Numerical study of turbulent diesel flow in a pipe with sudden expansion

Koronaki, ED; Liakos, HH; Founti, MA; Markatos, NC

dc.contributor.author	Koronaki, ED	en
dc.contributor.author	Liakos, HH	en
dc.contributor.author	Founti, MA	en
dc.contributor.author	Markatos, NC	en
dc.date.accessioned	2014-03-01T01:16:49Z
dc.date.available	2014-03-01T01:16:49Z
dc.date.issued	2001	en
dc.identifier.issn	0307-904X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14244
dc.subject	Non-equilibrium parameters	en
dc.subject	Second-moment closure	en
dc.subject	Sudden expansion	en
dc.subject	Turbulence	en
dc.subject.classification	Engineering, Multidisciplinary	en
dc.subject.classification	Mathematics, Interdisciplinary Applications	en
dc.subject.classification	Mechanics	en
dc.subject.other	Diesel fuels	en
dc.subject.other	Kinetic energy	en
dc.subject.other	Mathematical models	en
dc.subject.other	Pipe flow	en
dc.subject.other	Two equation closures	en
dc.subject.other	Turbulent flow	en
dc.subject.other	diesel	en
dc.subject.other	expansion	en
dc.subject.other	mathematical method	en
dc.subject.other	pipe flow	en
dc.subject.other	turbulent flow	en
dc.title	Numerical study of turbulent diesel flow in a pipe with sudden expansion	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0307-904X(00)00055-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0307-904X(00)00055-X	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	Three two-equation models and a second-moment closure are implemented in the case of turbulent diesel flow in a pipe with sudden expansion. The chosen two-equation closures are: the standard k-epsilon, the RNG k-epsilon and the two-scale k-epsilon models. The performance of the models is investigated with regard to the non-equilibrium parameter eta and the mean strain of the flow, S. Velocity and turbulence kinetic energy predictions of the different models are compared among themselves and with experimental data and are interpreted on the basis of the aforementioned quantities. The effect of more accurate near-wall modeling to the two-equation models is also investigated. The results of the study demonstrate the superiority of the second-moment closure in predicting the flow characteristics over the entire domain. From the two-equation models the RNG derived k-epsilon model also gave very good predictions, especially when nonequilibrium wall-functions were implemented. As far as eta and S are concerned, only the closures with greater physical consistency, such as the two-scale k-epsilon model, give satisfactory results. (C) 2001 Elsevier Science Inc. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE INC	en
heal.journalName	Applied Mathematical Modelling	en
dc.identifier.doi	10.1016/S0307-904X(00)00055-X	en
dc.identifier.isi	ISI:000168759000004	en
dc.identifier.volume	25	en
dc.identifier.issue	4	en
dc.identifier.spage	319	en
dc.identifier.epage	333	en