86 citations · 438 across the 27 of their papers we have counts for
23 papers · 1 filter
On local isotropy and scale dependence of pair dispersion in turbulent canopy flows
Ron Shnapp, Alex Liberzon, Yardena Bohbot-Raviv +1
Canopy flows in the atmospheric surface layer play important economic and ecological roles, governing the dispersion of passive scalars in the environment. The interaction of high-…
Improved Prediction of Settling Behaviour of Solid Particles through Machine Learning Analysis of Experimental Retention Time Data
Liron Simon Keren, Teddy Lazebnik, Alex Liberzon
The motion of particles through density-stratified interfaces is a common phenomenon in environmental and engineering applications. However, the mechanics of particle-stratificatio…
Schlieren and BOS velocimetry of a round turbulent helium jet in air
Gary S. Settles, Alex Liberzon
Seedless velocimetry is gaining interest in many industrial and research applications. We report on a comparative study of time-resolved optical velocimetry using traditional, mirr…
OpenPIV-Matlab -- An open-source software for particle image velocimetry; test case: birds' aerodynamics
Hadar Ben Gida, Roi Gurka, Alex Liberzon
We present an open-source MATLAB package, entitled OpenPIV-Matlab, for analyzing particle image velocimetry (PIV) data. We extend the PIV analysis with additional tools for post-pr…
Turbulence -- Obstacle Interactions in the Lagrangian Framework: Applications for Stochastic Modeling in Canopy Flows
Ron Shnapp, Yardena Bohbot-Raviv, Alex Liberzon +1
Lagrangian stochastic models are widely used to predict and analyze turbulent dispersion in complex environments, such as in various terrestrial and marine canopy flows. However, d…
Transient stratification force on particles crossing a density interface
Lilly Verso, Maarten van Reeuwijk, Alexander Liberzon
We perform a series of experiments to measure Lagrangian trajectories of settling and rising particles as they traverse a density interface of thickness using an index-matched…
Extended 3D-PTV for direct measurements of Lagrangian statistics of canopy turbulence in a wind tunnel
Ron Shnapp, Erez Shapira, David Peri +3
Direct estimation of Lagrangian turbulence statistics is essential for the proper modeling of dispersion and transport in highly obstructed canopy flows. However, Lagrangian flow m…
Generalization of Turbulent Pair Dispersion to Large Initial Separations
Ron Shnapp, Alex Liberzon
We present a generalization of turbulent pair dispersion to large initial separations (), by introducing a new time scale, , that reflects the persistence of i…
Robust and fast online identification of streamwise vortices properties for closed-loop control purposes
Caroline Braud, Alex Liberzon
We propose to combine the active vortex generators with the particle image velocimetry (PIV) measurements and post-processing streamwise vortex characterization algorithms into a f…
Small scale dynamics of a shearless turbulent/non-turbulent interface in dilute polymer solutions
Giacomo Cocconi, Elisabetta De Angelis, Bettina Frohnapfel +2
We study the physics of turbulent/non-turbulent interface of an isolated turbulent region in dilute polymer solutions and Newtonian fluid. The performance of a FENE-P model with a…
Flow sensing by buckling monitoring of electrothermally actuated double-clamped micro beams
Yoav Kessler, Slava Krylov, Alex Liberzon
We report on a flow sensing approach based on deflection monitoring of micro beams buckled by the compressive thermal stress due to electrothermal Joules heating. The air stream co…
Experimental study of forces on freely moving spherical particles during resuspension into turbulent flow
Hadar Traugott, Alex Liberzon
Turbulent resuspension, a process of lifting solid particles from the bottom by turbulent flow, is ubiquitous in environmental and industrial applications. The process is a sequenc…
Background Oriented Schlieren in a Density Stratified Fluid
Lilly Verso, Alex Liberzon
Non-intrusive quantitative fluid density measurements methods are essential in stratified flow experiments. Digital imaging leads to synthetic Schlieren methods in which the variat…
Stratified wake of an accelerating hydrofoil
Hadar Ben-Gida, Alex Liberzon, Roi Gurka
Wakes of towed and self-propelled bodies in stratified fluids are significantly different from non-stratified wakes. Long time effects of stratification on the development of the w…
On the estimation of time dependent lift of a European Starling during flapping
Oksana Stalnov, Hadar Ben-Gida, Adam J. Kirchhefer +4
We study the role of unsteady lift in the context of flapping wings in birds' flight. Both aerodynamicists and biologists attempt to address this subject, yet it seems that the con…
Detailed comparative study and a mechanistic model of resuspension of spherical particles from rough and smooth surfaces
Ron Shnapp, Alex Liberzon
Resuspension of solid particles by a tornado-like vortex from surfaces of different roughness is studied using a three-dimensional particle tracking velocimetry (3D-PTV) method. By…
Particle-fluid interaction forces as the source of acceleration PDF invariance in particle size
Yosef Meller, Alex Liberzon
The conditions allowing particle suspension in turbulent flow are of interest in many applications, but understanding them is complicated both by the nature of turbulence and by th…
Moth-inspired navigation algorithm in a turbulent odor plume from a pulsating source
Alex Liberzon, Kyra Harrington, Nimrod Daniel +3
Some female moths attract male moths by emitting series of pulses of pheromone filaments propagating downwind. The turbulent nature of the wind creates a complex flow environment,…
Pulsatility index as a diagnostic parameter of reciprocating wall shear stress 2 parameters in physiological pulsating waveforms
Idit Avrahami, Dikla Kersh, Alex Liberzon
Arterial wall shear stress (WSS) parameters are widely used for prediction of the initiation and development of atherosclerosis and arterial pathologies. Traditional clinical evalu…
Experiments on the vortex wake of a swimming knifefish
Zachary J. Taylor, Alexander Liberzon, Roi Gurka +3
The knifefish species propels itself by generating a reverse Karman street from an anal fin and without significantly moving its body. This unique feature makes this species' propu…
Experimental observation of the steady - oscillatory transition in a cubic lid-driven cavity
A. Liberzon, Y. Feldman, A. Yu. Gelfgat
Particle image velocimetry is applied to the lid-driven flow in a cube to validate the numerical prediction of steady - oscillatory transition at lower than ever observed Reynolds…
Viscous tilting and production of vorticity in homogeneous turbulence
M. Holzner, M. Guala, B. Lüthi +4
Viscous depletion of vorticity is an essential and well known property of turbulent flows, balancing, in the mean, the net vorticity production associated with the vortex stretchin…
Small scale aspects of flows in proximity of the turbulent/non-turbulent interface
M. Holzner, A. Liberzon, N. Nikitin +2
The work reported below is a first of its kind study of the properties of turbulent flow without strong mean shear in a Newtonian fluid in proximity of the turbulent/non-turbulent…