43 citations · 159 across the 14 of their papers we have counts for
14 papers
Reynolds-number evolution of wall-pressure statistics beneath canonical turbulent boundary layers
Rahul Deshpande, Balaraman Panneerselvam, Vijaya R. R. Gudla +2
This study investigates the Reynolds-number (Re_τ) evolution of wall-pressure statistics beneath zero-pressure-gradient TBLs, and links their logarithmic variation to the increasin…
High-Reynolds-number turbulent boundary layers under adverse pressure gradients. Part 1. Decoupling local and upstream pressure gradient effects
Ahmad Zarei, Mitchell Lozier, Rahul Deshpande +1
This study presents a controlled examination of the universality of the von Karman and additive coefficients in the logarithmic law of the mean streamwise velocity profile for high…
Defining the mean turbulent boundary layer thickness based on streamwise velocity skewness
Mitchell Lozier, Rahul Deshpande, Ahmad Zarei +3
A new statistical definition for the mean turbulent boundary layer thickness is introduced, based on identification of the point where the streamwise velocity skewness changes sign…
Turbulent/non-turbulent interface in high Reynolds number pressure gradient boundary layers
Ivan Marusic, Wagih Abu Rowin, Mitchell Lozier +3
We report two-dimensional particle image velocimetry experiments in high Reynolds number turbulent boundary layers imposed with a moderately strong streamwise pressure gradient. Th…
A note on the amplitude modulation phenomenon in non-canonical wall-bounded flows
Mitchell Lozier, Ivan Marusic, Rahul Deshpande
The amplitude modulation phenomena, defined originally by Mathis et al. (J. Fluid Mech., 628, 311-337; 2009), corresponds to a unique non-linear interaction between Reynolds number…
Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers
Rahul Deshpande, Ricardo Vinuesa, Joseph Klewicki +1
A phenomenological description is presented to explain the intermediate and low-frequency/large-scale contributions to the wall-shear-stress () and wall-pressure () spe…
Characteristics of active and inactive motions in high-Reynolds-number turbulent boundary layers
Rahul Deshpande, Ricardo Vinuesa, Ivan Marusic
Wall-scaled (attached) eddies play a significant role in the overall drag experienced in high-Reynolds-number turbulent boundary layers (TBLs). This study aims to delve into the un…
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…
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…
Identifying regions of importance in wall-bounded turbulence through explainable deep learning
Andres Cremades, Sergio Hoyas, Rahul Deshpande +8
Despite its great scientific and technological importance, wall-bounded turbulence is an unresolved problem in classical physics that requires new perspectives to be tackled. One o…
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…
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…
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…