Hybrid LES-RANS method based on an explicit algebraic Reynolds stress model
Breuer M, Jaffrezic B, Delgado A (2008)
Publication Type: Conference contribution
Publication year: 2008
Edited Volumes: Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Book Volume: 97
Pages Range: 45-54
Conference Proceedings Title: Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Advances in Hybrid RANS-LES Modelling
Event location: Korfu, Griechenland
ISBN: 9783540778134
URI: http://link.springer.com/chapter/10.1007/978-3-540-77815-8_5
DOI: 10.1007/978-3-540-77815-8_5
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.
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How to cite
APA:
Breuer, M., Jaffrezic, B., & Delgado, A. (2008). Hybrid LES-RANS method based on an explicit algebraic Reynolds stress model. In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Advances in Hybrid RANS-LES Modelling (pp. 45-54). Korfu, Griechenland, GR.
MLA:
Breuer, Michael, Benoit Jaffrezic, and Antonio Delgado. "Hybrid LES-RANS method based on an explicit algebraic Reynolds stress model." Proceedings of the Symposium of Hybrid RANS-LES Methods, Korfu, Griechenland 2008. 45-54.
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