Author: Limin Kuang, Jie Su, Yaoran Chen, Zhaolong Han, Dai Zhou, Yongsheng Zhao, Zhiyu Jiang, Yan BaoPublication: Energy Science & EngineeringYear Published: 2019 With the development of urbanization and the application of renewable energy, wind turbine is becoming an important approach for wind energy reservation and utilization. This study provides a numerical investigation on understanding…
Author: Mahdi Abkar and John DabiriPublication: Journal of TurbulenceYear Published: 2017 Large eddy simulation (LES) is coupled with a turbine model to study the structure of the wake behind a vertical-axis wind turbine (VAWT). In the simulations, a tuning-free anisotropic minimum dissipation model is used to parameterise the subfilter stress tensor, while the turbine-induced forces…
Author: Victor Mendoza, Anders GoudePublication: J. Physics: Conference SeriesYear Published: 2017 The current trend of the wind energy industry aims for large scale turbines installed in wind farms. This brings a renewed interest in vertical axis wind turbines (VAWTs) since they have several advantages over the traditional Horizontal Axis Wind Turbines (HAWTs) for mitigating the…
Author: Andre Chang, Peter Dewey, Antony Jameson, Chunlei Liang, Alexander SmitsPublication: Stanford UniversityYear Published: 2011 The flow over a pair of counter-rotating cylinders is investigated numerically and experimentally. It is demonstrated that it is possible to suppress unsteady vortex shedding for gap sizes from one to five cylinder diameters, at Reynolds numbers from 100 to…
Author: Lydia Ruiz, Robert Whittlesey, John DabiriPublication: Cambridge UniversityYear Published: 2010 It has been previously suggested that the generation of coherent vortical structures in the near-wake of a self-propelled vehicle can improve its propulsive efficiency by manipulating the local pressure field and entrainment kinematics. This paper investigates these unsteady mechanisms analytically and in experiments. A…
Author: Daniel Araya, Tim Colonius and John DabiriPublication: J. Fluid Mech.Year Published: 2017 We present experimental data to demonstrate that the far wake of a vertical-axis wind turbine (VAWT) exhibits features that are quantitatively similar to that of a circular cylinder with the same aspect ratio. For a fixed Reynolds number (Re ≈ 0.8 ×…
Author: Kristian DixonPublication: Delft University of Tech.Year Published: 2008 A 3D unsteady multi-body panel method is developed that can model arbitrary geometries. The method has been specifically designed so that it can handle the blade-wake interactions and viscous wake effects that are important for modelling a vertical axis wind turbine (VAWT). A systematic validation and…
Author: Matthieu Duponcheel, Denis-Gabriel Caprace, Gregoire Winckelmans, Philippe ChatelainPublication: Universite Catholique de LouvainYear Published: 2016 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…
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: 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…