Aerodynamic performances and wake topology past a square cylinder in the interface of two different-velocity streams

We analyze the incompressible flow past a square cylinder immersed in wake of an upstream splitter plate, which separates two streams different velocities, U T (top) and B (bottom). The Reynolds number associated with below plate is kept constant at [Formula: see text], based on side D as characteristic length. top-to-bottom dissymmetry measured by ratio text] between numbers above plate. equivalent bulk taken mean top bottom changes R range text]. A Hopf bifurcation occurs ([Formula: text]), results asymmetric Kármán vortex street vortices only showing high-velocity wake. spanwise modulational instability responsible for three-dimensionalization text]) wavelength For velocity ratios becomes spatiotemporally chaotic. migration stagnation base pressure points front rear surfaces increased determine boundary layer properties and, them, shear layers that roll up into formation vortices, turn help to clarify evolution lift drag coefficients. symmetries solutions across transition regime are imprinted can, therefore, be analyzed from time distribution trailing edge displacement thickness corners.