Numerical simulation of the flow within and over an intersection model with Reynolds-averaged Navier--Stokes method

In this study, the Reynolds-averaged Navier--Stokes (RANS) method isemployed to simulate the flow within andover an intersection model with three kinds of textit{k--$varepsilon $}turbulence closure schemes,namely, standard model, renormalization group (RNG) model and realizabletextit{k--$varepsilon $} model. The comparisonbetween the simulated and observed flow fields shows that the RANS simulationwith all the three turbulence models cannot completely and accurately reproducethe observed flow field in all details. A detailed comparison between thepredicted profiles of wind velocities and the measured data shows that therealizable textit{k--$varepsilon $} model is the best one among the three turbulence closure modelsin general. However, the extent to which the improvement is achieved bythe realizabletextit{k--$varepsilon $} model is still not enough to completely andaccurately describe the turbulent flow in a relatively complexenvironment.