Abstract
ABSTRACT: A simplified consistency formulation for Pk/ε (production to dissipation ratio) is devised to obtain a non-singular Cμ (coefficient of eddy-viscosity) in the explicit algebraic Reynolds stress model of Gatski and Speziale. The coefficient Cμ depends non-linearly on both rotational/irrotational strains and is used in the framework of an improved RAS (Rahman–Agarwal–Siikonen) one-equation turbulence model to calculate a few well-documented turbulent flows, yielding predictions in good agreement with the direct numerical simulation and experimental data. The strain-dependent Cμ assists the RAS model in constructing the coefficients and functions such as to benefit complex flows with non-equilibrium turbulence. Comparisons with the Spalart–Allmaras one-equation model and the shear stress transport k-ω model demonstrate that Cμ improves the response of RAS model to non-equilibrium effects.
Original language | English |
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Pages (from-to) | 89-106 |
Number of pages | 18 |
Journal | International Journal of Computational Fluid Dynamics |
Volume | 30 |
Issue number | 2 |
DOIs | |
Publication status | Published - 7 Feb 2016 |
MoE publication type | A1 Journal article-refereed |
Keywords
- eddy-viscosity coefficient
- non-equilibrium flow
- one-equation model
- Production-to-dissipation ratio