The results of a 3D DNS code based on explicit optimized DRP [1] are analyzed for moderate Reynolds number (Re=4200). The aim is to show the ability of these schemes to give accurate results in a small amount of time comparing to others accurate schemes as compact schemes. To this end, we consider a wall-bounded turbulent flow. Periodic boundaries conditions are applied in the streamwise and sp...

A large-scale spanwise and wall-normal array of sonic anemometers in the atmospheric surface layer is used to acquire all three components instantaneous fluctuating velocity as well temperature a range stability conditions. These data permit investigation three-dimensional statistical structure turbulence structures. The present work extends view self-similar wall-attached structures under unst...

We conduct direct simulations of turbulent channels imposing different virtual origins for all three velocities using Robin, slip-like boundary conditions to study the effect displacing perceived by flow components, a mechanism common small-textured surfaces. also explore this opposition control. For riblets, Luchini et al. (1991) proposed that their could be reduced offset between streamwise- ...

We examine the changes in kinetic energy dissipation of a turbulent channel flow caused by a spanwise magnetic field. The numerical study is based on our simulation data from [1] obtained by direct and large eddy simulations. We find that the Joule dissipation can exceed the viscous dissipation in the weakly dissipative bulk region, but remains comparatively small in the turbulence-generating n...

The streamwise velocity statistics in fully-developed rough-wall channel flow have been investigated over gritand mesh-type surface topologies. The flow was demonstrated to be fully-developed and two-dimensional up to the fourth moment of velocity. Though the flow over both surface types appear to exhibit a limited logarithmic region, the regions of inner and outer scaling over the mesh surface...

The relationship between the upstream boundary layer and the unsteadiness of the separated flow in a Mach 2 compression ramp interaction is investigated by performing wide-field PIV and PLS measurements in streamwise-spanwise planes. Presence of spanwise strips of elongated regions of uniform momentum is detected in the upstream boundary layer. These long coherent structures exhibit strong simi...

Numerical simulations of a model of plane Couette flow focusing on its in-plane spatio-temporal properties are used to study the dynamics of turbulent spots. While the core of a spot is filled with small scale velocity fluctuations, a large scale flow extending far away and occupying the full gap between the driving plates is revealed upon filtering out small scales. It is characterized by stre...