Mean wake transitions of wall mounted long prisms at low Reynolds numbers

Transitions of wake structures behind small aspect-ratio (height-to-width) wall-mounted prisms is a multivariate function. It depends on flow parameters, such as Reynolds number, boundary layer thickness, and prism geometry, e.g.- Aspect-ratio and depth-ratio. Transitions in the wake of prisms with changing depth-ratios (length-to-width) remains unexplored in literature. In this study, we numerically investigate the transitions in wake of wall-mounted finite prisms with an aspect-ratio of 1 and varying depth-ratios between 0.016-4 at Reynolds number between 50-500. Preliminary results indicate the suppression of unsteady mechanism with increasing depth-ratio, which restores flow symmetry in a steady wake. The mean wake topology transitions between quadrupole, dipole, and no-pole type wakes. The threshold depth-ratio for such a transition increases with increasing Reynolds number. We aim to expand this study by classifying and characterizing the wake based on observed distinct topologies, which is then used to establish a mechanism of transition in the wake due to changing depth-ratio.