Aerodynamic slot-control for 2D square prisms

Recent research in fluid mechanics has indicated that the non-universality of growth rate parameters in bluff body wakes might be related to the base wake vortex dynamics. This aspect relates to possible aerodynamic control strategies for wind engineering applications. a passive slot control technique is numerically (LES) investigated. It is shown that the slot flow penetrates in the near-wake region generating a Kelvin–Helmholtz-type instability that mitigates the vortex shedding formation. A more elongated wake bubble associates to drag reduction and the decrease in lateral pressure fluctuations reduces the fluctuating lift coefficient.