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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
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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.
| Item URL in elib: | https://elib.dlr.de/45548/ | |||||||||
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| Document Type: | Conference or Workshop Item (Speech, Paper) | |||||||||
| Title: | Quasi-Unsteady Transition Modelling of Periodic Wakes | |||||||||
| Authors: |
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| Date: | 25 September 2006 | |||||||||
| Journal or Publication Title: | Turbulence, Heat and Mass Transfer 5 | |||||||||
| Refereed publication: | Yes | |||||||||
| Open Access: | No | |||||||||
| Gold Open Access: | No | |||||||||
| In SCOPUS: | No | |||||||||
| In ISI Web of Science: | No | |||||||||
| Page Range: | pp. 213-216 | |||||||||
| Editors: |
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| 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 (old) | |||||||||
| DLR - Research area: | Aeronautics | |||||||||
| DLR - Program: | L ER - Engine Research | |||||||||
| DLR - Research theme (Project): | L - Virtual Engine and Validation Methods (old) | |||||||||
| Location: | Köln-Porz | |||||||||
| Institutes and Institutions: | Institute of Propulsion Technology > Numerical Methodes | |||||||||
| Deposited By: | Kozulovic, Dragan | |||||||||
| Deposited On: | 27 Nov 2006 | |||||||||
| Last Modified: | 27 Apr 2009 13:15 |
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