Blade-resolved CFD simulations of a periodic array of NREL 5 MW rotors with and without towers

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dc.contributor.authorMa, Lun
dc.contributor.authorDelafin, Pierre-Luc
dc.contributor.authorTsoutsanis, Panagiotis
dc.contributor.authorAntoniadis, Antonis F.
dc.contributor.authorNishino, Takafumi
dc.date.accessioned2022-01-20T11:53:13Z
dc.date.available2022-01-20T11:53:13Z
dc.date.issued2022-01-14
dc.description.abstractA fully resolved (FR) NREL 5 MW turbine model is employed in two unsteady Reynolds-averaged Navier–Stokes (URANS) simulations (one with and one without the turbine tower) of a periodic atmospheric boundary layer (ABL) to study the performance of an infinitely large wind farm. The results show that the power reduction due to the tower drag is about 5% under the assumption that the driving force of the ABL is unchanged. Two additional simulations using an actuator disc (AD) model are also conducted. The AD and FR results show nearly identical tower-induced reductions of the wind speed above the wind farm, supporting the argument that the AD model is sufficient to predict the wind farm blockage effect. We also investigate the feasibility of performing delayed-detached-eddy simulations (DDES) using the same FR turbine model and periodic domain setup. The results show complex turbulent flow characteristics within the farm, such as the interaction of large-scale hairpin-like vortices with smaller-scale blade-tip vortices. The computational cost of the DDES required for a given number of rotor revolutions is found to be similar to the corresponding URANS simulation, but the sampling period required to obtain meaningful time-averaged results seems much longer due to the existence of long-timescale fluctuations.en_UK
dc.identifier.citationMa L, Delafin P-L, Tsoutsanis P, et al., (2022) Blade-resolved CFD simulations of a periodic array of NREL 5 MW rotors with and without towers. Wind, Volume 2, Issue 1, January 2022, pp. 51-67en_UK
dc.identifier.issn2674-032X
dc.identifier.urihttps://doi.org/10.3390/wind2010004
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/17451
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectactuator disc theoryen_UK
dc.subjecttwo-scale momentum theoryen_UK
dc.subjectwind farm modellingen_UK
dc.subjectwind farm blockageen_UK
dc.subjectURANSen_UK
dc.subjectDDESen_UK
dc.titleBlade-resolved CFD simulations of a periodic array of NREL 5 MW rotors with and without towersen_UK
dc.typeArticleen_UK

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