This thesis describes computational study of recirculating flow over a two-dimensional bluff body.
Two flow geometries considered are :
i) flow over a two-dimensional vertical fence attached to a channel wall.
ii) confined flow around rectangular cylinder.
In order to overcome the problem of numerical diffusion, hybrid and skewed upwind difference are used and compared with each other. Turbulence models examined are two different kinds of the modified K-ε model and a $K-ε-\overline{u'v'}$ model proposed in this study. In the modified K-ε models, one accounts for effects of streamline curvature on turbulence and the other accounts for the perferential influence of normal stresses on the dissipation of turbulence energy.
The results show that the $K-ε-\overline{u'v'}$ model gives the best overall agreement.
