Direct-numerical-simulation 1 Flow structure 1 Geometry 1 Kinetic energy 1 Kinetics 1 Navier Stokes equations 1 Probability density function 1 Reynold number 1 Reynolds number 1 Shear flow 1 Shear stress 1 Streamwise velocity 1 Three-dimensional flow structure Top surface 1 Turbulent flow 1 Turbulent kinetic energy 1 Vortex flow 1 Vortex shedding 1 Vortex-shedding 1 Wall mounted cubes 1 Wall shear stress 1 Wall-shear stress 1