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Goyal, J. (author), Sinnige, T. (author), Ferreira, Carlos (author), Avallone, F. (author)This paper studies the effect of operation at non-zero angles of attack on the aerodynamic performance and far-field noise emissions of an isolated propeller operating at positive and negative thrust conditions. To achieve this, scale-resolved lattice-Boltzmann very large eddy simulations coupled with the Ffowcs Williams & Hawkings analogy...conference paper 2023
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di Angelo, Monika (author), Durieux, T. (author), Ferreira, João F. (author), Salzer, Gernot (author)Smart contracts are blockchain programs that often handle valuable assets. Writing secure smart contracts is far from trivial, and any vulnerability may lead to significant financial losses. To support developers in identifying and eliminating vulnerabilities, methods and tools for the automated analysis of smart contracts have been proposed....conference paper 2023
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Pinto Ribeiro, A. (author), Casalino, D. (author), Ferreira, Carlos (author)This paper shows fluid structure interaction simulations of a highly flexible wing at various flow conditions, including flutter regime. This is achieved with two-way time domain coupling of a geometrically exact beam structural model and a 3D free wake panel method, modelling the outer surface of the wing, which allow for non-linear effects of...conference paper 2022
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Ferreira, Joao Dinis (author), Falcao, Gabriel (author), Gomez-Luna, Juan (author), Alser, Mohammed (author), Orosa, Lois (author), Sadrosadati, Mohammad (author), Kim, Jeremie S. (author), Oliveira, Geraldo F. (author), Shahroodi, Taha (author)Data movement between the main memory and the processor is a key contributor to execution time and energy consumption in memory-intensive applications. This data movement bottleneck can be alleviated using Processing-in-Memory (PiM). One category of PiM is Processing-using-Memory (PuM), in which computation takes place inside the memory array...conference paper 2022
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Goyal, J. (author), Sinnige, T. (author), Avallone, F. (author), Ferreira, Carlos (author)Regenerative propellers offer many potential benefits such as improved maneuverability, reduced landing run, and decreased community noise, besides the potential to reduce energy consumption by recovering energy during descent and landing. Since the blade loading in regenerative mode will be opposite to that in the conventional propulsive mode,...conference paper 2021
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LeBlanc, B.P. (author), Ferreira, Carlos (author)Due to advances in numerical modeling and hardware scaling, aspects of Vertical Axis Wind Turbines (VAWTs) can now be studied in greater detail than ever before. Turbine blade pitch has been proposed as a method to control overall turbine loading. A 1.5 meter diameter, 1.5 meter height 2 bladed H-Darrieus VAWT with individual blade pitch...conference paper 2018
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Matias, Ana (author), Carrasco, Ana Rita (author), Loureiro, Carlos (author), Andriolo, Umberto (author), Masselink, Gerd (author), Guerreiro, Martha (author), Pacheco, A (author), McCall, R.T. (author), Ferreira, Óscar (author), Plomaritis, Theocharis A. (author)Overwash hydrodynamics datasets are mixed in quality and scope, being hard to obtain due to fieldwork experimental difficulties. Aiming to overcome such limitations, this work presents accurate fieldwork data on overwash<br/>hydrodynamics, further exploring it to model overwash on a low-lying barrier island. Fieldwork was performed on Barreta...conference paper 2017
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Koppenol, Boy (author), Cheng, Zhengshun (author), Gao, Zhen (author), Ferreira, Carlos (author), Moan, T (author)This paper presents a comparison of two state-of-the-art codes that are capable of modelling floating vertical axis wind turbines (VAWTs) in fully coupled time-domain simulations, being the HAWC2 by DTU and the SIMO-RIFLEX-AC code by NTNU/MARINTEK. The comparative study focusses on the way aerodynamics, hydrodynamics and structural dynamics are...conference paper 2017
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Wang, X. (author), Liu, D. (author), Lahaye, D.J.P. (author), Polinder, H. (author), Ferreira, Jan Abraham (author)The brushless doubly-fed induction machine (DFIM) has great potential as a variable-speed generator for wind turbine applications. This special machine has a richer space-harmonic spectrum due to its special nested-loop rotor construction compared with conventional induction machines. It may result in higher iron losses, higher torque ripple and...conference paper 2017
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Wang, X. (author), Liu, D. (author), Lahaye, D.J.P. (author), Polinder, H. (author), Ferreira, Jan Abraham (author)Permanent-magnet machines with fractional slot concentrated windings are easy to manufacture. Their popularity therefore is steadily increasing. Without a proper design, however, the induced eddy-current losses in the solid rotor get rather high. The modeling and the prediction of eddy-current losses for these machines are thus very important...conference paper 2016
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Liu, D. (author), Polinder, H. (author), Abrahamsen, Asger Bech (author), Ferreira, Jan Abraham (author)Superconducting synchronous generators (SCSGs) are being proposed for 10-MW direct-drive wind turbines, because of their advantages of low weight and compactness. So far, however, there has not been a commonly accepted design philosophy of SCSGs and various possibilities with many tradeoffs remain for study. Partially SCSGs are considered a...conference paper 2016
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Ferreira, J.P. (author), De Breuker, R. (author)This study describes the development of a morphing wing concept for a Portuguese Air Force Unmanned Air Vehicle (UAV), the UAS-30. Nowadays, optimized fuel efficiency is a primary requirement in the aerospace industry, and it can be significantly improved by designing adaptive wings which can change their shape in flight to achieve better...conference paper 2016
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Mackay, L.J. (author), Hailu, T.G. (author), Chandra Mouli, G.R. (author), Ramirez Elizondo, L.M. (author), Ferreira, Jan Abraham (author), Bauer, P. (author)The traditional ac power system is challenged by the increased amount of distributed energy resources. Enormous changes and investments are necessary in order to achieve an ac smart grid capable of coping with the challenges introduced. In dc, solutions seem to be more straightforward since most of the distributed energy sources and most of the...conference paper 2015
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- Bang, D. (author), Jang, G.W. (author), Hwang, S.H. (author), Han, P.W. (author), Kim, J.W. (author), Koo, D.H. (author), Polinder, H. (author), Ferreira, J.A. (author) conference paper 2014
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Van der Geest, M. (author), Wolmarans, J.J. (author), Polinder, H. (author), Ferreira, J.A. (author), Zeilstra, D. (author)High speed fault tolerant permanent magnet machines have strong asynchronous airgap harmonics, making them susceptible to rotor eddy-current losses. These losses can be reduced by using novel high resistivity materials like plastic bonded magnets and carbon fiber reinforced retaining sleeves. This paper examines by numerical studies the...conference paper 2012
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Ferreira, J. (author), Christiaans, H.H.C.M. (author)This paper presents the first observational study of an ongoing research project. The research focuses on ‘teaching conceptual design’ and on the investigation of new teaching methods and strategies. Presently, in the commonly established educational setting, students practice the role of designing during design exercises while being tutored by...conference paper 2012
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Haerens, P. (author), Ciavola, P. (author), Ferreira, O. (author), Van Dongeren, A. (author), Van Koningsveld, M. (author), Bolle, A. (author)Extreme coastal storms have a destructive impact on coastal areas and directly affect people living in the coastal zone, being this emphasized by recent events (e.g. Katrina, Xynthia) which reminded the world of the vulnerability of coastal areas. The economic constraints and the increasing vulnerability of coastal areas (due to sea level rise...conference paper 2012
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Akay, B. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author), Herraez, I. (author)This paper explores the evolution of radial flow in a Horizontal Axis Wind Turbine (HAWT) blade root region. The radial flow is analyzed in the potential flow and viscous flow regions. An experiment carried out by means of stereo Particle Image Velocimetry to measure the velocity field produced by a HAWT blade. While the radial flow in the...conference paper 2012
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Weber, J.H. (author), Schouhamer Immink, K.A. (author), Ferreira, H.C. (author)Knuth's celebrated balancing method consists of inverting the first z bits in a binary information sequence, such that the resulting sequence has as many ones as zeroes, and communicating the index z to the receiver through a short balanced prefix. In the proposed method, Knuth's scheme is extended with error-correcting capabilities, where it is...conference paper 2011
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Akay, B. (author), Micallef, D. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author)This paper sets out to describe the measurements and computations to construct three components of velocity field around the blade. The primary aim of the measurements was to gain insight into the physics of the flow field produced by a horizontal axis wind turbine-HAWT blade. Stereo Particle Image Velocimetry experiments were performed on a two...conference paper 2011
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