Abstract
Among various hybrid RANS/LES methodologies, Speziale’s Very Large Eddy Simulation (VLES) is one that was early proposed and is a unified simulation approach that can change seamlessly from RANS to DNS depending on the numerical resolution. The present study proposes a new improved variant of the original VLES model. The advantages are achieved in two ways: (1) RANS simulation can be recovered near the wall which is similar to the Detached Eddy Simulation (DES) concept; (2) An LES subgrid scale model can be reached by the introduction of a third length scale, i.e. integral turbulence length scale. Thus the new model can provide a proper LES mode between the RANS and DNS limits. This new methodology is implemented in the standard k − ε model and Wilcox’s k − ω model. Applications are conducted for the turbulent channel flow at Re τ = 395 and turbulent flow past a square cylinder at Re = 22000. Results are compared with previous studies. It is demonstrated that the new method is quite effective in resolving the large flow structures, and can give satisfactory predictions on a very coarse mesh.
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© 2012 Springer-Verlag Berlin Heidelberg
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Han, X., Krajnović, S. (2012). A New Very Large Eddy Simulation Model for Simulation of Turbulent Flow. In: Fu, S., Haase, W., Peng, SH., Schwamborn, D. (eds) Progress in Hybrid RANS-LES Modelling. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 117. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31818-4_11
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DOI: https://doi.org/10.1007/978-3-642-31818-4_11
Publisher Name: Springer, Berlin, Heidelberg
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