteady aerodynamics of a single blade in Darrieus-like motion. Particular attention was payed to tip losses, dynamic stall, and blade/wake interaction. CFD results are compared with those obtained with an open source code based on the Lifting Line Free Vortex Wake Model (LLFVW). At present, this approach is the most refined method among the "lower-fidelity" models and, as the wake is explicitly resolved in contrast to BEM-based methods, LLFVW analyses provide three-dimensional flow solutions. Extended comparisons between the two approaches are presented and a critical analysis is carried out to identify the benefits and drawbacks of the two approaches.

Copyright (c) 2017 by ASME
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