Assessment of a common nonlinear eddy-viscosity turbulence model in capturing laminarization in mixed convection flows

作者：Keshmiri Amir^*; Revell Alistair; Darabkhani Hamidreza Gohari

来源：Numerical Heat Transfer Part A-Applications, 2016, 69(2): 146-165.

DOI：10.1080/10407782.2015.1069672

Laminarization is an important topic in heat transfer and turbulence modeling. Recent studies have demonstrated that several well-known turbulence models failed to provide accurate prediction when applied to mixed convection flows with significant re-laminarization effects. One of those models, a well-validated cubic nonlinear eddy-viscosity model, was observed to miss this feature entirely. This paper studies the reasons behind this failure by providing a detailed comparison with the baseline Launder-Sharma model. The difference is attributed to the method of near-wall damping. A range of tests have been conducted and two noteworthy findings are reported for the case of flow re-laminarization.

• 出版日期2016-1-17