108 citations · 340 across the 5 of their papers we have counts for
14 papers · 1 filter
Turbulent flow over transitionally rough surfaces with varying roughness densities
M. MacDonald, L. Chan, D. Chung +2
We investigate rough-wall turbulent flows through direct numerical simulations of flow over three-dimensional transitionally rough sinusoidal surfaces. The roughness Reynolds numbe…
Direct numerical simulation of high aspect ratio spanwise-aligned bars
M. MacDonald, A. Ooi, R. García-Mayoral +2
We conduct minimal-channel direct numerical simulations of turbulent flow over two-dimensional rectangular bars aligned in the spanwise direction. This roughness has been often des…
The smooth-wall-like behaviour of turbulence over drag-altering surfaces: a unifying virtual-origin framework
Joseph I. Ibrahim, Garazi Gómez-de-Segura, Daniel Chung +1
We conduct direct simulations of turbulent channels imposing different virtual origins for all three velocities using Robin, slip-like boundary conditions to study the effect of di…
Calculation of the mean velocity profile for strongly turbulent Taylor--Couette flow and arbitrary radius ratios
Pieter Berghout, Roberto Verzicco, Richard J. A. M. Stevens +2
Taylor--Couette (TC) flow is the shear-driven flow between two coaxial independently rotating cylinders. In recent years, high-fidelity simulations and experiments revealed the sha…
Heat transfer in rough-wall turbulent thermal convection in the ultimate regime
Michael MacDonald, Nicholas Hutchins, Detlef Lohse +1
Heat and momentum transfer in wall-bounded turbulent flow, coupled with the effects of wall-roughness, is one of the outstanding questions in turbulence research. In the standard R…
Controlling secondary flow in Taylor-Couette turbulence through spanwise-varying roughness
Dennis Bakhuis, Rodrigo Ezeta, Pieter Berghout +7
Highly turbulent Taylor-Couette flow with spanwise-varying roughness is investigated experimentally and numerically (direct numerical simulations (DNS) with an immersed boundary me…