Author(s): Cheng Zeng; Jie Zhou
Linked Author(s): Cheng Zeng
Keywords: Numerical modeling; Open-channel flow; Spalart-allmaras model
Abstract: In the present study, a 3D RANS model with S-A turbulence model is developed for simulating fully developed turbulent flows with smooth bed. By comparing to the well-documented laboratory measurements and the corresponding DNS results, the S-A model was valid for simulating openchannel flows with low Reynolds number (Re τ =439) and higher Reynolds number (Re τ =2143) over smooth bed. As the TKE cannot be calculated explicitly in the S-A model, an empirical equation is proposed and used to estimate the TKE for anisotropic turbulence conditions. The resulting profiles of mean velocity, Reynolds stress and TKE agree well with the experimental data and DNS results. The study confirms the applicability of the S-A model in the modelling of open-channel flows.
Year: 2016