Numerical Investigation on Vortex Shedding from a Hydrofoil with a Beveled Trailing Edge

Lee, Seungjae; Lee, Jun-Hyeok; Suh, Junghun

doi:10.1155/2015/565417

Cited by 9 publications

(14 citation statements)

References 41 publications

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“…Instead, computational fluid dynamics (CFD) simulations can effectively represent vortex shedding. Although Reynolds-averaged Navier-Stokes simulations [8] or large Eddy simulations (LES) [17] cannot fully simulate turbulent flows, their numerical results generally agree well with experimental results and can reflect the physical characteristics of vortex shedding.…”

Section: Introductionmentioning

confidence: 98%

“…This results in unique physical phenomena that can only be modeled by precise numerical simulations. Lee et al [17] studied the vortex shedding of hydrofoils, numerically considering a variety of trailing-edge shapes, and compared their findings with the experimental findings of Ausoni and Zobeiri. In addition, they investigated the effects of periodically varying free-stream flows on vortex shedding.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation on Vortex Shedding from a Hydrofoil in Steady Flow

Wang

Zhao

et al. 2020

JMSE

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This paper presents a numerical modeling procedure for the idealization of vortex shedding effects in the wake flow field of a NACA0009 hydrofoil. During the simulation, the lift and drag acting on the hydrofoil were monitored, and the vortex-shedding frequency of the hydrofoil was analyzed. The effects of inflow velocity, trailing-edge thickness, angle of attack, and maximum hydrofoil thickness on vortex shedding were investigated. The results indicate that an increase in the inflow velocity led to an increase in the vortex-shedding frequency and a negligible change in the Strouhal number. Furthermore, as the thickness of the trailing edge increased, the vortex-shedding frequency decreased gradually, whereas the Strouhal number first increased and then decreased. Vortex shedding and lift curve oscillations ceased altogether after the angle of attack of the hydrofoil increased beyond a certain threshold. When the maximum hydrofoil thickness was increased while keeping the thickness and chord length of the trailing edge constant, the vortex-shedding frequency decreased.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Vortex Shedding from a Hydrofoil in Steady Flow

Wang

Zhao

et al. 2020

JMSE

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“…Leroyer and Visonneau have utilized the numerical analysis method to study the hydrodynamic performance of swimming fish with the 3D flexible fish model [ 15 , 16 ]. Lee et al have studied the trailing vortex of oscillating hydrofoil with the Particle-Grid Hybrid Method and Subgrid Eddy Viscosity Model to find that the free stream cycle would affect the shape and the shedding process of trailing vortex [ 17 ]. The above researches and methods have important guiding significance on the study of bionic oscillating hydrofoil.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Hydrodynamics for Bionic Oscillating Hydrofoil Based on Panel Method

Xue

Liu

Zhang

et al. 2016

Applied Bionics and Biomechanics

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The kinematics model based on the Slender-Body theory is proposed from the bionic movement of real fish. The Panel method is applied to the hydrodynamic performance analysis innovatively, with the Gauss-Seidel method to solve the Navier-Stokes equations additionally, to evaluate the flexible deformation of fish in swimming accurately when satisfying the boundary conditions. A physical prototype to mimic the shape of tuna is developed with the revolutionized technology of rapid prototyping manufacturing. The hydrodynamic performance for rigid oscillating hydrofoil is analyzed with the proposed method, and it shows good coherence with the cases analyzed by the commercial software Fluent and the experimental data from robofish. Furthermore, the hydrodynamic performance of coupled hydrofoil, which consisted of flexible fish body and rigid caudal fin, is analyzed with the proposed method. It shows that the caudal fin has great influence on trailing vortex shedding and the phase angle is the key factor on hydrodynamic performance. It is verified that the shape of trailing vortex is similar to the image of the motion curve at the trailing edge as the assumption of linear vortex plane under the condition of small downwash velocity. The numerical analysis of hydrodynamics for bionic movement based on the Panel method has certain value to reveal the fish swimming mechanism.

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“…The model is the simplest and most widely used two-equation turbulence closure that solves two separate transport equations and provides an independent determination of the turbulent kinetic energy and its dissipation rate [19]. The Reynolds stress model (RSM) provides closure of the Reynolds-averaged Navier-Stokes equations for determining the Reynolds stresses by solving transport equations and providing the energy dissipation rate by another equation [20,21].…”

Section: Turbulence Modelsmentioning

confidence: 99%

“…Furthermore, it is confirmed that in turbulence flows, the small scales tend to be more homogeneous and isotropic than the large ones, and thus modeling the sub-grid scale motions is easier than modeling all scales of motions within a single model in the RANS approach. Therefore, currently LES is the most viable/promising numerical approach to simulate the realistic turbulent flows [21,22].…”

Section: Turbulence Modelsmentioning

confidence: 99%

Investigation of the Dynamics Bed Shear Stress Distribution around a Circular Cylinder Using Various Turbulences Models

Kardan¹,

Hakimzadeh²,

Hassanzadeh³

2017

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Abstract. Scouring around cylinders is greatly affected by the value of bed shear stress entered on sediment materials of the bed. Regarding the importance of the bed shear stress fluctuations and their influence on the initiation and development of scouring around cylinders, in this paper, the dynamic bed shear stress distributions around a circular cylinder in high Reynolds numbers flow is investigated using various turbulence closures. Since the bed shear stress can be regarded as one of the key parameters in scouring and erosion predictions, then the accurate calculation of this parameter would be the first step in scour prediction and calculation. As the vortex shedding at the downstream of a cylinder depends on the turbulence intensity of flow, a similar behavior may be anticipated for the dynamic bed shear stress. To evaluate the bed shear stress distribution, several numbers of numerical simulations are conducted to predict the bed shear stress using the CFD solver FLUENT. Various turbulence models of time-and space-averaged types are used to simulate the turbulence effects. Regarding the importance of the turbulence models in accurate simulation of the cylinder wake region, three models of , RSM and LES are evaluated using a comparison of the flow pattern and the fluctuation of near wake vortices. Results revealed that in the simulation with LES turbulence model, the wake remains very symmetrical, consisting primarily of two large vortices in the near wake at two sides of the cylinder. With time passing, a transition occurs between the two states, from the initially symmetrical to the asymmetrical. Also, comparing the critical bed shear stress pattern in different phases show that the bed shear stress is repeated again after a certain time period. This is in good agreement with the fluctuation time period of wake vortices.

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Numerical Investigation on Vortex Shedding from a Hydrofoil with a Beveled Trailing Edge

Cited by 9 publications

References 41 publications

Numerical Simulation on Vortex Shedding from a Hydrofoil in Steady Flow

Numerical Simulation on Vortex Shedding from a Hydrofoil in Steady Flow

Numerical Analysis of Hydrodynamics for Bionic Oscillating Hydrofoil Based on Panel Method

Investigation of the Dynamics Bed Shear Stress Distribution around a Circular Cylinder Using Various Turbulences Models

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