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 …

Turbulent heat transfer over rough surfaces is crucial in natural and industrial processes, yet
it has received less attention than that of momentum transfer. Recently, research in this field …

CFD of convective heat transfer remains a challenge, especially in channels with irregular
rough walls due to the complex fluid dynamics over and between these roughness …

The heat transfer characteristics of supercritical carbon dioxide (S-CO 2) are vital for S-CO 2
power cycles. Previous studies primarily focused on the heat transfer of S-CO 2 in smooth or …

In the fully rough regime, proposed models predict a scaling for a roughness heat-transfer
coefficient, eg the roughness Stanton number can remain an apt description of the flow …

It is well known that rough surfaces affect turbulent flows significantly. How such surfaces
affect turbulent heat transfer is less well understood. To gain more insight, we have …

Direct numerical simulations (DNS) are used to systematically investigate the applicability of
the minimal-channel approach (Chung et al., J. Fluid Mech., vol. 773, 2015, pp. 418–431) for …

Abstract Direct Numerical Simulations are used to solve turbulent flow and heat transfer over
a variety of rough walls in a channel. The wall geometries are exactly resolved in the …

As additive manufacturing (AM) technology has advanced, an increasing number of aero-
engine cooling components are being fabricated by metal AM. However, the effects of the …

Lattice Boltzmann direct numerical simulation of turbulent open-channel flows over
randomly distributed hemispheres at is carried out to reveal the influence of roughness …