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The work presents an attempt to improve the understanding of reactive drag reducing control of near-wall turbulence with respect to limitations present in a realistic application scenario. The reference reactive control scheme of opposition control is studied using direct numerical simulation through the consideration of various application oriented restrictions, i.e. local control application, limited spatial and temporal resolution of the scheme, sensor noise and control elements arrangement.

Turbulenzkontrolle, Reibungsminderung, Turbulente Grenzschichten, Direkte Numerische Simulation,turbulence control, drag reduction, turbulent boundary layers, direct numerical simulation

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Turbulent transport is currently a prominent and ongoing investigation subject at the interface of methodologies from theory to numerical simulations and experiments, and it covers several spatiotemporal scales. Mathematical analysis, physical modelling, and engineering applications represent different facets of a classical, long-standing problem that is still far from being thoroughly comprehended. The goal of this Special Issue is to outline recent advances of such subjects as multiscale analysis in turbulent transport processes, Lagrangian and Eulerian descriptions of turbulence, advection of particles and fields in turbulent flows, ideal or nonideal turbulence (unstationary/inhomogeneous/anisotropic/compressible), turbulent flows in biofluid mechanics and magnetohydrodynamics, and the control and optimization of turbulent transport. The SI is open to regular articles, review papers focused on the state of the art and the progress made over the last few years, and new research trends.

weak turbulence --- chaotic advection --- Lagrangian chaos --- time-dependent diffusion coefficient --- nematic electroconvection --- defect turbulence --- linear stability analysis --- separation and reattachment --- optimal control --- streak lift-up --- turbulent-wake and Kelvin–Helmholtz instabilities --- incompressibility --- 3D perturbations of 2D steady base flow --- structural sensitivity --- recirculation bubble --- 25° backward-slanted step --- turbulence theory --- intermittency --- breakage model --- Rayleigh–Taylor instability --- relaxation filtering --- implicit LES --- WENO schemes --- Euler equations --- Navier–Stokes equations (RANS) --- Direct Numerical Simulation (DNS) --- turbulence models --- compressible flow --- multiscale --- energy transfer --- cascade --- turbulence --- variable density flow --- baroclinic vortex generation --- incompressible fluid --- magnetic mode --- alpha-effect --- eddy diffusivity --- eddy viscosity --- Padé approximant --- droplets --- cloud micro-physics --- transient evolution --- warm cloud top mixing --- direct numerical simulation --- OpenFOAM --- Runge–Kutta (RK4) --- PISO --- wall-resolved Large Eddy Simulation (LES) --- Rayleigh–Bènard convection --- channel flow --- n/a