Author: Akiyoshi Iida, Keiichi Kato and Akisato MizunoPublication: Austrailian Fluid Mechanics Conf.Year Published: 2007 The goal of this investigation is to develop high performance Vertical Axis Wind Turbines (hereafter VAWT) for clean energy supply systems. For this purpose, we attempted to simulate flow around a VAWT with Large Eddy Simulation (LES). Since the angles of…
Author: Clara O’Farrell and John O. DabiriPublication: Cambridge UniversityYear Published: 2014 Inviscid models for vortex rings and dipoles are constructed using nested patches of vorticity. These models constitute more realistic approximations to experimental vortex rings and dipoles than the single contour models of Norbury and Pierrehumbert, and nested contour dynamics algorithms allow their simulation with…
Author: G. Tescione, D. Ragni, C. He, C.J. Simao Ferreira, G.J.W van BusselPublication: Renewable EnergyYear Published: 2014 The development of the near wake of a vertical axis wind turbine is investigated by stereoscopic particle image velocimetry. The experiments are conducted in an open-jet wind tunnel on an H-shaped rotor, operated at a tip speed ratio…
Author: Nathaniel Wei, Ian Brownstein, J.L. Cardona, M.F. Howland, John DabiriPublication: J. Fluid Mech.Year Published: 2020 To design and optimize arrays of vertical-axis wind turbines (VAWTs) for maximal power density and minimal wake losses, a careful consideration of the inherently three-dimensional structure of the wakes of these turbines in real operating conditions is needed. Accordingly,…
Author: H.F. Lam, H.Y. PengPublication: EnergyYear Published: 2017 Increasing the efficiency of individual vertical-axis wind turbines (VAWTs) has been the subject of much research. However, wind farms that comprise individual VAWTs are not necessarily the most efficient configuration in accordance with VAWTs’ signature wake pattern. This study aims to identify efficient array configurations and thereby…
Author: Sayed Hossein Hezeveh, Elie Bou-ZeidPublication: Physical Review FluidsYear Published: 2018 Vertical-axis wind turbines (VAWTs) are the subject of renewed interest due to the potential for higher power generation per unit land used, as well as their lower center of mass (the generator is at the bottom of tower), which renders them favorable for offshore…
Author: aniel Araya, Anna. Craig, Matthias Kinzel, and John DabiriPublication: J. Renewable and Sustainable EnergyYear Published: 2014 We develop and characterize a low-order model of the mean flow through an array of vertical-axis wind turbines (VAWTs), consisting of a uniform flow and pairs of potential sources and sinks to represent each VAWT. The source and…
Author: Y. Bazilevs, A. Korobenko, X. Deng, J. Yan, M. Kinzel, John DabiriPublication: J. Appl. Mech.Year Published: 2014 Full-scale, 3D, time-dependent aerodynamics and fluid–structure interaction (FSI) simulations of a Darrieus-type vertical-axis wind turbine (VAWT) are presented. A structural model of the Windspire VAWT (Windspire energy, http://www.windspireenergy.com/) is developed, which makes use of the recently proposed…
Author: Sanjay Mittal, Bhaskar KumarPublication: J. Fluid Mech.Year Published: 2002 The fatigue analysis of a wind turbine component typically uses representative samples of cyclic loads to determine lifetime loads. In this paper, several techniques currently in use are compared to one another based on fatigue life analyses. The generalized Weibull fitting technique is used to…
Author: Dan Henningson, Martin BerggrenPublication: KTHYear Published: 2005 These lecture notes has evolved from a CFD course (5C1212) and a Fluid Mechanics course (5C1214) at the department of Mechanics and the department of Numerical Analysis and Computer Science (NADA) at KTH. Erik Stalberg and Ori Levin has typed most of the LATEX formulas and has…