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 …

Quadrant analysis is a simple, but quite useful, turbulence data-processing technique that
has been widely used, principally in the investigation of turbulent shear flows. This article …

We carry out direct numerical simulations of turbulent flow over riblets, streamwise-aligned
grooves that are designed to reduce drag by modifying the near-wall flow. Twenty riblet …

The paper briefly outlines the double-averaging methodology for studying environmental
rough-bed flows. It focuses on the applications of this methodology in environmental …

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 …

In this study, macro-rough flows over beds with different permeability values are simulated
using the large-eddy simulation, and the results are analysed by applying the double …

The roughness functions induced by irregular peak-and/or pit-dominated surfaces in a fully
developed turbulent channel flow are studied by direct numerical simulation. A surface …

Winds are the basic forces for atmospheric transport such as pollutant removal and
pedestrian thermal comfort. The transport capability is commonly measured in terms of …

Direct numerical simulations of fully-developed turbulent channel flow with irregular rough
walls have been performed at four friction Reynolds numbers, namely, 180, 240, 360 and …

Large-eddy simulations are conducted to contrast momentum and passive scalar transport
over large, three-dimensional roughness elements in a turbulent channel flow. Special …