Title: Large-Eddy Simulation of a wind turbine using a Filtered Actuator Line Model

Journal Article · · Journal of Wind Engineering and Industrial Aerodynamics

When dealing with multirotor devices such as quadcopters or wind farms, the cost of blade-resolved large-eddy simulation (LES) becomes prohibitive. Combining LES with a family of lower-fidelity models, called actuator line models (ALMs), has grown in popularity in the past decade. ALM replaces full blade resolution with an array of actuator points or lines parameterized by aerodynamic lift/drag polar plots along the blades. Body forces computed based on these actuator points are then projected onto the LES flow mesh, mimicking the effect of rotating blades on the flow. However, the optimal projection radius and the associated LES grid size is often too restrictive for multirotor simulations. Recently, a new tip-correction-based filtered ALM (F-ALM) was proposed by Martinez-Tossas and Meneveau (2019), which allows coarser-than-optimal grids by avoiding the associated overprediction of thrust. In this work, F-ALM is implemented into a high-order, in-house LES code to simulate National Renewable Energy Laboratory Phase VI wind turbine. It is then followed by a comparison between the baseline ALM and the newly implemented F-ALM in terms of instantaneous and time-averaged flow fields and blade loads, revealing the advantages of F-ALM in preventing the overprediction of power on coarse grids. Finally, this encourages accurate and affordable simulations of multirotor devices in the future.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
European Union; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1845963
Report Number(s):
NREL/JA-5000-81632; MainId:82405; UUID:5d0e77af-7f63-46bf-bb59-0c8c31b51e9d; MainAdminID:63706
Journal Information:
Journal of Wind Engineering and Industrial Aerodynamics, Journal Name: Journal of Wind Engineering and Industrial Aerodynamics Vol. 222; ISSN 0167-6105
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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