Fluid–structure analysis of a flexible flapping airfoil at low Reynolds number flow

Unger, Ralf; Haupt, Matthias; Horst, Peter; Radespiel, Rolf

doi:10.1016/j.jfluidstructs.2011.08.009

Cited by 25 publications

(12 citation statements)

References 26 publications

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“…However, in biofluid dynamics research, fluid-structure interaction (FSI) problems are universal [9][10][11]. For this kind of problem, interactions exist among the viscous fluid, deformable body and free-moving boundary [12][13][14]. Therefore, these problems are difficult to solve.…”

Section: Introductionmentioning

confidence: 99%

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

2017

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Bionic foils are usually similar in shape to the locomotive organs of animals living in fluid media, which is helpful in the analysis of the motion mode and hydrodynamic mechanisms of biological prototypes. With the design of underwater vehicles as the research background, bionic foils are adopted as research objects in this paper. A geometric model and a motion model are established depending on the biological prototype. In the model, two typical bionic foils-a NACA foil and a crescent-shaped foil-are chosen as research objects. Simulations of the bionic foils are performed using a numerical method based on computational fluid dynamics software. The hydrodynamic forces acting on the foils and flow field characteristics behind the foils are used to analyze the propulsion performance and hydrodynamic mechanism. Furthermore, a spanwise flexibility model is introduced into the motion model. Next, the hydrodynamic mechanism is further analyzed on the basis of hydrodynamic forces and flow field characteristics with different spanwise flexibility parameters. Finally, an experimental verification platform is designed and built to verify the reliability of the numerical results. Agreement between the experimental and numerical results indicates that the numerical results are reliable and that the analysis of the paper is reasonable.

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Section: Introductionmentioning

confidence: 99%

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

2017

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“…Any new breakthrough in the mechanism will bring new inspiration to the developments of biomimetic propulsors. Therefore, to explore the mechanism, scholars are spending considerable efforts to reveal the essence of the problems with different research methods [3][4][5][6][7][8][9][10]. Among the methods, numerical simulation method has gained growing attention because of its advantages of low input, high efficiency and simple post-processing.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Hydrodynamic Performance of Bionic Caudal Fin

2016

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Abstract:In this work, numerical simulations are conducted to reveal the hydrodynamic mechanism of caudal fin propulsion. In the modeling of a bionic caudal fin, a universal kinematics model with three degrees of freedom is adopted and the flexible deformation in the spanwise direction is considered. Navier-Stokes equations are used to solve the unsteady fluid flow and dynamic mesh method is applied to track the locomotion. The force coefficients, torque coefficient, and flow field characteristics are extracted and analyzed. Then the thrust efficiency is calculated. In order to verify validity and feasibility of the algorithm, hydrodynamic performance of flapping foil is analyzed. The present results of flapping foil compare well with those in experimental researches. After that, the influences of amplitude of angle of attack, amplitude of heave motion, Strouhal number, and spanwise flexibility are analyzed. The results show that, the performance can be improved by adjusting the motion and flexibility parameters. The spanwise flexibility of caudal fin can increase thrust force with high propulsive efficiency.

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“…Inviscid flow was assumed in their models, and the unsteady wake was accounted for by introducing discrete vortices coming off the trailing edge. , Spagnolie et al (2010), and Unger et al (2012) performed two-dimensional (2D) simulations of the viscous incompressible flow to study the passive pitching of elastically mounted panels or deformable airfoils. Full threedimensional (3D) studies were also carried out for flexible plunging airfoils to incorporate chordwise and spanwise deformations (e.g., Chimakurthi et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Force production and asymmetric deformation of a flexible flapping wing in forward flight

Tian

Luo

Song

et al. 2013

Journal of Fluids and Structures

115

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Fluid–structure analysis of a flexible flapping airfoil at low Reynolds number flow

Cited by 25 publications

References 26 publications

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

Study on the Hydrodynamic Performance of Typical Underwater Bionic Foils with Spanwise Flexibility

Numerical Study on Hydrodynamic Performance of Bionic Caudal Fin

Force production and asymmetric deformation of a flexible flapping wing in forward flight

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