Comparative numerical analysis of the flow pattern and performance of a foil in flapping and undulating oscillations

Abbaspour, M.; Ebrahimi, Mohsen

doi:10.1007/s00773-014-0297-7

Cited by 15 publications

(13 citation statements)

References 51 publications

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“…Much of the CFD simulations involving fish locomotion utilize a body fitted mesh [14][15][16][17][18][19][20][21]. This is a single mesh that conforms to the body of the swimmer and expands into the free stream.…”

Section: Overset Gridmentioning

confidence: 99%

“…This has led to scientists utilizing vortex panel methods to model fish motion [11][12][13]. With the advent of Computational Fluid Dynamics (CFD), there have been a number of both two-and three-dimensional studies of fish locomotion and energetics [14][15][16][17][18][19][20][21]. These studies deal with Anguilliform and Carangiform locomotion, while none model Ostraciiform and few address Thunniform swimming [22].…”

Section: Introductionmentioning

confidence: 99%

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IKA-FLOW : A Flexible Body Overset Mesh Implementation for Fish Swimming

Coe

Gutschmidt

2023

OpenFOAM J

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Simulation of inertial aquatic swimmers requires fluid structure interactions with temporal body geometry deformation. In practice, his results in a change of the computational domain boundaries that represent the ”swimmer.” These simulations are traditionally done sing body-fitted mesh and mesh morphing methods, but have drawbacks of negative cell volumes and small time-steps to account for the complex swimming motion. In contrast, the overset mesh method, also provided by OpenFOAM®, overcomes most of the drawbacks of the mesh morphing method at the expense of interpolation error. The current OpenFOAM® overset motion library only supports rigid body motion and cannot be used to resolve a body undergoing undulation. A modified motion solver is presented that allows for the complex mesh motion of an overset mesh for four body-caudal fin (BCF) virtual swimmers. The results of this solver are compared with published data of body-fitted meshes. The effect of different simulation parameters (including number of solving iterations, time delay, and temporal resolution) is investigated. Additionally, a novel simulation and comparison of the Ostraciiform locomotion mode with Anguilliform, Carangiform, and Thunniform modes are made investigating the wake, drag and lift. It is concluded that fish undulation has a marked effect on reducing lift generation. Lastly, a comparison of turbulence models (Spalart-Allmaras, k − ω SST, and k − kL − ω) at multiple Reynolds numbers shows that all three models have similar performance at lower Reynolds numbers but diverge at higher numbers.

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Section: Overset Gridmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

IKA-FLOW : A Flexible Body Overset Mesh Implementation for Fish Swimming

Coe

Gutschmidt

2023

OpenFOAM J

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show abstract

“…This definition, also known as the Froude efficiency (Sfakiotakis et al, 1999), has been widely used in a number of previous self-propelled studies, such as the anguilliform and carangiform fish (Borazjani and Sotiropoulos, 2010), the thunniform fish (Li et al, 2017), as well as some researches on flapping wings (Abbaspour and Ebrahimi, 2015;Zhou et al, 2016).…”

Section: Propulsion Efficiency Effmentioning

confidence: 99%

Computational investigation on a self-propelled pufferfish driven by multiple fins

Xiao

Liu

et al. 2020

Ocean Engineering

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Based on experimental measurements of a live fish, a numerical model is established for a pufferfish driven by the locomotion of its multiple flexible fins. The self-propelled motion of the fish is investigated under unsteady swimming conditions, including the accelerating and subsequent quasi-steady stage, to analyse the motion mechanisms of a real fish model with multiple flexible fins. Present numerical approach combines Computational Fluid Dynamics (CFD) and Multi-Body Dynamics (MBD), which allows for the analysis of the interaction between fluid and a fish with multiple fins.Benefitting from the available experimental data of the live fish, the deformation of each fin surface can be prescribed, and we name this condition as flexible in this paper.To elucidate the impact of flexible fins on the propulsion performance of fish swimming, simulations are also performed for rigid fins with the same kinematic motion profiles imposed on the leading edge of fin surfaces. With the developed tool, unsteady hydrodynamic forces, vortex interaction between body and fins associated with MPF swimming mode are numerically predicted. The obtained results highlight the effect of flexibility of fins on thrust generation and efficiency improvement for fish undergoing free-swimming.

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“…Fish possess extraordinary underwater motion skills as a result of long-term evolution, which has inspired the design and construction of autonomous underwater vehicles (Madjid & Mohsen, 2015;Tong, 2000;Tong & Zhuang, 1998). The world's first fish-like robot, Robo-Tuna, has been developed, with a maximum swimming speed of 2 m/s (Bandyopadhyay, 2005).…”

Section: Introductionmentioning

confidence: 99%

Evolvement rule and hydrodynamic effect of fluid field around fish-like model from starting to cruising

Xue

Liu

et al. 2020

Engineering Applications of Computational Fluid Mechanics

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Underwater vehicles are widely used in underwater detection, and bionic design, e.g. imitating fish, is an important way to improve their hydrodynamic performance. Most research is on the mechanical structure and kinematics of fish-like models, while evolvement rules and hydrodynamic effects of fluid field around fish have not been studied adequately. In this paper, a kinematic model to simulate the swimming motion of fish is established according to the actual movement of tuna, and the model is optimized to achieve convenient adjustment in the initial oscillating position and maximum oscillating amplitude. A numerical simulation model is established and the boundary condition is verified by experiments with a physical fish-like prototype and a set of force measuring devices. The evolvement rule of the fluid field around the fish-like model from starting to cruising is determined and the hydrodynamic effect is analyzed. The issue of the effect of fluid fields with various averaged fish-like model densities in the buoyancy regulating process is discussed. Finally, a novel way to calculate the Strouhal number is proposed. The results show that the averaged drag force coefficient decreases as the fish-like model speeds up, because the water pressure near the fish head strengthens to generate a larger resistance force and the vortex in the wake field disperses to produce a less positive effect. The viewpoint that the superposition of vortices will benefit the fish-like model instead of weakening the positive effect is confirmed. The width value of the reversed Kármán vortex street can be connected with the Strouhal number, and the Strouhal number can be calculated by the evolvement rule of the fluid field. This research will contribute to bionic autonomous underwater vehicle design. ARTICLE HISTORY

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Comparative numerical analysis of the flow pattern and performance of a foil in flapping and undulating oscillations

Cited by 15 publications

References 51 publications

IKA-FLOW : A Flexible Body Overset Mesh Implementation for Fish Swimming

IKA-FLOW : A Flexible Body Overset Mesh Implementation for Fish Swimming

Computational investigation on a self-propelled pufferfish driven by multiple fins

Evolvement rule and hydrodynamic effect of fluid field around fish-like model from starting to cruising

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