90 citations · 756 across the 25 of their papers we have counts for
25 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…
Pressure drag reduction via imposition of spanwise wall oscillations on a rough wall
Rahul Deshpande, Aman G. Kidanemariam, Ivan Marusic
The present study tests the efficacy of the well-known viscous drag reduction strategy of imposing spanwise wall oscillations to reduce pressure drag contributions in a transitiona…
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…
Reynolds-number effects on the outer region of adverse-pressure-gradient turbulent boundary layers
Rahul Deshpande, Aron van den Bogaard, Ricardo Vinuesa +2
We study the Reynolds-number effects on the outer region of moderate adverse-pressure-gradient (APG) turbulent boundary layers (TBLs) and find that their small scale energy reduces…
On the relationship between manipulated inter-scale phase and energy-efficient turbulent drag reduction
Rahul Deshpande, Dileep Chandran, Alexander J. Smits +1
We investigate the role of inter-scale interactions in the high-Reynolds number skin-friction drag reduction strategy reported by Marusic et al. (Nat. Commun., vol. 12, 2021). The…
Turbulent drag reduction by spanwise wall forcing. Part 2: High-Reynolds-number experiments
Dileep Chandran, Andrea Zampiron, Amirreza Rouhi +5
Here, we present measurements of turbulent drag reduction in boundary layers at high friction Reynolds numbers in the range of . The efficacy of the approac…
Turbulent drag reduction by spanwise wall forcing. Part 1: Large-eddy simulations
Amirreza Rouhi, Matt K. Fu, Dileep Chandran +3
Turbulent drag reduction through streamwise travelling waves of spanwise wall oscillation is investigated over a wide range of Reynolds numbers. Here, in Part 1, wall-resolved larg…
Evidence that superstructures comprise of self-similar coherent motions in high boundary layers
Rahul Deshpande, Charitha M. de Silva, Ivan Marusic
We present experimental evidence that the superstructures in turbulent boundary layers comprise of smaller, geometrically self-similar coherent motions. The evidence comes from ide…
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…
Data-driven enhancement of coherent structure-based models for predicting instantaneous wall turbulence
Rahul Deshpande, Charitha M. de Silva, Myoungkyu Lee +2
Predictions of the spatial representation of instantaneous wall-bounded flows, via coherent structure-based models, are highly sensitive to the geometry of the representative struc…
Active and inactive components of the streamwise velocity in wall-bounded turbulence
Rahul Deshpande, Jason P. Monty, Ivan Marusic
Townsend (1961) introduced the concept of active and inactive motions for wall-bounded turbulent flows, where the active motions are solely responsible for producing the Reynolds s…
A spectral-scaling based extension to the attached eddy model of wall-turbulence
D. Chandran, J. P. Monty, I. Marusic
Two-dimensional (2-D) spectra of the streamwise velocity component, measured at friction Reynolds numbers ranging from 2400 to 26000, are used to refine a model for the logarithmic…
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…
Energy transfer in turbulent channel flows and implications for resolvent modelling
Sean Symon, Simon J. Illingworth, Ivan Marusic
We analyse the inter-scale transfer of energy for two types of plane Poiseuille flow: the P4U exact coherent state of Park and Graham (2015) and turbulent flow in a minimal channel…
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…
Data-driven decomposition of the streamwise turbulence kinetic energy in boundary layers. Part 2. Integrated energy and
Woutijn J. Baars, Ivan Marusic
Scalings of the streamwise velocity energy spectra in turbulent boundary layers were considered in Part 1. A spectral decomposition analysis provided a means to separate out attach…
Data-driven decomposition of the streamwise turbulence kinetic energy in boundary layers. Part 1. Energy spectra
Woutijn J. Baars, Ivan Marusic
In wall-bounded turbulence, a multitude of coexisting turbulence structures form the streamwise velocity energy spectrum from the viscosity- to the inertia-dominated range of scale…
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…
Coherent structures in the linearized impulse response of turbulent channel flow
Sabarish B. Vadarevu, Simon J. Illingworth, Ivan Marusic
We study the evolution of velocity fluctuations due to an isolated spatio-temporal impulse using the linearized Navier-Stokes equations. The impulse is introduced as an external bo…
Transition to ultimate Rayleigh-Bénard turbulence revealed through extended self similarity scaling analysis of the temperature structure functions
Dominik Krug, Xiaojue Zhu, Daniel Chung +3
In turbulent Rayleigh-Bénard (RB) convection, a transition to the so-called ultimate regime, in which the boundary layers (BL) are of turbulent type, has been postulated. Indeed, a…
Statistics of turbulence in the energy-containing range of Taylor-Couette compared to canonical wall-bounded flows
Dominik Krug, Xiang I. A. Yang, Charitha M. de Silva +4
Considering structure functions of the streamwise velocity component in a framework akin to the extended self-similarity hypothesis (ESS), de Silva \textit{et al.} (\textit{J. Flui…
Two-dimensional energy spectra in high Reynolds number turbulent boundary layers
Dileep Chandran, Rio Baidya, Jason P. Monty +1
Here we report the measurements of two-dimensional (2-D) spectra of the streamwise velocity () in a high Reynolds number turbulent boundary layer. A novel experiment employing m…
Extended self-similarity in moment-generating-functions in wall-bounded turbulence at high Reynolds number
Xiang I. A. Yang, Charles Meneveau, Ivan Marusic +1
In wall-bounded turbulence, the moment generating functions (MGFs) of the streamwise velocity fluctuations develop power-law scaling as a function of th…