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Quasi-Unsteady Transition Modelling of Periodic Wakes

Kozulovic, Dragan and Röber, Thomas (2006) Quasi-Unsteady Transition Modelling of Periodic Wakes. In: Turbulence, Heat and Mass Transfer 5, pp. 213-216. Begell House Inc. Fifth International Symposium on Turbulence, Heat and Mass Transfer, 2006-09-25, Dubrovnik, Croatia. ISBN 1-56700-229-3.

Full text not available from this repository.

Abstract

An approach is presented which models the unsteady effects of wakes in steady simulations. In particular, the laminar and transitional boundary layers of downstream blades are significantly altered by periodically impinging wakes, which are inherently present in turbomachinery flows. In the present approach, the source terms of a k-omega turbulence model are multiplied by a transition factor, which is a function of the wake Strouhal number. In this way the time-mean values of the boundary layer are reproduced in steady simulations. Besides an academic test case, which has been used for calibration of the model, the paper presents a turbine cascade and a 3-stage low pressure turbine. For these test cases the quasi-unsteady approach yields very good agreement with the measurements at significantly lower computational costs as compared to unsteady simulations. Hence, the method supports a fast and reliable industrial design of turbine airfoils.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Quasi-Unsteady Transition Modelling of Periodic Wakes
Authors:
AuthorsInstitution or Email of Authors
Kozulovic, DraganUNSPECIFIED
Röber, ThomasUNSPECIFIED
Date:25 September 2006
Journal or Publication Title:Turbulence, Heat and Mass Transfer 5
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 213-216
Editors:
EditorsEmail
Hanjalic, K.UNSPECIFIED
Nagano, Y.UNSPECIFIED
Jakirlic, S.UNSPECIFIED
Publisher:Begell House Inc
ISBN:1-56700-229-3
Status:Published
Keywords:turbomachinery, transition modelling, wake-induced transition
Event Title:Fifth International Symposium on Turbulence, Heat and Mass Transfer
Event Location:Dubrovnik, Croatia
Event Type:international Conference
Event Dates:2006-09-25
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Dragan Kozulovic
Deposited On:27 Nov 2006
Last Modified:27 Apr 2009 13:15

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