Large eddy simulations of offshore wind turbine wakes for two floating platform types

Johlas, H. M.; Martínez-Tossas, Luis A.; Lackner, M. A.; Schmidt, D. P.; Churchfield, Matthew J.

doi:10.1088/1742-6596/1452/1/012034

Large eddy simulations of offshore wind turbine wakes for two floating platform types

Journal Article · Tue Mar 03 00:00:00 EST 2020 · Journal of Physics. Conference Series

DOI:https://doi.org/10.1088/1742-6596/1452/1/012034· OSTI ID:1660217

Johlas, H. M. ^[1]; ^[2]; Lackner, M. A. ^[1]; Schmidt, D. P. ^[1]; ^[2]

Univ. of Massachusetts, Amherst, MA (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)

The growing prospect for large farms of floating offshore wind turbines requires a better understanding of wake effects for floating turbines. In this work, large eddy simulations with an actuator line model are used to study the wake of the NREL 5 MW reference turbine mounted on the OC3-UMaine spar and OC4-DeepCwind semi-submersible platforms. The simulations are carried out in the Simulator fOr Wind Farm Applications (SOWFA) coupled with OpenFAST for the platform and turbine motion. The wake location, deficit, and turbulence levels are compared for the two floating platforms and equivalent fixed-turbine cases. The effects of neutral versus stable atmospheric conditions are also compared. Most notably, floating-turbine wakes are deflected upwards compared to fixed-turbine wakes, because of mean platform pitch. The spar wake deflects upwards more than the semi-submersible, while the stable atmosphere increases this vertical deflection compared to the neutral. The time-varying rotor motions do not significantly affect the mid-to-far wake, though the stable atmosphere shows larger fixed-floating differences in horizontal wake fluctuations.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1660217

Report Number(s):: NREL/JA--5000-75358; MainId:6755; UUID:ad588523-1b00-ea11-9c29-ac162d87dfe5; MainAdminID:16306

Journal Information:: Journal of Physics. Conference Series, Journal Name: Journal of Physics. Conference Series Vol. 1452; ISSN 1742-6588

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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