Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow

The vorticity dynamics and its relationship to dissipation in the wake of a utility-scale wind turbine are investigated through large-eddy simulation. The vorticity dynamics is assessed through the enstrophy, which is related to the turbulent dissipation. The averaged enstrophy and turbulent dissipa...

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Autor principal:	Daniel Foti
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Wind turbine wake Coherent structures Vorticity dynamics Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/777c93b4527346058c9cd98b8e736d9e
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spelling	oai:doaj.org-article:777c93b4527346058c9cd98b8e736d9e2021-11-30T04:15:41ZCoherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow2095-034910.1016/j.taml.2021.100292https://doaj.org/article/777c93b4527346058c9cd98b8e736d9e2021-07-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2095034921000994https://doaj.org/toc/2095-0349The vorticity dynamics and its relationship to dissipation in the wake of a utility-scale wind turbine are investigated through large-eddy simulation. The vorticity dynamics is assessed through the enstrophy, which is related to the turbulent dissipation. The averaged enstrophy and turbulent dissipation are shown to be quantitatively similar in the wake. Using temporal phase averaging, the vorticity fluctuations are decomposed into coherent and random fluctuations with respect to the frequency of the tip vortices. The enstrophy in the tip vortices is dominated by coherent fluctuations, while the coherent fluctuations of root vortices are immediately saturated by the random vorticity fluctuations of the unstable hub vortex. The coherent strain rate has significant differences compared to the coherent enstrophy within one diameter downwind of blade tip, but the random enstrophy and strain rate are relatively similar. Differences in coherent enstrophy and strain rate decrease further from the rotor.Daniel FotiElsevierarticleWind turbine wakeCoherent structuresVorticity dynamicsEngineering (General). Civil engineering (General)TA1-2040ENTheoretical and Applied Mechanics Letters, Vol 11, Iss 5, Pp 100292- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Wind turbine wake Coherent structures Vorticity dynamics Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Wind turbine wake Coherent structures Vorticity dynamics Engineering (General). Civil engineering (General) TA1-2040 Daniel Foti Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow
description	The vorticity dynamics and its relationship to dissipation in the wake of a utility-scale wind turbine are investigated through large-eddy simulation. The vorticity dynamics is assessed through the enstrophy, which is related to the turbulent dissipation. The averaged enstrophy and turbulent dissipation are shown to be quantitatively similar in the wake. Using temporal phase averaging, the vorticity fluctuations are decomposed into coherent and random fluctuations with respect to the frequency of the tip vortices. The enstrophy in the tip vortices is dominated by coherent fluctuations, while the coherent fluctuations of root vortices are immediately saturated by the random vorticity fluctuations of the unstable hub vortex. The coherent strain rate has significant differences compared to the coherent enstrophy within one diameter downwind of blade tip, but the random enstrophy and strain rate are relatively similar. Differences in coherent enstrophy and strain rate decrease further from the rotor.
format	article
author	Daniel Foti
author_facet	Daniel Foti
author_sort	Daniel Foti
title	Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow
title_short	Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow
title_full	Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow
title_fullStr	Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow
title_full_unstemmed	Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow
title_sort	coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/777c93b4527346058c9cd98b8e736d9e
work_keys_str_mv	AT danielfoti coherentvorticitydynamicsanddissipationinautilityscalewindturbinewakewithuniforminflow
_version_	1718406811611037696

Coherent vorticity dynamics and dissipation in a utility-scale wind turbine wake with uniform inflow

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