Simulations of transition and separation past a wind-turbine airfoil near stall

Wenyao Cui, Zhixiang Xiao and Xiangjiang Yuan

Energy, 2020, vol. 205, issue C

Abstract: The transition has an important effect on the aerodynamic performance and energy consumption of the wind turbine. When the angle of attack is sufficiently large, separation often occurs with transition near the leading edge. To simulate the transition and separation simultaneously, a new improved delayed detached eddy simulation (IDDES) method based on the three-equation k-ω-γ transition/turbulence integrated model (IDDES-Tr) is developed and applied to simulate the attached transition and resolve the separation past a wind-turbine airfoil. The original IDDES based on the full turbulence model (IDDES-FT) is also used for comparison with the available measurements and some LES-type simulations with very dense grids. From the numerical results, both can successfully resolve the small-scale structures near the trailing edge. In addition, IDDES-Tr can simulate the laminar separation bubble and boundary layer transition near the leading edge, whereas IDDES-FT fails. Thus, the mean aerodynamics by IDDES-Tr are more accurate than IDDES-FT. Furthermore, owing to the more accurate development of the boundary layer accounting for the transition effect, IDDES-Tr also improves the simulation capability of velocity and Reynolds shear stresses.

Keywords: Boundary layer transition; Separation; IDDES; Three-equation k-ω-γ transition model (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:205:y:2020:i:c:s0360544220311105

DOI: 10.1016/j.energy.2020.118003

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