Numerical Simulation Of The Flow Across An Asymmetric Street Intersection

Transcript

A numerical simulation of the flow across an asymmetric street junction formed by four rings of buildings has been performed with the commercial flow solver FLUENT V6.1 using the Reynolds averaged Navier-Stokes equations with six different turbulence models. The turbulence models comprised four linear two-equation models and a differential Reynolds stress model with two formulations for the pressure-strain. The simulations were done for two directions of the approach flow using three systematically refined grids for each case. The results on the finest grid were shown to differ only slightly from the next coarser grid. These results were then compared with velocity and turbulence measurements that are available from the CEDVAL database. The best results for the velocity are obtained with the realizable and standard    model while the Reynolds stress models perform best for the Reynolds stresses and slightly worse for velocity.