Towards wall models for LES of separated flows
Publication date
2007-06
Document type
Conference paper
Author
Organisational unit
Institute of Fluid Mechanics, University of Erlangen–Nuremberg
Conference
ITi Conference on Turbulence 2005 ; Bad Zwischenahn, Germany ; Sept. 25–28, 2005
Publisher
Springer
Series or journal
Springer Proceedings in Physics
Periodical volume
109
Book title
Progress in turbulence II : Proceedings of the ITi Conference in Turbulence 2005
First page
267
Last page
270
Peer-reviewed
✅
Part of the university bibliography
Nein
Language
English
Abstract
A key technology for the application of LES to high–Re flows of engineering interest is an appropriate wall modeling strategy bridging the near–wall region and thus avoiding the expensive DNS–like resolution. Standard wall models such as Schumann’s model work well for attached flows, e.g. plane channel flow, where the averaged quantities required can be calculated. The model reads: τ w = [ |τ w | / |v tan| ] v tan. Hence, a phase coincidence of the instantaneous wall shear stress τ w and the tangential velocity v tan at the wall–nearest grid point is assumed. More complex 3–D flows with large pressure gradients or local separation are not well reproduced. For such flows the mean values required are not accessible and the validity of the law of the wall used is questionable. The model of Werner and Wengle (WW) reads τ w = f (|vtan|) vtan where f (|vtan|) is expressed by a law of the wall applied directly to the instantaneous quantities. Therefore, this model is also not able to predict separated flows correctly. The main reason is the dependence of τ w on additional quantities such as the pressure gradient ∇p. Thus, attempts were made to take ∇p into account, e.g. by Hoffmann and Benocci.
Cite as
Breuer, M., Kniazev, B., Abel, M.: Towards Wall Models for LES of Separated Flows, ITi Conference on Turbulence 2005, Sept. 25–28, 2005, Bad Zwischenahn, Germany, In: Progress in Turbulence II, eds. Oberlack, Khujadze, Günther, Weller, Frewer, Peinke and Barth, Springer Proceedings in Physics, vol. 109, ISBN 978–3–540–32602–1, pp. 267–270, Springer Verlag, Berlin Heidelberg New York, (2007).
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Published version
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