Search Results - "Gurka, Roi"

The hydrodynamic performance of duck feet for submerged swimming resembles oars rather than delta-wings by Ribak, Gal, Gurka, Roi

“…Waterfowl use webbed feet to swim underwater. It has been suggested that the triangular shape of the webbed foot functions as a lift-generating delta wing…”
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Moth-inspired navigation algorithm in a turbulent odor plume from a pulsating source by Liberzon, Alexander, Harrington, Kyra, Daniel, Nimrod, Gurka, Roi, Harari, Ally, Zilman, Gregory

“…Some female moths attract male moths by emitting series of pulses of pheromone filaments propagating downwind. The turbulent nature of the wind creates a…”
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OpenPIV-MATLAB — An open-source software for particle image velocimetry; test case: Birds’ aerodynamics by Ben-Gida, Hadar, Gurka, Roi, Liberzon, Alex

“…We present an open-source MATLAB package, entitled OpenPIV-MATLAB, for analyzing particle image velocimetry (PIV) data. We extend the PIV analysis with…”
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On an adaptation of the Reynolds number, applicable to body-caudal-fin aquatic locomotion by Gurka, Roi, Nafi, Asif Shahriar, Weihs, Daniel

“…The Reynolds number, which describes the relative importance of viscous and inertial contributions is commonly used to analyze forces on fish and other aquatic…”
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Flow Scales of Influence on the Settling Velocities of Particles with Varying Characteristics by Jacobs, Corrine N, Merchant, Wilmot, Jendrassak, Marek, Limpasuvan, Varavut, Gurka, Roi, Hackett, Erin E

“…The settling velocities of natural, synthetic, and industrial particles were measured in a grid turbulence facility using optical measurement techniques…”
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Open-source computational simulation of moth-inspired navigation algorithm: A benchmark framework by Golov, Yiftach, Benelli, Noam, Gurka, Roi, Harari, Ally, Zilman, Gregory, Liberzon, Alex

“…Olfactory navigation is defined as a task of a self-propelled navigator with some sensors capabilities to detect odor (or scalar concentration) convected and…”
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On the Estimation of Time Dependent Lift of a European Starling (Sturnus vulgaris) during Flapping Flight by Stalnov, Oksana, Ben-Gida, Hadar, Kirchhefer, Adam J, Guglielmo, Christopher G, Kopp, Gregory A, Liberzon, Alexander, Gurka, Roi

“…We study the role of unsteady lift in the context of flapping wing bird flight. Both aerodynamicists and biologists have attempted to address this subject, yet…”
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Wake characteristics of a freely rotating bioinspired swept rotor blade by Nafi, Asif Shahriar, Krishnan, Krishnamoorthy, Debnath, Anup K., Hackett, Erin E., Gurka, Roi

“…Rotor blades can be found in many engineering applications, mainly associated with converting energy from fluids to work (or electricity). Rotor blade geometry…”
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Estimation of unsteady aerodynamics in the wake of a freely flying European starling (Sturnus vulgaris) by Ben-Gida, Hadar, Kirchhefer, Adam, Taylor, Zachary J, Bezner-Kerr, Wayne, Guglielmo, Christopher G, Kopp, Gregory A, Gurka, Roi

“…Wing flapping is one of the most widespread propulsion methods found in nature; however, the current understanding of the aerodynamics in bird wakes is…”
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Leading-edge vortices over swept-back wings with varying sweep geometries by Lambert, William B, Stanek, Mathew J, Gurka, Roi, Hackett, Erin E

“…Micro air vehicles are used in a myriad of applications, such as transportation and surveying. Their performance can be improved through the study of wing…”
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Preliminary investigations of ultrasound induced acoustic streaming using particle image velocimetry by Frenkel, Victor, Gurka, Roi, Liberzon, Alex, Shavit, Uri, Kimmel, Eitan

“…Particle image velocimetry was used to investigate ultrasound-induced acoustic streaming in a system for the enhanced uptake of substances from the aquatic…”
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Exploration-exploitation model of moth-inspired olfactory navigation by Lazebnik, Teddy, Golov, Yiftach, Gurka, Roi, Harari, Ally, Liberzon, Alex

“…Navigation of male moths towards females during the mating search offers a unique perspective on the exploration-exploitation (EE) model in decision-making…”
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Trophic guilds of suction-feeding fishes are distinguished by their characteristic hydrodynamics of swimming and feeding by Olsson, Karin H, Gurka, Roi, Holzman, Roi

“…Suction-feeding in fishes is a ubiquitous form of prey capture whose outcome depends both on the movements of the predator and the prey, and on the dynamics of…”
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The hydrodynamic regime drives flow reversals in suction-feeding larval fishes during early ontogeny by Krishnan, Krishnamoorthy, Nafi, Asif Shahriar, Gurka, Roi, Holzman, Roi

“…Fish larvae are the smallest self-sustaining vertebrates. As such, they face multiple challenges that stem from their minute size, and from the hydrodynamic…”
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Application of passive flow control techniques to attenuate the unsteady near wake of airborne turrets in subsonic flow by Ben-Gida, Hadar, Stefanini, Jean, Stalnov, Oksana, Gurka, Roi

“…External airborne installations of cylindrically-shaped objects, such as turrets, can lead to severe degradation of flight performance. This engineering…”
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Direct Numerical Simulations of a Great Horn Owl in Flapping Flight by Beratlis, Nikolaos, Capuano, Francesco, Krishnan, Krishnamoorthy, Gurka, Roi, Squires, Kyle, Balaras, Elias

“…The fluid dynamics of owls in flapping flight is studied by coordinated experiments and computations. The great horned owl was selected, which is nocturnal,…”
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Effects of leading edge geometry on the vortex shedding frequency of an elongated bluff body at high Reynolds numbers by Taylor, Zachary J., Gurka, Roi, Kopp, Gregory A.

“…Measurements have been performed in a large scale wind tunnel on an elongated bluff body with a chord-to-thickness ratio of 7 over the Reynolds number range…”
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Experimental investigation of tornado-like vortex dynamics with swirl ratio: The mean and turbulent flow fields by Hashemi Tari, Pooyan, Gurka, Roi, Hangan, Horia

“…An experimental simulation of tornado-like vortices is conducted in a small tornado vortex simulator in order to study the effect of swirl ratio on flow…”
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Aerodynamic forces acting on birds during flight: A comparative study of a shorebird, songbird and a strigiform by Nafi, Asif, Ben-Gida, Hadar, Guglielmo, Christopher G., Gurka, Roi

“…•Owl’s wake pattern differs significantly compared to the starling and the sandpiper.•Unsteady drag acts in counter to the steady drag contribution, mainly…”
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Long-Duration Time-Resolved PIV to Study Unsteady Aerodynamics by Taylor, Z J, Gurka, R, Kopp, G A, Liberzon, A

“…A time-resolved particle image velocimetry (PIV) system has been developed at the University of Western Ontario, London, ON, Canada, with long-recording-time…”
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