2012 | OriginalPaper | Buchkapitel
A New Very Large Eddy Simulation Model for Simulation of Turbulent Flow
verfasst von : Xingsi Han, Siniša Krajnović
Erschienen in: Progress in Hybrid RANS-LES Modelling
Verlag: Springer Berlin Heidelberg
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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.