Evaluation of the effects of turbulence model enhancements on wind turbine wake predictions

Prospathopoulos, JM; Politis, ES; Rados, KG; Chaviaropoulos, PK

dc.contributor.author	Prospathopoulos, JM	en
dc.contributor.author	Politis, ES	en
dc.contributor.author	Rados, KG	en
dc.contributor.author	Chaviaropoulos, PK	en
dc.date.accessioned	2014-03-01T02:04:28Z
dc.date.available	2014-03-01T02:04:28Z
dc.date.issued	2011	en
dc.identifier.issn	1095-4244	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/29439
dc.subject	wind turbine wakes	en
dc.subject	flow modelling	en
dc.subject	Navier-Stokes equations	en
dc.subject	k-omega turbulence model	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	FLOW	en
dc.title	Evaluation of the effects of turbulence model enhancements on wind turbine wake predictions	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The modelling of wind turbine wakes is investigated in this paper using a Navier-Stokes solver employing the k-omega turbulence model appropriately modified for atmospheric flows. It is common knowledge that even single-wind turbine wake predictions with computational fluid dynamic methods underestimate the near wake deficit, directly contributing to the overestimation of the power of the downstream turbines. For a single-wind turbine, alternative modelling enhancements under neutral and stable atmospheric conditions are tested in this paper to account for and eventually correct the turbulence overestimation that is responsible for the faster flow recovery that appears in the numerical predictions. Their effect on the power predictions is evaluated with comparison with existing wake measurements. A second issue addressed in this paper concerns multi-wake predictions in wind farms, where the estimation of the reference wind speed that is required for the thrust calculation of a turbine located in the wake(s) of other turbines is not obvious. This is overcome by utilizing an induction factor-based concept: According to it, the definition of the induction factor and its relationship with the thrust coefficient are employed to provide an average wind speed value across the rotor disk for the estimation of the axial force. Application is made on the case of five wind turbines in a row. Copyright (C) 2010 John Wiley & Sons, Ltd.	en
heal.publisher	WILEY-BLACKWELL	en
heal.journalName	WIND ENERGY	en
dc.identifier.isi	ISI:000288516100009	en
dc.identifier.volume	14	en
dc.identifier.issue	2	en
dc.identifier.spage	285	en
dc.identifier.epage	300	en