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http://dx.doi.org/10.5407/JKSV.2016.14.3.028

Investigation of wake characteristics in turbulence of stable atmospheric boundary layer  

Na, Jisung (Department of Mechanical Engineering, Yonsei Univ.)
Ko, Seungchul (Department of Mechanical Engineering, Yonsei Univ.)
Lee, Joon Sang (Department of Mechanical Engineering, Yonsei University)
Publication Information
Journal of the Korean Society of Visualization / v.14, no.3, 2016 , pp. 28-31 More about this Journal
Abstract
In this study, we investigate the wake characteristics in two cases which are laminar inflow and turbulent inflow. To solve the flow with wind turbines and its wake, we use large eddy simulation (LES) technique with actuator line method (ALM) and turbulent inflow of Turbsim. Turbulent inflow which contains the characteristic of the stable atmospheric boundary layer is used. We perform the quantitative analysis of velocity deficit and turbulence intensity in two cases. Time series of velocity deficit at the first, the second column in two cases are compared to observe the performance of wind turbine. The performance in the first column in laminar inflow is overestimated compared to that in turbulent inflow. And we observe that wake in the case with turbulent inflow drive to the span-wise direction and wake recovery in turbulent inflow is more effective. In quadrant analysis of Reynolds stress, the ejection and the sweep motion in turbulent inflow case are bigger than those in laminar inflow case.
Keywords
Wind turbine; Turbulent inflow; Stable atmospheric boundary layer; Wake characteristics;
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