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 …

This paper outlines the authors' experimental research in rough-wall-bounded turbulent
flows that has spanned the past 15 years. The results show that, in general, roughness …

We study the dynamics of turbulent boundary layer flow over a heterogeneous topography
composed of roughness patches exhibiting relatively high and low correlation in the …

Skin-friction, roughness functions and predictive correlations are presented for random
roughness that has a Gaussian power spectral density distribution of surface elevations. The …

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 …

Whereas streamwise effective slope (surfaces in this study can lead to diminished levels of
outer-layer similarity in both mean flow and turbulence statistics, which is attributed to …

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 …

The effect of spanwise wavelength of surface heterogeneity on turbulent secondary flows Page
1 J. Fluid Mech. (2020), vol. 894, A7. c The Author(s), 2020. Published by Cambridge University …

A theoretically based relationship for the Darcy–Weisbach friction factor for rough-bed open-
channel flows is derived and discussed. The derivation procedure is based on the double …