Journal ArticleDOI
Using Lagrangian coherent structure to understand vortex dynamics in flow around plunging airfoil
TLDR
In this paper, the Lagrangian coherent structures (LCSs) of the flow around two-dimensional airfoil with a plunging motion are numerically investigated, in order to reveal the physics of the unsteady aerodynamics in the flapping wings.About:
This article is published in Journal of Fluids and Structures.The article was published on 2016-11-01. It has received 8 citations till now. The article focuses on the topics: Starting vortex & Lagrangian analysis.read more
Citations
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Journal ArticleDOI
Investigating chaotic wake dynamics past a flapping airfoil and the role of vortex interactions behind the chaotic transition
Chandan Bose,Sunetra Sarkar +1 more
TL;DR: In this paper, the authors investigated the complex vortex interactions in two-dimensional flow-field behind a symmetric NACA0012 airfoil undergoing a prescribed periodic pitching-plunging motion in low Reynolds number regime.
Journal ArticleDOI
An improved non-contact dynamic stress measurement method for turbomachinery rotating blades based on fundamental mistuning model
TL;DR: This study provides a roadmap to measure the dynamic stress of rotating mistuned blisk, with a strong application potential in the stress online monitoring for the industrial turbomachinery with a blade tip timing (BTT) monitoring system.
Journal ArticleDOI
Lock-in mechanism of flow over a low-Reynolds-number airfoil with morphing surface
TL;DR: In this paper, the Lagrangian Coherent Structures (LCSs) were extracted from the unsteady flow to understand the frequency lock-in mechanism of flow separation control of an airfoil at low Reynolds number.
Journal ArticleDOI
Study on dynamics of vortices in dynamic stall of a pitching airfoil using Lagrangian coherent structures
Wei Wang,Wei Wang,Shengli Cao,Shengli Cao,Nannan Dang,Nannan Dang,Jiazhong Zhang,Yoshihiro Deguchi +7 more
TL;DR: In this article, the Lagrangian coherent structures (LCSs) were used to analyze the formation and evolution of vortex structure and mass transport process during dynamic stall of the two-dimensional pitching NACA0012 airfoil.
Journal ArticleDOI
Quantitative analysis of fluid transport in dynamic stall of a pitching airfoil using variational Lagrangian coherent structures and lobe dynamics
TL;DR: In this paper , the evolution of flow structures during dynamic stall of a two-dimensional pitching National Advisory Committee for Aeronautics 0012 airfoil is studied using the variational Lagrangian coherent structures (LCSs), and the mass transport and vorticity transport are precisely analyzed using LCSs and lobe dynamics for further understanding the nature of flow phenomena in dynamic stall.
References
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Journal ArticleDOI
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.
Journal ArticleDOI
Recent progress in flapping wing aerodynamics and aeroelasticity
Wei Shyy,Hikaru Aono,Satish Kumar Chimakurthi,Pat Trizila,Chang-Kwon Kang,Carlos E. S. Cesnik,Hao Liu +6 more
TL;DR: In this article, a review of the recent progress in flapping wing aerodynamics and aeroelasticity is presented, where it is realized that a variation of the Reynolds number (wing sizing, flapping frequency, etc.) leads to a change in the leading edge vortex (LEV) and spanwise flow structures, which impacts the aerodynamic force generation.
Journal ArticleDOI
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.
Journal ArticleDOI
Flapping and flexible wings for biological and micro air vehicles
TL;DR: In this paper, the scaling laws of biological and micro-air vehicles involving wing span, wing loading, vehicle mass, cruising speed, flapping frequency, and power are summarized and discussed.
Journal ArticleDOI
Flapping Wing Aerodynamics: Progress and Challenges
TL;DR: In this article, a review of recent developments in the understanding and prediction of flapping-wing aerodynamics is presented, with a special emphasis on the dependence of thrust, lift, and propulsive efficiency on flapping mode, amplitude, frequency, and wing shape.
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