Calibration of the 7—Equation Transition Model for High Reynolds Flows at Low Mach

The Science of Making Torque from Wind

Colonia, S.^1 ; Leble, V.^1 ; Steijl, R.^1 ; Barakos, G.^1

School of Engineering, University of Glasgow, Glasgow

G12 8QQ, United Kingdom^1

关键词: Calibrated model;    Complex three dimensional flow;    Cross-flow instabilities;    Large scale wind turbines;    Local correlations;    Three-dimensional flow;    Transition modelling;    Turbine applications;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/8/082027/pdf
DOI  :  10.1088/1742-6596/753/8/082027

来源: IOP

【 摘 要 】

The numerical simulation of flows over large-scale wind turbine blades without considering the transition from laminar to fully turbulent flow may result in incorrect estimates of the blade loads and performance. Thanks to its relative simplicity and promising results, the Local-Correlation based Transition Modelling concept represents a valid way to include transitional effects into practical CFD simulations. However, the model involves coefficients that need tuning. In this paper, the γ - equation transition model is assessed and calibrated, for a wide range of Reynolds numbers at low Mach, as needed for wind turbine applications. An aerofoil is used to evaluate the original model and calibrate it; while a large scale wind turbine blade is employed to show that the calibrated model can lead to reliable solutions for complex three-dimensional flows. The calibrated model shows promising results for both two-dimensional and three-dimensional flows, even if cross-flow instabilities are neglected.