A study of the flow downstream of a wind turbine using measurements and simulations

Magnusson, M; Rados, KG; Voutsinas, SG

dc.contributor.author	Magnusson, M	en
dc.contributor.author	Rados, KG	en
dc.contributor.author	Voutsinas, SG	en
dc.date.accessioned	2014-03-01T01:44:38Z
dc.date.available	2014-03-01T01:44:38Z
dc.date.issued	1996	en
dc.identifier.issn	0309524X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24436
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0030417681&partnerID=40&md5=1dab0ae8ff16ebbc47b5a60ba5f5fe3a	en
dc.subject.other	Computer simulation	en
dc.subject.other	Mathematical models	en
dc.subject.other	Navier Stokes equations	en
dc.subject.other	Shear stress	en
dc.subject.other	Turbulence	en
dc.subject.other	Velocity measurement	en
dc.subject.other	Wakes	en
dc.subject.other	Wind effects	en
dc.subject.other	Vortex-particle approach	en
dc.subject.other	Wind turbines	en
dc.subject.other	flow characteristics	en
dc.subject.other	wakes	en
dc.subject.other	wind turbines	en
dc.title	A study of the flow downstream of a wind turbine using measurements and simulations	en
heal.type	journalArticle	en
heal.publicationDate	1996	en
heal.abstract	In this paper characteristic parameters in a wind turbine wake are studied. The data used are full-scale measurements from a wind farm in Alsvik, Sweden, and predictions from a numerical model applied 10 the same site The results are valid for neutral stratification. The model employs a vortex-particie approach in the rotor region, an axisymmetric solver of the turbulent Navier-Stokes equations in the near wake and self preservation in the far wake. Turbulence is modelled by the k-ε model which is properly modified to account for atmospheric flows on one hand and jet-flows on the other. The investigated quantities are: the relative centre line velocity deficit and some of the parameters in the turbulence energy budget at four distances downstream the turbine. In three of the cases the wind is coming from the sea, in the fourth case the wind is coming over the island The model was run for two fixed wind speeds, 8 and 11 ms-1, neutral stratification, and two turbulence intensities 0.06 and 0.07 which are of the order found in thr cases with wind coming from the sea. For inland winds the turbulence intensity is much higher, namely 0.13. At all locations the velocity predictions are good compared with measurements. Also good is the prediction of the turbulence kinetic energy and the axil-to-radial shear stress ftV indicating that the modifications introduced in the turbulence model are correct and necessary.	en
heal.journalName	Wind Engineering	en
dc.identifier.volume	20	en
dc.identifier.issue	6	en
dc.identifier.spage	389	en
dc.identifier.epage	403	en