抄録
This study aims to investigate the applicability of the unsteady Reynolds averaged Navier–Stokes equations model (URANS) simulation with the proposed modification that reproduces periodic fluctuations induced by bluff bodies. The modification introduces large scale influence by adding the time scale of the production term of ε–equation in the standard k-ε model. Airflow within a simplified 9 × 9 cubic array with point-source dispersion of air pollutants was tested. We compared the URANS results with those from a large-eddy simulation (LES) and a wind tunnel experiment (WTE). Although the original model dropped the advection term in the time scale for total derivative and only considered the partial differential respect to time for flow around 2D square cylinder, but the advection term has great influence on reproducibility of periodic fluctuations of flow within the array in this study.
