- document
-
Mendoza, Victor (author), Bachant, Peter (author), Ferreira, Carlos (author), Goude, Anders (author)In the present work, the near-wake generated for a vertical axis wind turbine (VAWT) was simulated using an actuator line model (ALM) in order to validate and evaluate its accuracy. The sensitivity of the model to the variation of the spatial and temporal discretization was studied and showed a bigger response to the variation in the mesh size...journal article 2019
- document
-
Araújo, A. L. (author), MacIel, R. P. (author), Dornelas, R. G.F. (author), Varjas, D. (author), Ferreira, G. J. (author)Dirac-like Hamiltonians, linear in momentum k, describe the low-energy physics of a large set of novel materials, including graphene, topological insulators, and Weyl fermions. We show here that the inclusion of a minimal k2 Wilson's mass correction improves the models and allows for systematic derivations of appropriate boundary conditions...journal article 2019
- document
-
Spectral analysis of New MEXICO standstill measurements to investigate vortex shedding in deep stallKhan, Muhammad A. (author), Ferreira, Carlos (author), Schepers, J.G. (author), Sørensen, Niels N. (author)Spectral analysis was performed on the time series data computed from pressure measurements on the New MEXICO (Model Rotor Experiments under Controlled Conditions) rotor in standstill conditions. As a priori, 3D airfoil polars were recreated from standstill measurements and compared against 2D airfoil polars and flat plate theory results to...journal article 2019
- document
-
Moors, Gunther (author), Kassapoglou, C. (author), de Almeida, Sergio Frascino Müller (author), Ferreira, Clovis Augusto Eça (author)A process to efficiently design composite wing boxes is presented. It uses analytical and semi-empirical equations for failure modes such as material strength, plate buckling, stiffener column buckling and stiffener flange or web crippling. Laminate layups for the different components are selected in accordance with basic engineering rules...journal article 2019
- document
-
Ferreira, Débora (author), Silva, Ana P. (author), Luzia de Nobrega, F. (author), Martins, Ivone M. (author), Barbosa-Matos, Catarina (author), Granja, Sara (author), Martins, Sandra F. (author), Baltazar, Fátima (author), Rodrigues, Ligia R. (author)Colorectal cancer is frequently diagnosed at an advanced stage due to the absence of early clinical indicators. Hence, the identification of new targeting molecules is crucial for an early detection and development of targeted therapies. This study aimed to identify and characterize novel peptides specific for the colorectal cancer cell line...journal article 2019
- document
-
Hou, F. (author), Wang, W. (author), Lin, Tingyu (author), Cao, Liqiang (author), Zhang, Kouchi (author), Ferreira, Jan Abraham (author)In this paper, a novel fan-out panel-level printed circuit board (PCB) embedded package technology for silicon carbide (SiC) MOSFET power module is presented to address parasitic inductances, heat dissipation, and reliability issues that are inherent with aluminum wires used in conventional packaging scheme. To withstand high temperature...journal article 2019
- document
-
Shen, Y. (author), Lindenbergh, R.C. (author), Wang, Jinguo (author), Ferreira, Vagner G. (author)Bricks are the vital component of most masonry structures. Their maintenance is critical to the protection of masonry buildings. Terrestrial Light Detection and Ranging (TLidar) systems provide massive point cloud data in an accurate and fast way. TLidar enables us to sample and store the state of a brick surface in a practical way. This...journal article 2018
- document
-
Vimalakanthan, K. (author), Schepers, J.G. (author), Shen, W. Z. (author), Rahimi, H. (author), Micallef, D. (author), Ferreira, Carlos (author), Jost, E. (author), Klein, L. (author)As part of the AVATAR and Mexnext projects, this study compares several methods used to derive lifting line variables from CFD simulations of the MEXICO rotor in yawed inflow. The results from six partners within the AVATAR/Mexnext consortium using five different methods of extraction were compared. Overall comparison of the induced...journal article 2018
- document
-
LeBlanc, B.P. (author), Ferreira, Carlos (author)Large floating offshore wind turbines are beginning to show promise as a technology with several pilot projects being completed in recent years with more on the near horizon. Due to the complexities of the floating configuration there are substantial costs associated with the platform and mooring systems for these types of deep water machines...journal article 2018
- document
-
Schepers, J.G. (author), Boorsma, K. (author), Sorensen, N. (author), Voutsinas, V. (author), Sieros, G. (author), Rahimi, H. (author), Heisselmann, H. (author), Jost, E. (author), Lutz, T. (author), Maeder, T. (author), Gonzalez, A. (author), Ferreira, Carlos (author), Stoevesandt, B. (author), Barakos, G. (author), Lampropoulos, N. (author), Croce, A. (author), Madsen, J. (author)This paper presents final results from the EU project AVATAR in which aerodynamic models are improved and validated for wind turbines on a scale of 10 MW and more. Special attention is paid to the improvement of low fidelity engineering (BEM based) models with higher fidelity (CFD) models but also with intermediate fidelity free vortex wake ...journal article 2018
- document
-
De Tavernier, D. (author), Ferreira, Carlos (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
- document
-
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
- document
-
De Tavernier, D. (author), Baldacchino, D. (author), Ferreira, Carlos (author)To assess and optimize vortex generators (VGs) for flow separation control, the effect of these devices should be modelled in a cost and time efficient way. Therefore, it is of interest to extend integral boundary layer models to analyse the effect of VGs on airfoil performance. In this work, the turbulent boundary layer formulation is...journal article 2018
- document
-
Shipurkar, U. (author), Lyrakis, E. (author), Ma, Ke (author), Polinder, H. (author), Ferreira, Jan Abraham (author)The power electronic converter, especially the power semiconductor, is a major contributor to the failure rates of the wind turbine drivetrain. As the temperature is a major driving factor behind the failure mechanisms of these power semiconductors the choice of topology and switching strategy can have a significant effect on the reliability...journal article 2018
- document
-
Baldacchino, D. (author), Ferreira, Carlos (author), De Tavernier, D. (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
- document
-
Koppejan, V.W. (author), Ferreira, Guilherme (author), Lin, Dong Qiang (author), Ottens, M. (author)Expanded bed adsorption (EBA) emerged in the early 1990s in an attempt to integrate the clarification, capture and initial product concentration/purification process. Several mathematical models have been put forward to describe its operation. However, none of the models developed specifically for EBA allows simultaneous prediction of bed...journal article 2018
- document
-
Huijs, Fons (author), Vlasveld, Ebert (author), Gormand, Maël (author), Savenije, F.J. (author), Caboni, Marco (author), LeBlanc, B.P. (author), Ferreira, Carlos (author), Lindenburg, Koert (author)A semi-submersible Tri-Floater has been designed to support a 6 MW vertical axis wind turbine (VAWT) with active blade pitch control. Due to the low centre of gravity and large allowable floater tilt angle, a relatively small floater can be used to support a VAWT. Coupled simulations including hydrodynamics, mooring system, aerodynamics and...journal article 2018
- document
-
Shen, Y. (author), Wang, Jinguo (author), Lindenbergh, R.C. (author), Hofland, Bas (author), Ferreira, Vagner G. (author)The use of a terrestrial laser scanner is examined to measure the changes of rock slopes subject to a wave attack test. Real scenarios are simulated in a water flume facility using a wave attack experiment representing a storm of 3000 waves. The stability of two rock slopes of different steepness was evaluated under the set conditions. For...journal article 2018
- document
-
Shipurkar, U. (author), Dong, J. (author), Polinder, H. (author), Ferreira, Jan Abraham (author)Modularity is promising from a view to increasing turbine availability through fault tolerant operation as well as reduced downtimes, especially for offshore wind turbines. This paper focuses on a quantitative analysis of large scale (or extreme) modularity in power electronic converters of wind turbine generator systems. It uses mathematical...journal article 2018
- document
- Manoj Mandru, Prabu Sai (author), Leuthold, Rachel (author), Schmehl, Roland (author), Ferreira, Carlos (author) conference paper 2017