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 …

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 …

Direct numerical simulations (DNS) are conducted for turbulent flow through pipes with three-
dimensional sinusoidal roughnesses explicitly represented by body-conforming grids. The …

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 …

Comparison of turbulent boundary layers over smooth and rough surfaces up to high
Reynolds numbers Page 1 J. Fluid Mech. (2016), vol. 795, pp. 210–240. c Cambridge …

Particle image velocimetry experiments were performed to study the impact of realistic
roughness on the spatial structure of wall turbulence at moderate Reynolds number. This …

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

Results of an experimental investigation of the flow over a model roughness are presented.
The series of roughness consists of close-packed pyramids in which both the height and the …

A number of recent studies have demonstrated the existence of so-called large-and very-
large-scale motions (LSM, VLSM) that occur in the logarithmic region of inertia-dominated …

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 …