Study of impinging turbulent jet flows using the isotropic low-Reynolds number and the algebraic stress methods

Souris, N; Liakos, H; Founti, M; Palyvos, J; Markatos, N

dc.contributor.author	Souris, N	en
dc.contributor.author	Liakos, H	en
dc.contributor.author	Founti, M	en
dc.contributor.author	Palyvos, J	en
dc.contributor.author	Markatos, N	en
dc.date.accessioned	2014-03-01T01:18:22Z
dc.date.available	2014-03-01T01:18:22Z
dc.date.issued	2002	en
dc.identifier.issn	0178-7675	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14965
dc.subject	Algebraic stress model	en
dc.subject	Impinging jets	en
dc.subject	Jet flows	en
dc.subject	Low reynolds number model	en
dc.subject.classification	Mathematics, Interdisciplinary Applications	en
dc.subject.classification	Mechanics	en
dc.subject.other	Kinematics	en
dc.subject.other	Mathematical models	en
dc.subject.other	Matrix algebra	en
dc.subject.other	Reynolds number	en
dc.subject.other	Stresses	en
dc.subject.other	Turbulent flow	en
dc.subject.other	Algebraic stress models	en
dc.subject.other	Impinging jets	en
dc.subject.other	Jet flow	en
dc.subject.other	Low Reynolds number model	en
dc.subject.other	Jets	en
dc.title	Study of impinging turbulent jet flows using the isotropic low-Reynolds number and the algebraic stress methods	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s00466-002-0302-6	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s00466-002-0302-6	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	The performance of two-equation turbulence models (such as the low Reynolds number k-epsilon model of Launder and Sharma 1974) is evaluated versus the algebraic stress model (ASM) (Rodi 1976) for high Reynolds number (Re = 9 x 10(4)) jet flows with strong streamline curvature due to impingement onto a flat plate. The partial differential equations for the conservation of mass and momentum are solved using a finite volume method and the predicted velocities are compared to experimental data by Myszko (1997). The paper demonstrates that in the free-jet region both models over-predict the thickness of the jet. The ASM predicts faster jet growth rate and smaller jet thickness than the low Reynolds number model resulting to closer agreement with the experiments. As a consequence of the better performace of the ASM in the free-jet region, predictions in the wall-jet region showed that despite the use of the logarithmic law-of-the-wall function, the ASM results are closer to the experimental points than the predictions obtained with the two-equation model. However, the rate of peak velocity decay is far higher than the experimental one with both turbulence models. Again, the decay rate predicted with the ASM fits better the exprimental data. The implementation of the ASM exhibited convergence problems most of which were atributed to the cross-derivative terms in the k and epsilon equations and were treated using a linear under-relaxation technique. In general the ASM predictions were more accurate than the low Reynolds number k-epsilon model, with an extra computational cost of less than 25%, which makes the model very attractive for the prediction of turbulence characteristics of high Reynolds number flows with strong stramline curvature.	en
heal.publisher	SPRINGER-VERLAG	en
heal.journalName	Computational Mechanics	en
dc.identifier.doi	10.1007/s00466-002-0302-6	en
dc.identifier.isi	ISI:000176323300005	en
dc.identifier.volume	28	en
dc.identifier.issue	5	en
dc.identifier.spage	381	en
dc.identifier.epage	389	en