Computation of turbulent flow over two-dimensional surface-mounted rib

The present study conducted a flow simulation to study a turbulent flow around a two-dimensional surface-mounted rib with varying lengths. The numerical method employs a differencing scheme for integrating the elliptic Reynolds-averaged Navier-Stokes equations and the continuity equation. A two-equation k-epsilon turbulence model is used to simulate the turbulent transport quantities. The near-wall regions of the rib were resolved with a simpler one-equation model using a prescribed length-scale distribution. Results show that upstream of the obstacle the length of the recirculating region remains unchanged with varying the rib lengths; while the downstream length of the recirculating region is a strong function of rib length and changes almost linearly for the varying lengths of H/B=0.1 to 4.0. Reattachment on top of the rib, due to its increasing length affects the downstream boundary layer development.