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A new time scale based k-epsilon model for near wall turbulence
Z. Yang,T. H. Shih +1 more
- 01 Sep 1992
Vol. 92, pp 32868
TL;DR: In this article, a k-epsilon model for wall bonded turbulent flows is proposed and the damping function used in the eddy viscosity is chosen to be a function of R(sub y) = (k(sup 1/2)y)/v instead of y(+).
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Abstract: A k-epsilon model is proposed for wall bonded turbulent flows. In this model, the eddy viscosity is characterized by a turbulent velocity scale and a turbulent time scale. The time scale is bounded from below by the Kolmogorov time scale. The dissipation equation is reformulated using this time scale and no singularity exists at the wall. The damping function used in the eddy viscosity is chosen to be a function of R(sub y) = (k(sup 1/2)y)/v instead of y(+). Hence, the model could be used for flows with separation. The model constants used are the same as in the high Reynolds number standard k-epsilon model. Thus, the proposed model will be also suitable for flows far from the wall. Turbulent channel flows at different Reynolds numbers and turbulent boundary layer flows with and without pressure gradient are calculated. Results show that the model predictions are in good agreement with direct numerical simulation and experimental data.
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Citations
Discussion on the stability of heated channels with different fluids at supercritical pressures
TL;DR: In this paper, a set of dimensionless numbers is proposed to predict the threshold of instabilities in a long circular channel with uniform heating and no singular pressure drop, and linear stability maps generated by a previously developed in-house code, making use of balance equations in dimensionless form, are compared with the results obtained by computations performed in dimensional terms.
Effect of emissivity on the heat and mass transfer of humid air in a cavity filled with solid obstacles.
TL;DR: In this article, a 2D numerical study on the buoyancy-driven low-speed turbulent flow of humid air inside a rectangular cavity partially filled with solid cylindrical objects for a Rayleigh number of 1.45 × 109 was performed.
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Wolfgang Rodi
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