108 citations · 614 across the 14 of their papers we have counts for
14 papers
Experimental study of a turbulent boundary layer with a rough-to-smooth change in surface conditions at high Reynolds numbers
Mogeng Li, Charitha M. de Silva, Daniel Chung +3
This study presents an experimental dataset documenting the evolution of a turbulent boundary layer downstream of a rough-to-smooth surface transition. To investigate the effect of…
Recovery of the wall-shear stress to equilibrium flow conditions after a rough-to-smooth step-change in turbulent boundary layers
Mogeng Li, Charitha M. de Silva, Amirreza Rouhi +4
This paper examines recovery of the wall-shear stress of a turbulent boundary layer that has undergone a sudden transition from a rough to a smooth surface. Early works of Antonia…
Quantifying inner-outer interactions in non-canonical wall-bounded flows
Mogeng Li, Woutijn J. Baars, Ivan Marusic +1
We investigate the underlying physics behind the change in amplitude modulation coefficient in non-canonical wall-bounded flows in the framework of the inner-outer interaction mode…
Scale-dependent inclination angle of turbulent structures in stratified atmospheric surface layers
Xuebo Li, Nicholas Hutchins, Xiaojing Zheng +2
A large-scale spanwise and wall-normal array of sonic anemometers in the atmospheric surface layer is used to acquire all three components of instantaneous fluctuating velocity as…
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…
Near wall coherence in wall-bounded flows and implications for flow control
Milad Samie, Woutijn Baars, Amirreza Rouhi +4
Opposition-control of the energetic cycle of near wall streaks in wall-bounded turbulence, using numerical approaches, has shown promise for drag reduction. For practical implement…
On the mixing length eddies and logarithmic mean velocity profile in wall turbulence
Michael Heisel, Charitha M. de Silva, Nicholas Hutchins +2
Since the introduction of the logarithmic law of the wall more than 80 years ago, the equation for the mean velocity profile in turbulent boundary layers has been widely applied to…
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…
Roughness effects in turbulent forced convection
M. MacDonald, N. Hutchins, D. Chung
We conducted direct numerical simulations (DNSs) of turbulent flow over three-dimensional sinusoidal roughness in a channel. A passive scalar is present in the flow with Prandtl nu…
Vertical Coherence of Turbulence in the Atmospheric Surface Layer: Connecting the Hypotheses of Townsend and Davenport
Dominik Krug, Woutijn J. Baars, Nicholas Hutchins +1
Statistical descriptions of coherent flow motions in the atmospheric boundary layer have many applications in the wind engineering community. For instance, the dynamical characteri…
The minimal-span channel for rough-wall turbulent flows
M. MacDonald, D. Chung, N. Hutchins +3
Roughness predominantly alters the near-wall region of turbulent flow while the outer layer remains similar. This makes it a prime candidate for the minimal-span channel, which onl…
A fast direct numerical simulation method for characterising hydraulic roughness
Daniel Chung, Leon Chan, Michael MacDonald +2
We describe a fast direct numerical simulation (DNS) method that promises to directly characterise the hydraulic roughness of any given rough surface, from the hydraulically smooth…
Spatially developing turbulent boundary layer on a flat plate
J. H. Lee, Y. S. Kwon, N. Hutchins +1
This fluid dynamics video submitted to the Gallery of Fluid motion shows a turbulent boundary layer developing under a 5 metre-long flat plate towed through water. A stationary ima…