Title: Hybrid LES-RANS method based on an explicit algebraic Reynolds stress model
Authors: Breuer, Michael  
Jaffrézic, Benoit 
Delgado, Antonio 
Language: en_US
Subject (DDC): DDC - Dewey Decimal Classification::000 Informatik, Wissen, Systeme
DDC - Dewey Decimal Classification::500 Naturwissenschaften
DDC - Dewey Decimal Classification::600 Technik
Issue Date: 2008
Editors: Peng, Shia-Hui
Haase, Werner
Publisher: Springer
Document Type: Conference Proceedings
Journal / Series / Working Paper (HSU): Notes on Numerical Fluid Mechanics and Multidisciplinary Design 
Volume: 97
Page Start: 487
Page End: 492
Publisher Place: Berlin
Document Version: draft
Conference: 2nd Symposium on Hybrid RANS-LES Methods 2007 
Although LES is a highly promising simulation technique, it still suffers from extremely large resources required for the resolution of the near-wall region, especially for high-Re flows. That is the main motivation for setting up hybrid LES-RANS methods. Whereas RANS suits reasonably well to attached boundary layers, requiring much less CPU-time and memory than LES, the latter is recommended for complex large-scale flow phenomena, which RANS often fails to predict correctly. Both characteristics are combined in hybrid LES-RANS methods to obtain an optimal solution at lower cost. Meanwhile a variety of different hybrid concepts were proposed including DES. In the present study a non-zonal approach based on two different but unique models is preferred. The predefinition of RANS and LES regions is avoided and a gradual transition between both methods takes place which weakens the problem of setting up an appropriate coupling strategy. The new hybrid LES-RANS approach relies on a one-equation model for the turbulent kinetic energy in both modes. At this phase the model is of linear type. In addition to this linear eddy-viscosity model (LEVM), an explicit algebraic Reynolds stress model (EARSM) is applied in the RANS mode in order to account for the Reynolds stress anisotropy. This insertion leads to a non-linear model. The linear version is used for comparison in order to emphasize the advantages of the non-linear formulation. Both model variants have been tested on the basis of the standard plane channel flow and the flow over a periodic arrangement of hills. © 2008 Springer-Verlag Berlin Heidelberg.
Organization Units (connected with the publication): Strömungsmechanik 
URL: https://api.elsevier.com/content/abstract/scopus_id/38649130693
ISBN: 9783540778134
ISSN: 16122909
DOI: https://doi.org/10.1007/978-3-540-77815-8_5
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