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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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Ferreira, M. (author), Coelho, C. (author), Silva, P.A. (author)Barra-Vagueira coastal stretch, located downdrift of the Aveiro Harbour, NW coast of Portugal, is anerosion hotspot, presenting,in the last 50 years,erosion rates that reached 8m/year(Santoset al.,2014).Thiscoast is subject to a very energetic wave climate, inducing a net littoral transport from North to South that reaches valuesaround 106m3...conference paper 2021
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Ferreira, A.M. (author), Garzon, J.L. (author), Ferreira, Ó. (author), Fortes, C.J.E.M. (author), Reis, M.T. (author)Low-lying coastal areas can be very vulnerable to extreme storms inducing overtopping and flood events with severe socioeconomic consequences. Also, the associated risk is expected to increase due to sea level rise and coastal population growth. Under this threat, early warning systems (EWS) are a crucial tool for coastal planning and management...conference paper 2021
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Phung, Quoc Tri (author), Seetharam, Suresh .C. (author), Ferreira, Eduardo (author), Govaerts, Joan (author), Hendrix, Katrien (author), Valcke, Elie (author)This paper presents an extension of an existing phenomenological model for predicting the evolution of hydration heat of a cemented waste form. The cemented waste form is essentially a mixture of blended cement and homogeneous low- and intermediate-level liquid (simulant) radioactive waste (sludge). The motivation stems from the fact that the...conference paper 2021
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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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- Manoj Mandru, Prabu Sai (author), Leuthold, Rachel (author), Schmehl, Roland (author), Ferreira, Carlos (author) conference paper 2017
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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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Katsigiannis, G. (author), Schweiger, H.F. (author), Ferreira, P. (author), Fuentes, R. (author)This paper focuses on the derivation of design prop loads for supported excavations in stiff clay with increasing excavation depth and number of prop levels. For multi-propped walls there are a number of empirical graphs to obtain the design prop forces. CIRIA C517 (Twine & Roscoe, 1999) enhancing Terzaghi & Peck's work (Terzaghi & Peck (1967)...conference paper 2015
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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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Mateus, L. (author), Ferreira, V. (author)In this paper we describe an experience undertaken in the Faculty of Architecture of Technical University of Lisbon, concerning the introduction of a 3D Digitization course in the frame of the PhD doctorate program in Architecture and in the frame of the Masters programs in Architecture, Urbanism and Design.We start by describing the...conference paper 2013