Transition and heat transfer predictions in a turbine cascade at various free-stream turbulence intensities through a one-equation turbulence model

dc.contributor.author	Τσουράκης, Γεώργιος Ι.	el
dc.contributor.author	Κουμπογιάννης, Δημήτριος Γ.	el
dc.contributor.author	Γιαννάκογλου, Κυριάκος Χ.	el
dc.date.accessioned	2015-06-07T20:50:48Z
dc.date.available	2015-06-07T20:50:48Z
dc.date.issued	2015-06-07
dc.identifier.uri	http://hdl.handle.net/11400/15555
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://www.scopus.com/record/display.url?origin=recordpage&eid=2-s2.0-0037140139&citeCnt=19&noHighlight=false&sort=plf-f&src=s&sid=62A9054A815E25F2D3896574D4CE2724.fM4vPBipdL1BpirDq5Cw%3a10650&sot=autdocs&sdt=autdocs&sl=17&s=AU-ID%286507485349%29&relpos=5	en
dc.subject	Οριακά στρώματα ροής
dc.subject	Μεταφορά θερμότητας
dc.subject	Στροβιλομηχανές υψηλής πίεσης
dc.subject	Μαθηματικά μοντέλα
dc.subject	Ακροφύσια
dc.subject	Boundary layer flow
dc.subject	Heat transfer
dc.subject	High pressure turbomachinery
dc.subject	Mathematical models
dc.subject	Nozzles
dc.title	Transition and heat transfer predictions in a turbine cascade at various free-stream turbulence intensities through a one-equation turbulence model	en
heal.type	journalArticle
heal.classification	Μηχανική
heal.classification	Μαθηματικά
heal.classification	Mechanics
heal.classification	Mathematics
heal.classificationURI	N/A-Μηχανική
heal.classificationURI	N/A-Μαθηματικά
heal.classificationURI	http://skos.um.es/unescothes/C02449
heal.classificationURI	http://skos.um.es/unescothes/C02437
heal.keywordURI	http://id.loc.gov/authorities/subjects/sh85092916
heal.identifier.secondary	DOI: 10.1002/fld.262
heal.language	en
heal.access	campus
heal.recordProvider	Τεχνολογικό Εκπαιδευτικό Ίδρυμα Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Ενεργειακής Τεχνολογίας Τ.Ε.	el
heal.publicationDate	2002-04-20
heal.bibliographicCitation	Tsourakis, G.I., Koubogiannis, D.G. and Giannakoglou, K.C. (2002) Transition and heat transfer predictions in a turbine cascade at various free-stream turbulence intensities through a one-equation turbulence model. International Journal for Numerical Methods in Fluids. [Online] 38 (11), pp.1091-1110. Available from: http://www.scopus.com [Accessed 07/06/2015]	en
heal.abstract	The one-equation Spalart-Allmaras turbulence model, coupled with criteria for the prediction of the transition onset, is employed for the numerical prediction of the heat transfer along the nozzle guide vanes of a high-pressure turbine, at various operating conditions. Emphasis is put on how to overcome a known shortcoming of the Spalart-Allmaras model, i.e. its insensitivity to free-stream turbulence. For this purpose, an extra viscosity coefficient is defined and used in the mean flow equations. This extra viscosity is proportional to the free-stream turbulence with a damping in the boundary layer. Its use is adequate to circumvent the aforementioned weakness of the Spalart-Allmaras model, without any other intervention in the model itself. For the prediction of the onset of transition, the Abu-Ghannam and Shaw and the Mayle criteria are used, depending on the level of free-stream turbulence. Both yield very satisfactory predictions in a wide range of Reynolds numbers and/or turbulence intensities. From a numerical point of view, this paper proposes techniques for the implementation of the solution method on unstructured grids with triangular elements and reconfirms findings of previous works, like the suitability of the containment-circle tessellation in highly stretched grids.	en
heal.journalName	International Journal for Numerical Methods in Fluids	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true