Non-equilibrium turbulent phenomena in transitional channel flows

作者：Liu, F.; Lu, L. P.; Fang, L.^*

来源：Journal of Turbulence, 2018, 19(9): 731-753.

DOI：10.1080/14685248.2018.1511906

• Non-equilibrium turbulence
• fully-developed turbulence
• transitional channel flow
• turbulence model

Non-equilibrium turbulent flows were considerably investigated in recent years, but most studies are restricted in grid-generated turbulence. In the present contribution we show by large-eddy simulation (LES), that there exists a weakly non-equilibrium turbulence region before the beginning of the full-developed turbulence. Both the dissipation coefficient and the skewness of longitudinal velocity gradient are used as characteristic non-equilibrium quantities, illustrating that the non-equilibrium turbulence region in channel flow is weakly similar to previous studies in grid-generated turbulence. The observation of non-equilibrium turbulence region in transitional channel flow is also expected to inspire future improvement of turbulence models.

• 出版日期2018
• 单位北京航空航天大学