Surface roughness can significantly influence the fluid dynamics and heat transfer in
convective flows by inducing perturbations in the velocity profile which affect surface drag …

The direct numerical simulation of turbulence (DNS) has become a method of outmost
importance for the investigation of turbulence physics, and its relevance is constantly …

The structure of turbulent flow over large roughness consisting of regular arrays of cubical
obstacles is investigated numerically under constant pressure gradient conditions. Results …

DNS results for turbulent channel flow with two-and three-dimensional roughness elements
are discussed. The focus is on surfaces where the separation between consecutive …

A fully turbulent channel flow with smooth and rod-roughened walls has been investigated
using hot-wire anemometry and direct numerical simulations (DNS). The mean flow follows …

Direct numerical simulation (DNS) of a spatially developing turbulent boundary layer (TBL)
over a wall roughened with regularly arrayed cubes was performed to investigate the effects …

Typical engineering rough surfaces show only limited resemblance to the artificially
constructed rough surfaces that have been the basis of most previous fundamental research …

Roughness is classified by the so-called roughness function, which represents the
downward shift of the velocity profile relative to a smooth wall. The dependence of the …

The Reynolds-number dependence of turbulent channel flow over two irregular rough
surfaces, based on scans of a graphite and a grit-blasted surface, is studied by direct …

We perform numerical simulations of a turbulent channel flow over an hyper-elastic wall. In
the fluid region the flow is governed by the incompressible Navier–Stokes (NS) equations …