Evaluation of turbulent time scale of linear revised κ-ε models based on LES data

It is well known that the standard k-ε turbulence model suffers from a serious drawback in overestimating turbulence kinetic energy, k, in the flow with impinging. In order to overcome this drawback, several revised k-ε models have been proposed. Recently, new linear revised k-ε models, namely S, Ω and S-Ω models, were proposed by Nagano & Hattori. The expressions for the turbulent time scale in these new revised k-ε models were modified based on a ‘mixed time-scale’ concept. This study investigated the spatial distribution of turbulent timescale around a bluff body used in these three linear revised k-ε models, and the performance of these models was examined.