Towards Detached Eddy Simulation Modelling Using a k-Equation Turbulence Model

Conference paper (2006)

Authors

Copyright: © 2006 Peng, S.H.
Hybrid RANS-LES Detached Eddy Simulation (DES) K-DES Modelling K-Equation Turbulent Length Scale
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Published Date

08-09-2006

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Abstract

A detached eddy simulation modelling approach is presented for turbulent flow computations, which is based on the transport equation for turbulent kinetic energy, k (and thus termed k-DES model). The model coefficients in the RANS form are calibrated in wall-attached flow computations, and the LES mode is calibrated in the simulation for decaying, homogeneous, isotropic turbulence. To combine the near-wall RANS mode with the off-wall LES mode, the RANS-LES interface is accomplished by means of an adaptation of turbulent length scales invoked in both the production term and the dissipation term of the k-equation. Examples presented for the modelling validation include a fully developed channel flow, a periodic hill flow and a three-dimensional axisymmetric hill flow. The results are compared with available DNS, LES and experimental data, showing reasonable agreement.

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