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

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Abstract

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.

Bibliographical metadata

Original languageEnglish
Pages (from-to)146-165
JournalNumerical Heat Transfer Part A: Applications
Volume69
Issue number2
DOIs
Publication statusPublished - 30 Nov 2015

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