Transient rotor inflow using a time-accurate free-vortex wake model

2001 ◽  
Author(s):  
Mahendra Bhagwat ◽  
J. Leishman
Keyword(s):  
Vortex Wake ◽  
Free Vortex ◽  
Wake Model

Benchmarking of a Free Vortex Wake Model for Prediction of Wake Interactions

2019 ◽  
Vol 136 ◽  
pp. 607-620 ◽  
Author(s):  
Kelsey Shaler ◽  
Krista M. Kecskemety ◽  
Jack J. McNamara
Keyword(s):  
Vortex Wake ◽  
Free Vortex ◽  
Wake Interactions ◽  
Wake Model

Modeling Dynamic Stall for a Free Vortex Wake Model

2015 ◽  
Vol 39 (6) ◽  
pp. 675-691 ◽  
Author(s):  
Evan M. Gaertner ◽  
Matthew A. Lackner
Keyword(s):  
Dynamic Stall ◽  
Vortex Wake ◽  
Free Vortex ◽  
Wake Model

scholarly journals Aeroelastic loads on a 10 MW turbine exposed to extreme events selected from a year-long large-eddy simulation over the North Sea

2021 ◽  
Vol 6 (4) ◽  
pp. 983-996
Author(s):  
Gerard Schepers ◽  
Pim van Dorp ◽  
Remco Verzijlbergh ◽  
Peter Baas ◽  
Harmen Jonker
Keyword(s):  
Large Eddy Simulation ◽  
North Sea ◽  
Extreme Events ◽  
Vortex Wake ◽  
Free Vortex ◽  
Eddy Simulation ◽  
The North ◽  
Large Eddy ◽  
The North Sea ◽  
Wake Model

Abstract. In this article the aeroelastic loads on a 10 MW turbine in response to extreme events (low-level jet, shear, veer and turbulence intensity) selected from a year-long large-eddy simulation (LES) on a site at the North Sea are evaluated. These events are generated with a high-fidelity LES wind model and fed into an aeroelastic tool using two different aerodynamic models: a model based on blade element momentum (BEM) and a free vortex wake model. Then the aeroelastic loads are calculated and compared with the loads from the IEC standards. It was found that the loads from all these events remain within those of the IEC design loads. Moreover, the accuracy of BEM-based methods for modelling such wind conditions showed a considerable overprediction compared to the free vortex wake model for the events with extreme shear and/or veer.

Aerodynamic Analysis and Optimization of Wind Turbines Based on Full Free Vortex Wake Model

2013 ◽  
Author(s):  
Xiancheng Song ◽  
Jiang Chen ◽  
Gang Du ◽  
Lucheng Ji
Keyword(s):  
Wind Turbine ◽  
Series Representation ◽  
Vortex Sheet ◽  
Vortex Wake ◽  
Thrust Coefficient ◽  
Free Vortex ◽  
Aerodynamic Analysis ◽  
Multipole Methods ◽  
Wake Model ◽  
Free Wake

The aerodynamic analysis and optimization of wind turbine based on a full free vortex wake model is presented. Instead of a simplification of the vortex wake structure, this model predict an adequate free-wake extension which can accurately take into account the profound influence of vortex sheet downstream on the aerodynamic performance of wind turbine. The problem that the model suffers from high computational costs is solved by combining the Fast Multipole Methods (FMM) for an efficient evaluation of the Biot–Savart law with the parallel processing. The model is applied to the aerodynamic analysis of wind turbine and a stable convergent numerical solution is achieved using the pseudo-implicit technique (steady) and predictor-corrector PC2B scheme (unsteady). The optimization based on this analysis is also efficiently carried out using a Fourier series representation of the bound circulation as optimization variables, using a given thrust coefficient as a constraint. The chord and twist distributions that completely define the geometry are produced from the obtained optimal bound circulation distribution. The optimization is capable of quickly finding an optimum design using a few optimization variables. The validations of presented methods are performed through comparisons with the National Renewable Energy Laboratory (NREL) wind turbine experiment.

scholarly journals A Simplified Free Vortex Wake Model of Wind Turbines for Axial Steady Conditions

2018 ◽  
Vol 8 (6) ◽  
pp. 866 ◽  
Author(s):  
Bofeng Xu ◽  
Tongguang Wang ◽  
Yue Yuan ◽  
Zhenzhou Zhao ◽  
Haoming Liu
Keyword(s):  
Wind Turbines ◽  
Vortex Wake ◽  
Free Vortex ◽  
Wake Model
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