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A revisit of the equilibrium assumption for predicting near-wall turbulence

  • Farid Karimpour (a1) and Subhas K. Venayagamoorthy (a1)


In this study, we revisit the consequence of assuming equilibrium between the rates of production ( $P$ ) and dissipation  $({\it\epsilon})$ of the turbulent kinetic energy  $(k)$ in the highly anisotropic and inhomogeneous near-wall region. Analytical and dimensional arguments are made to determine the relevant scales inherent in the turbulent viscosity ( ${\it\nu}_{t}$ ) formulation of the standard $k{-}{\it\epsilon}$ model, which is one of the most widely used turbulence closure schemes. This turbulent viscosity formulation is developed by assuming equilibrium and use of the turbulent kinetic energy $(k)$ to infer the relevant velocity scale. We show that such turbulent viscosity formulations are not suitable for modelling near-wall turbulence. Furthermore, we use the turbulent viscosity $({\it\nu}_{t})$ formulation suggested by Durbin (Theor. Comput. Fluid Dyn., vol. 3, 1991, pp. 1–13) to highlight the appropriate scales that correctly capture the characteristic scales and behaviour of $P/{\it\epsilon}$ in the near-wall region. We also show that the anisotropic Reynolds stress ( $\overline{u^{\prime }v^{\prime }}$ ) is correlated with the wall-normal, isotropic Reynolds stress ( $\overline{v^{\prime 2}}$ ) as $-\overline{u^{\prime }v^{\prime }}=c_{{\it\mu}}^{\prime }(ST_{L})(\overline{v^{\prime 2}})$ , where $S$ is the mean shear rate, $T_{L}=k/{\it\epsilon}$ is the turbulence (decay) time scale and $c_{{\it\mu}}^{\prime }$ is a universal constant. ‘A priori’ tests are performed to assess the validity of the propositions using the direct numerical simulation (DNS) data of unstratified channel flow of Hoyas & Jiménez (Phys. Fluids, vol. 18, 2006, 011702). The comparisons with the data are excellent and confirm our findings.


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A revisit of the equilibrium assumption for predicting near-wall turbulence

  • Farid Karimpour (a1) and Subhas K. Venayagamoorthy (a1)


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