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 …

Reliable full-scale prediction of drag due to rough wall-bounded turbulent fluid flow remains
a challenge. Currently, the uncertainty is at least 10%, with consequences, for example, on …

Large-scale secondary flows can sometimes appear in turbulent boundary layers formed
over rough surfaces, creating low-and high-momentum pathways along the surface (Barros …

The characteristics of a turbulent boundary layer overlying a complex roughness topography
were explored with stereo particle-image velocimetry measurements in the wall-normal …

The occurrence of turbulent pulsations in straight pipes of noncircular cross-section leads to
the situation, when the average velocity field includes not only the longitudinal component …

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

The occurrence of secondary flows is investigated for three-dimensional sinusoidal
roughness where the wavelength and height of the roughness elements are systematically …

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 …

Secondary flows can develop in turbulent boundary layers that grow over surfaces with
spanwise inhomogeneities. In this article, we demonstrate the formation of secondary flows …

It is widely acknowledged that streamwise ridges on the bed of open-channel flows generate
secondary currents (SCs). A recent discovery of meandering long streamwise counter …