Title: | Hybrid LES-RANS method based on an explicit algebraic Reynolds stress model | Authors: | Breuer, Michael Jaffrézic, Benoit Delgado, Antonio |
Language: | eng | Issue Date: | 2008 | Editors: | Peng, Shia-Hui Haase, Werner |
Publisher: | Springer | Document Type: | Conference Object | Journal / Series / Working Paper (HSU): | Notes on Numerical Fluid Mechanics and Multidisciplinary Design | Volume: | 97 | Page Start: | 487 | Page End: | 492 | Published in (Book): | Advances in hybrid RANS-LES modelling : papers contributed to the 2007 Symposium of Hybrid RANS-LES Methods, Corfu, Greece, 17-18 June, 2007 | Publisher Place: | Berlin | Conference: | 2nd Symposium on Hybrid RANS-LES Methods 2007 | Abstract: | 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 | ISBN: | 978-3-540778134 | ISSN: | 1612-2909 | Publisher DOI: | 10.1007/978-3-540-77815-8_5 |
Appears in Collections: | 3 - Publication references (without fulltext) |
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