On numerical modeling of animal swimming and flight

Deng, Hongbin; Xu, Yuanqing; Chen, Duanduan; Dai, Hu; Wu, Jian; Tian, Fang-Bao

doi:10.1007/s00466-013-0875-2

Cited by 79 publications

(59 citation statements)

References 309 publications

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“…Sci. 2016, 6, 15 2 of 12 simulation method has become an important tool to investigate the propulsion mechanism of bio-inspired modes [11]. The application of CFD methods for solving the Navier-Stokes equations has led to significant developments in the visual simulation of fluids.…”

Section: The Geometric Model Of a Caudal Finmentioning

confidence: 99%

“…Among the methods, numerical simulation method has gained growing attention because of its advantages of low input, high efficiency and simple post-processing. Especially with the developments of computer and computational fluid dynamics (CFD) in recent decades, numerical simulation method has become an important tool to investigate the propulsion mechanism of bio-inspired modes [11]. The application of CFD methods for solving the Navier-Stokes equations has led to significant developments in the visual simulation of fluids.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: The Geometric Model Of a Caudal Finmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study on Hydrodynamic Performance of Bionic Caudal Fin

2016

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“…Virtual mass effects were discussed earlier by Lighthill [17]. The numerical modeling of animal swimming and flight was reviewed by Deng et al [18].…”

Section: Introductionmentioning

confidence: 99%

Effect of inertia on laminar swimming and flying of an assembly of rigid spheres in an incompressible viscous fluid

Felderhof

2015

Phys. Rev. E

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A mechanical model of swimming and flying in an incompressible viscous fluid in the absence of gravity is studied on the basis of assumed equations of motion. The system is modeled as an assembly of rigid spheres subject to elastic direct interactions and to periodic actuating forces which sum to zero. Hydrodynamic interactions are taken into account in the virtual mass matrix and in the friction matrix of the assembly. An equation of motion is derived for the velocity of the geometric center of the assembly. The mean power is calculated as the mean rate of dissipation. The full range of viscosity is covered, so that the theory can be applied to the flying of birds, as well as to the swimming of fish or bacteria. As an example a system of three equal spheres moving along a common axis is studied.

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“…New numerical methods were proposed during the past two decades and the calculation precision has been improving [8]. Compared with other methods, the flow field characteristics and hydrodynamic forces at any time can be easily extracted.…”

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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On numerical modeling of animal swimming and flight

Cited by 79 publications

References 309 publications

Numerical Study on Hydrodynamic Performance of Bionic Caudal Fin

Numerical Study on Hydrodynamic Performance of Bionic Caudal Fin

Effect of inertia on laminar swimming and flying of an assembly of rigid spheres in an incompressible viscous fluid

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

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