Journal ArticleDOI
Lagrangian Coherent Structures in Tandem Flapping Wing Hovering
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TLDR
In this paper, Lagrangian Coherent Structures (LCS) of tandem wings hovering in an inclined stroke plane are studied using ImmersedBoundary Method (IBM) by solving two dimensional (2D) incompressible Navier-Stokes equations.About:
This article is published in Journal of Bionic Engineering.The article was published on 2017-04-10. It has received 13 citations till now. The article focuses on the topics: Vortex & Wake.read more
Citations
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Journal ArticleDOI
Effects of the flapping frequency on the thrust performance for three-dimensional bionic multi-wings in a schooling
Yang Zhang,Jiakun Han,Gang Chen +2 more
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Coherent Structures in the Actively Controlled Wake of a High-Lift Configuration
Ben Steinfurth,Frank Haucke +1 more
TL;DR: Pulsed blowing is applied to prevent turbulent flow separation on the trailing-edge flap of a two-element high-lift wing configuration that is based on a state-of-the-art transonic profile shape.
Journal ArticleDOI
Numerical investigation of the aerodynamic benefits of wing-wing interactions in a dragonfly-like flapping wing
A. R. Shanmugam,Chang Hyun Sohn +1 more
TL;DR: In this article, the aerodynamic benefits of wing-wing interactions on a dragonfly-like flapping wing while hovering were investigated, at a value of Reynolds number Re set to 630.
Journal ArticleDOI
Simulation of flapping wings subjected to gusty inflow
TL;DR: In this paper, a numerical study of the aerodynamics of flapping wings with five different plan-form shapes under the influence of a spatiotemporally varying frontal gust was performed.
Journal ArticleDOI
Recurrence studies of insect-sized flapping wings in inclined-stroke plane under gusty conditions
TL;DR: In this article, the effect of frontal gust on the force patterns of an insect-sized flapping wing in the inclined-stroke plane was assessed using global recurrence plots and windowed recurrence quantification analysis (WRQA).
References
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On the identification of a vortex
Jinhee Jeong,Fazle Hussain +1 more
TL;DR: In this article, the authors propose a definition of vortex in an incompressible flow in terms of the eigenvalues of the symmetric tensor, which captures the pressure minimum in a plane perpendicular to the vortex axis at high Reynolds numbers, and also accurately defines vortex cores at low Reynolds numbers.
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Leading-edge vortices in insect flight
Charles P. Ellington,Coen van den Berg,Coen van den Berg,Alexander P. Willmott,Adrian L. R. Thomas,Adrian L. R. Thomas +5 more
TL;DR: In this article, the authors visualized the airflow around the wings of the hawkmoth Manduca sexta and a 'hovering' large mechanical model, and found an intense leading-edge vortex was found on the downstroke, of sufficient strength to explain the high-lift forces.
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Definition and properties of Lagrangian coherent structures from finite-time Lyapunov exponents in two-dimensional aperiodic flows
TL;DR: The Lagrangian Coherent Structures (LCS) as mentioned in this paper are defined as ridges of Finite-Time Lyapunov Exponent (FTLE) fields, which can be seen as finite-time mixing templates.
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Lagrangian coherent structures and mixing in two-dimensional turbulence
George Haller,Guo-Cheng Yuan +1 more
TL;DR: In this paper, a Lagrangian definition for the boundaries of coherent structures in two-dimensional turbulence is introduced, defined as material lines that are linearly stable or unstable for longer times than any of their neighbors.
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An objective definition of a vortex
TL;DR: In this article, the authors define a vortex as a set of fluid trajectories along which the strain acceleration tensor is indefinite over directions of zero strain, and they show using examples how this vortex criterion outperforms earlier frame-dependent criteria.