One- and two-equation turbulence models for the prediction of complex cascade flows using unstructured grids

Koubogiannis, DG; Athanasiadis, AN; Giannakoglou, KC

dc.contributor.author	Koubogiannis, DG	en
dc.contributor.author	Athanasiadis, AN	en
dc.contributor.author	Giannakoglou, KC	en
dc.date.accessioned	2014-03-01T01:19:23Z
dc.date.available	2014-03-01T01:19:23Z
dc.date.issued	2003	en
dc.identifier.issn	0045-7930	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15458
dc.subject	unstructured grids	en
dc.subject	Low-Reynolds eddy-viscosity models	en
dc.subject	compressor cascade flows	en
dc.subject	laminar separation bubble	en
dc.subject	turbulent production	en
dc.subject.classification	Computer Science, Interdisciplinary Applications	en
dc.subject.classification	Mechanics	en
dc.title	One- and two-equation turbulence models for the prediction of complex cascade flows using unstructured grids	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0045-7930(01)00086-X	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0045-7930(01)00086-X	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	One- and two-equation, low-Reynolds eddy-viscosity turbulence models are employed in the context of a primitive variable, finite volume, Navier-Stokes solver for unstructured grids. Through the study of the complex flow in a controlled-diffusion compressor cascade at off-design conditions, the ability of the models under consideration to predict the laminar separation bubble close to the leading edge and the boundary layer development is investigated. In order to control the unphysical growth of turbulent kinetic energy near the leading edge stagnation point, appropriate modifications to the conventional models are employed and tested. All of them improve the leading edge flow patterns and significantly affect the size of the predicted laminar separation bubble. The use of an adequately refined mesh around the airfoil, that is formed by triangles placed in a quasi-structured way, allows for the generation of grid elements of moderate aspect ratios. This helps to readily overcome any relevant problems of accuracy; a second-order upwind scheme without flux limiters or least squares approximations is successfully employed for the gradients. The test case includes quasi-3D effects by considering the streamtube thickness variation in the governing equations. (C) 2002 Elsevier Science Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	COMPUTERS & FLUIDS	en
dc.identifier.doi	10.1016/S0045-7930(01)00086-X	en
dc.identifier.isi	ISI:000178810100008	en
dc.identifier.volume	32	en
dc.identifier.issue	3	en
dc.identifier.spage	403	en
dc.identifier.epage	430	en