Results 41 to 50 of about 10,441,290 (359)

Optimal Swimming at Low Reynolds Numbers [PDF]

Physical Review Letters, 2004
Efficient swimming at low Reynolds numbers is a major concern of microbots. To compare the efficiencies of different swimmers we introduce the notion of ``swimming drag coefficient'' which allows for the ranking of swimmers. We find the optimal swimmer within a certain class of two dimensional swimmers using conformal mappings techniques.
Joseph E. Avron, Omri Gat, Oded Kenneth
openaire   +4 more sources

Low Reynolds Number Rotor Blade Aerodynamic Analysis

MATEC Web of Conferences, 2019
Maintaining a steady hover flight in a rotorcraft usually requires high energy input. The aim of the paper is to prove that it is possible to vastly reduce energy use in a rotorcraft by reducing the disc loading.
Tulwin Tytus
doaj   +1 more source

Optimal Strokes of Low Reynolds Number Linked-Sphere Swimmers

Applied Sciences, 2019
Optimal gait design is important for micro-organisms and micro-robots that propel themselves in a fluid environment in the absence of external force or torque.
Qixuan Wang
doaj   +1 more source

Propulsion at low Reynolds number [PDF]

Journal of Physics: Condensed Matter, 2005
We study the propulsion of two model swimmers at low Reynolds number. Inspired by Purcell's model, we propose a very simple one-dimensional swimmer consisting of three spheres that are connected by two arms whose lengths can change between two values. The proposed swimmer can swim with a special type of motion, which breaks the time-reversal symmetry ...
Najafi, A, Golestanian, R
openaire   +1 more source

Rotor blade design and dynamic characteristics analysis of unmanned helicopter

Hangkong gongcheng jinzhan
The widespread application of composite materials in blades also makes the force and stiffness characteristics of blades more complex than traditional blades.
GAO Hongbo
doaj   +1 more source

Unsteady behavior of a confined jet in a cavity at moderate Reynolds numbers [PDF]

, 2012
Self-sustained oscillations in the sinuous mode are observed when a jet impinges on a rigid surface. Confined jet instability is experimentally and numerically investigated here at moderate Reynolds numbers.
Bouchet, Gilles, Climent, Éric
core   +2 more sources

Reynolds number dependence of scalar fluctuations in a high Schmidt number turbulent jet [PDF]

, 1991
The scalar rms fluctuations in a turbulent jet were investigated experimentally, using high-resolution, laser-induced fluorescence techniques. The experiments were conducted in a high Schmidt number fluid (water), on the jet centerline, over a jet ...
Dimotakis, Paul E., Miller, Paul L.
core   +1 more source

Valveless Pumping at Low Reynolds Numbers

Physical Review Applied, 2023
Pumping at low Reynolds number is a ubiquitously encountered feature, both in biological organisms and engineered devices. Generating net flow requires the presence of an asymmetry in the system, which traditionally comes from geometric flow rectifiers.
Gabriel Amselem, Christophe Clanet, Michael Benzaquen   +2 more
openaire   +2 more sources

Steady flow over triangular extended solid attached to square cylinder – A method to reduce drag

Ain Shams Engineering Journal, 2015
Numerical analysis of two dimensional steady flows over a triangular extended solid (thorn) attached to square cylinder positioned at front stagnation point and at rear stagnation point separately is reported at low Reynolds number (Re = 40).
Prasenjit Dey, Ajoy Kr. Das
doaj   +1 more source

Olfactory search at high Reynolds number [PDF]

Proceedings of the National Academy of Sciences, 2002
Locating the source of odor in a turbulent environment—a common behavior for living organisms—is nontrivial because of the random nature of mixing. Here we analyze the statistical physics aspects of the problem and propose an efficient strategy for olfactory search that can work in turbulent plumes.
Boris I. Shraiman, Eugene Balkovsky
openaire   +4 more sources