Publication

Abstract : The spatio-temporal dynamics of the flow around a wall-mounted bluff body immersed in a turbulent boundary layer is investigated numerically, on a 2D vertical plane using ANSYS-Fluent, over a wide parameter ranges. The submergence ratios ( S R ) considered for the study are 1.5–10, that covers the entire regime of low, intermediate, and high S R . The Reynolds numbers ( R e h ) considered are 8 , 400 − 56 , 000 , that falls within the turbulent regime. The steady and fluctuating flow fields are investigated as a response to varying S R and R e h . It is demonstrated that in the Reynolds numbers range considered, there exists an optimum S R up to which normalized mean reattachment length is proportionate to S R and beyond that optimum value, normalized mean reattachment length is inversely proportionate to S R . In general, the maximum reattachment length over the entire S R range considered, does not show any coherent variability with R e h . Maxima and minima of the normalized mean velocity fields are found to be inveresly proportionate to S R (with varying degree) and independent of R e h . The skin friction coefficient, C f is proportional to R e h and inversely proportional to S R on all three edges of the obstacle. The maximum Reynolds shear stress seems to occur approximately at the reattachment point. The general observation is: the time-averaged kinematic fields are asymmetrically more influenced by S R over R e h , whereas time dependent fluctuating fields show much higher dependence on R e h compared to S R .