Searched for: author:"Simao Ferreira, C.J."
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de Tavernier, D.A.M. (author), Simao Ferreira, C.J. (author), Li, A. (author), Paulsen, U. S. (author), Madsen, H. A. (author)
Vertical-axis wind turbines (VAWTs) in double-rotor configuration, meaning two rotors in close proximity, have the ability to enhance the power performance. In this study, we work towards the understanding of vertical-axis wind turbines in double-rotor configuration. Numerical simulations are performed to gain insight in the physics behind...
journal article 2018
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Baldacchino, D. (author), Simao Ferreira, C.J. (author), de Tavernier, D.A.M. (author), Timmer, W.A. (author), van Bussel, G.J.W. (author)
Passive vane-type vortex generators (VGs) are commonly used on wind turbine blades to mitigate the effects of flow separation. However, significant uncertainty surrounds VG design guidelines. Understanding the influence of VG parameters on airfoil performance requires a systematic approach targeting wind energy-specific airfoils. Thus, the 30...
journal article 2018
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Leblanc, B.P. (author), de la Garza Cuevas, R. (author), Simao Ferreira, C.J. (author)
Research into the Vertical Axis Wind Turbine (VAWT) has been progressing over the last few years due to<br/>the large shift in design constraints for large floating offshore wind turbines by leveraging tools and experience<br/>from research beginning in the 1970s and lasting until the HAWT established market dominance in the 1990s. The beginning...
abstract 2017
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Berdowski, T.J. (author), Simao Ferreira, C.J. (author), van Zuijlen, A.H. (author), van Bussel, G.J.W. (author)
A PhD project is being carried out on the topic of far-wake aerodynamics of Horizontal Axis Wind Turbines (HAWTs) in yawed conditions, which has a large relevance for wind farm design and optimization. Characteristic for a turbine in yaw are the inherent unsteady and non-uniform rotor loading, and the typical wake deflection and strong three...
abstract 2017
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Ragni, D. (author), Simao Ferreira, C.J. (author)
A 3D stall-cell flow-field has been studied in a 4.8 aspect-ratio wing obtained by linear extrusion of a laminar NACA64-418 airfoil profile. The span-wise change in the velocity and pressure distribution along the wing has been quantified with respect to the development of cellular structures from 8◦ to 20◦ angle of attack. Oil-flow...
journal article 2017
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Lignarolo, L. (author), Ragni, D. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author)
The actuator disc (AD) model is commonly used to simplify the simulation of horizontal-axis wind-turbine aerodynamics. The limitations of this approach in reproducing the wake losses in wind farm simulations have been proven by a previous research. The present study is aimed at providing an experimental analysis of the near-wake turbulent flow...
journal article 2016
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Simao Ferreira, C.J. (author), Gonzalez, A. (author), Baldacchino, D. (author), Aparicio, M. (author), Gomez, S (author), Munduate, X. (author), Garcia, N. R. (author), Sørensen, J. N. (author), Jost, E. (author), Knecht, S. (author), Lutz, T. (author), Chassapogiannis, P. (author), Diakakis, K. (author), Papadakis, G. (author), Voutsinas, S. (author), Prospathopoulos, J. (author), Gillebaart, T. (author), van Zuijlen, A.H. (author)
The FP7 AdVanced Aerodynamic Tools for lArge Rotors - Avatar project aims to develop and validate advanced aerodynamic models, to be used in integral design codes for the next generation of large scale wind turbines (10-20MW). One of the approaches towards reaching rotors for 10-20MW size is the application of flow control devices, such as...
journal article 2016
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Micallef, D. (author), Sant, Tonio (author), Simao Ferreira, C.J. (author)
The performance of a wind turbine located above a cubic building is not well understood. This issue is of fundamental importance for the design of small scale wind turbines. One variable which is of particular importance in this respect is the turbine height above roof level. In this work, the power performance of a small wind turbine is...
journal article 2016
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Sørensen, Niels N. (author), Méndez, B. (author), Muñoz, A. (author), Sieros, G. (author), Jost, E. (author), Lutz, T. (author), Papadakis, G. (author), Voutsinas, S. (author), Barakos, G. N. (author), Colonia, S. (author), Baldacchino, D. (author), Veira-Baptista, C.F. (author), Simao Ferreira, C.J. (author)
The current paper presents the effort, in the EU AVATAR project, to establish the necessary requirements to obtain consistent lift over drag ratios among seven CFD codes. The flow around a 2D airfoil case is studied, for both transitional and fully turbulent conditions at Reynolds numbers of 3 × 10<sup>6</sup> and 15 × 10<sup>6</sup>. The...
journal article 2016
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Berdowski, T.J. (author), Walther, J. (author), Simao Ferreira, C.J. (author), Meng, F. (author)
In the current paper, a method for deriving the analytical expressions for the velocity and vortex stretching terms as a function of the spherical multipole expansion approximation of the vector potential is presented. These terms are essential in the context of 3D Lagrangian vortex particle methods combined with fast summation techniques. The...
journal article 2016
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Yu, W. (author), Hong, V.W. (author), Simao Ferreira, C.J. (author), van Kuik, G.A.M. (author)
The state of the art engineering dynamic in ow models of Pitt-Peters, ¬ye and ECN have been used to correct Blade Element Momentum theory for unsteady load prediction of a wind turbine for two decades. However, their accuracy is unknown. This paper is to benchmark the performance of these engineering models by experimental and numerical methods....
journal article 2016
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Berdowski, T.J. (author), Simao Ferreira, C.J. (author), Walther, J. (author)
The application of a 3-dimensional Lagrangian vortex particle method has been assessed for modelling the near-wake of an axisymmetrical actuator disc and 3-bladed horizontal axis wind turbine with prescribed circulation from the MEXICO (Model EXperiments In COntrolled conditions) experiment. The method was developed in the framework of the open-...
journal article 2016
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Baldacchino, D. (author), Simao Ferreira, C.J. (author), Ragni, D. (author), van Bussel, G.J.W. (author)
In this work, we present a simple inviscid point vortex model to study the dynamics of asymmetric vortex rows, as might appear behind misaligned vortex generator vanes. Starting from the existing solution of the in_nite vortex cascade, a numerical model of four base-vortices is chosen to represent two primary counter-rotating vortex pairs and...
journal article 2016
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Baldacchino, D. (author), M Manolesos, M. (author), Simao Ferreira, C.J. (author), Gonzalez Salcedo, A (author), Aparicio, M. (author), Chaviaropoulos, T. (author), Diakakis, K. (author), Florentie, L. (author), Garcia, M. (author), Papadakis, G (author), Sorensen, N.N. (author), Timmer, W.A. (author), Troldborg, N. (author), Voutsinas, S. (author), van Zuijlen, A.H. (author)
Experimental results and complimentary computations for airfoils with vortex generators are compared in this paper, as part of an e_ort within the AVATAR project to develop tools for wind turbine blade control devices. Measurements from two airfoils equipped with passive vortex generators, a 30% thick DU97W300 and an 18% thick NTUA T18 have been...
journal article 2016
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Lignarolo, L. (author), Ragni, D. (author), Simao Ferreira, C.J. (author), van Bussel, G.J.W. (author)
The present paper is the summary of 3 years of research on the wake aerodynamics of horizontal axis wind turbine at Delft University of Technology, the Netherlands. In particular, the main results and the conclusions of two experimental campaigns are collected. The underlying research question is: how do the near-wake turbulent flow structures...
conference paper 2015
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Baldacchino, D. (author), Ragni, D. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author)
In this work, the measured modulated integral boundary layer (IBL) characteristics of low-profile vortex generators (VGs) are used to validate new developments in a viscousinviscid interaction code which is modified to incorporate the effect of the passive mixing devices. The motivations are laid out and sample validation data is presented...
conference paper 2015
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Paulsen, US (author), Borg, M. (author), Madsen, HA (author), Pedersen, TF (author), Hattel, J (author), Ritchie, E. (author), Simao Ferreira, C.J. (author), Svendsen, H. (author), Berthelsen, P.A. (author), Smadja, C. (author)
DeepWind has been presented as a novel floating offshore wind turbine concept with cost reduction potentials. Twelve international partners developed a Darrieus type floating turbine with new materials and technologies for deep-sea offshore environment. This paper summarizes results of the 5 MW DeepWind conceptual design. The concept was...
journal article 2015
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Micallef, D. (author), Akay, B. (author), Simao Ferreira, C.J. (author), Sant, T. (author), Van Bussel, G.J.W. (author)
The tip vortex of a wind turbine rotor blade originates as a result of a complex distribution of vorticity along the blade tip thickness. While the tip vortex evolution was extensively studied previously in other work, the mechanism of the initiation of the tip vorticity in a 3D rotating environment is still somewhat obscured due to lack of...
journal article 2014
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Yu, W. (author), Simao Ferreira, C.J. (author), van Kuik, G.A.M. (author)
Smart rotor emerges as an innovation technique to reduce the impact of dynamic loading on wind turbines. Local movements of distributed aerodynamic devices will enhance the non-uniformity and dynamic effects of loading, which will challenge the applicability of the blade element momentum theory (BEM) for smart rotor control design due to its...
conference paper 2014
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Akay, B. (author), Micallef, D. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author)
In this study, the effect of the parameters playing a role in the root flow behavior of HAWT are only partly understood. To better reveal the root flow properties, this study presents the progression of HAWT blade root flow at two different blade geometries and at two different tip speed ratios. The effects of the geometry and the tip speed...
journal article 2014
Searched for: author:"Simao Ferreira, C.J."
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