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

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dc.contributor.author Koubogiannis, DG en
dc.contributor.author Athanasiadis, AN en
dc.contributor.author Giannakoglou, KC en
dc.date.accessioned 2014-03-01T01:51:55Z
dc.date.available 2014-03-01T01:51:55Z
dc.date.issued 2002 en
dc.identifier.issn 00457930 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/26508
dc.subject Compressor cascade flows en
dc.subject Laminar separation bubble en
dc.subject Low-Reynolds eddy-viscosity models en
dc.subject Turbulent production en
dc.subject Unstructured grids en
dc.subject.other Aspect ratio en
dc.subject.other Bubbles (in fluids) en
dc.subject.other Chemical modification en
dc.subject.other Kinetic energy en
dc.subject.other Laminar flow en
dc.subject.other Mathematical models en
dc.subject.other Navier Stokes equations en
dc.subject.other Reynolds number en
dc.subject.other Turbulence en
dc.subject.other Viscosity en
dc.subject.other Turbulence models en
dc.subject.other Flow patterns en
dc.subject.other cascade en
dc.subject.other flow separation en
dc.subject.other laminar flow en
dc.subject.other Reynolds number en
dc.subject.other turbulence 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.publicationDate 2002 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. © 2002 Elsevier Science Ltd. All rights reserved. en
heal.journalName Computers and Fluids en
dc.identifier.doi 10.1016/S0045-7930(01)00086-X en
dc.identifier.volume 32 en
dc.identifier.issue 3 en
dc.identifier.spage 403 en
dc.identifier.epage 430 en


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