Reynolds stress transport models in unsteady and non-equilibrium turbulent flows

Turbulence Modelling of Unsteady Turbulent Flows Using the Stress Strain Lag Model

“…The calculations of Al-Sharif et al [1] showed that stress transport schemes, including the SSG, were generally able to reproduce the different flow behaviours described above, giving reasonable agreement with the DNS data of Yu and Girimaji [26], and so the present results have also been compared to those produced by the SSG RSM. Figure 3 displays the evolution of the turbulent frequency and the ratio of production to dissipation rates of k for the case /S max = 0.5; comparing turbulence models to the DNS data of Yu and Girimaji [26].…”

Assessment of the performance of different classes of turbulence models in a wide range of non-equilibrium flows

“…There is also considerable variability in the sensitivity of second-moment closures to the presence of shear, with the TCL and GL predictions of the k evolution being furthest from the DNS data. The poor response of the TCL, as far as the k level is concerned, is perhaps surprising, given its rigorous derivation, although Al-Sharif et al (2010) concluded that the overprediction of k at high shear rates was largely due to the form of coefficients employed in its e equation. The correct response of the NLEV results from the fact that the parameter c l in the equation for the turbulent viscosity is no longer constant, but depends on the local dimensionless shear.…”

Progress in the extension of a second-moment closure for turbulent environmental flows

“…Jakirlić and Hanjalić (2002) proposed a new model for the dissipation tensor consistent with the near wall limits. The University of Manchester group are now focusing on the extension of the TCL model to unsteady flows (Al-Sharif et al, 2010;Heynes et al, 2013;Craft et al, 2014). Based on the framework of the TCL model, the present authors (Kuwata and Suga, 2013a) developed a second-moment closure for porous medium flows.…”