Numerical simulation of turbulent characteristics (structures and statistics) in channel with periodic two-dimensional ribs

Numerical simulation of turbulent channel flow with periodic two-dimensional ribs has been performed in order to investigate the turbulent characteristic behind the ribs. The Reynolds numbers based on the friction velocity and the channel half width are 10-1500. In the wake region, the mean flow becomes asymmetric with respect to the centerline of the geometry through the Coanda effect. Large - scale vortices are generated at the height of the ribs edges. The small - scale vortices are convicted toward the channel center. The budgets of the Reynolds stresses have been computed. The significant differences are found between the budgets in this study and those in backward - facing step turbulence. The positive Reynolds shear stress (u v) over bar is observed owing to the flow contraction just behind the ribbed. [Mehdi Ahmadi, Behnaz Bagheri Dastgerdi. Numerical simulation of turbulent characteristics (structures and statistics) in channel with periodic two-dimensional ribs. Life Science Journal, 2011;8(4):372-377] (ISSN: 1097-8135). http://www.lifesciencesite.com.