Two-Way Fluid-Structure Coupling in Vibration and Damping Analysis of an Oscillating Hydrofoil

Liaghat, T.; Guibault, François; Allenbach, L.; Nennemann, Bernd

doi:10.1115/imece2014-38441

Cited by 26 publications

(15 citation statements)

References 18 publications

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“…The second case is an FSI problem with the global uniformity mesh type and using the classical case of an elastic plate vibration. 24 The initial undeformed mesh is shown in Figure 4; the flow field has 2.48 Â 10 4 nodes and 4.91 Â 10 4 triangular elements and the elastic plate structure is modeled with 28 red labels. Prior to the vibration, the unstressed elastic plate is end-fixed with a nondimensional height of 1.0, a width of 0.4, a density of 2550 kg/m 3 , Young's modulus of 2.5 MPa, a Poisson's ratio of 0.35, and a kinetic viscosity of 0.2.…”

Section: Fsi Problemmentioning

confidence: 99%

Integrated improvement of the elasticity-based mesh deformation method based on robust parameters and mesh quality

Zhang

Feng

Yang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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Highly robust mesh deformation methods are key techniques for solving unsteady flow field problems with moving or deforming boundaries. Because it is imperative to reduce the remeshing times, these methods are important in engineering applications, especially for complex geometric boundaries and large displacements. We introduce three classical elasticity-based mesh deformation methods and determine the limitations of the two nonlinear classical methods. Two steps were taken to achieve an integrated improvement: first, the robust power parameters a and b and the weighted parameter x are introduced to enhance the robustness of the basic elasticity equation. Second, a mesh quality parameter is implemented to prevent the large distortion of the poor elements and this parameter is added to the elasticity equation as a constraint. To validate the validity of the integrated improvement approach, several test cases of a moving or deforming two-dimensional flat plate are used. Additionally, two simulated engineering examples are used to demonstrate the application of the integrated improvement for practical problems, including the pitching oscillation of a National Advisory Committee for Aeronautics (NACA) 0012 airfoil and the ONERA M6 wing. The results show that the integrated improvement approach does not only allow for the selection of suitable robust parameters to achieve more robust deformed meshes but also reduces the distortion of the poor elements near the moving boundary, even when the deformation is severe.

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Section: Fsi Problemmentioning

confidence: 99%

Integrated improvement of the elasticity-based mesh deformation method based on robust parameters and mesh quality

Zhang

Feng

Yang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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show abstract

“…The NWT simulations are made with different assumptions in CFD programs. Waves with certain qualities can be created using simulations [6]. In a study by Liu et al, a numerical simulation with Reynolds-Averaged-Navier-Stokes (RANS) equation is done for two-dimensional NWT modeling utilizing the Volume of Fluid (VOF) approach [7].…”

Section: Introductionmentioning

confidence: 99%

Using computational fluid dynamics for wave generation and evaluation of results in numerical wave tank modelling

Yamaç¹,

Koca²,

Yılmaz³

2022

FUJECE

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In this paper, computational modeling of wave generation and evaluation of results are given. The analysis of Computational Fluid Dynamics is performed in the ANSYS Fluent module. The model of numerical analysis is made time-dependent. The Numerical Wave Tank is an engineering research equipment for studying sea waves that requires the least amount of people and materials. The Numerical Wave Tank may be used to simulate the motion of the ocean and sea waves with a modeled moving wall as a wave-maker. To generate regular gravity waves, a Numerical Wave Tank based on Reynolds Averaged Navier Stokes equations and the Volume of Fluid technique is modeled using Dynamic Mesh Technique. Wave heights, water depths, wavelength and wave periods are chosen variable parameters. Water volume fraction, velocities, turbulence kinetic energy and dynamic pressure are evaluated results. A brief explanation of how to generate waves influence is made.

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“…They concluded that this approach is suitable for the prediction of the vibration amplitude with a maximum deviation of around 8.82% for the hydrodynamic damping. Liaghat et al [25] also studied the dynamic response of the first bending mode of a hydrofoil by using two-way FSI simulations. They numerically found the linear relationship between the hydrodynamic damping and the free-stream velocity.…”

Section: Introductionmentioning

confidence: 99%

“…In summary, most of the literature related to the study of hydrofoils under vortex shedding flows deals with: (i) the prediction of the vortex shedding frequency for free-wake cavitation conditions [12,15,16,[29][30][31][32], (ii) the influence of the wake cavitation on the vortex shedding dynamic behavior [4,[20][21][22][23], and (iii) the prediction of the vibration amplitudes of hydrofoil under lock-off and lock-in conditions when no wake cavitation occurs [17,[24][25][26][27][28]. However, solely Ausoni et al [6] experimentally studied the interaction between wake cavitation and the dynamic response of a hydrofoil under a lock-in condition.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Influence of Wake Cavitation on the Dynamic Response of Hydraulic Profiles under Lock-In Conditions

et al. 2021

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To accelerate the integration of fluctuating renewable energy technologies in the power systems, it is necessary to increase the flexibility of hydropower by operating turbines at off-design conditions. Unfortunately, this strategy causes deleterious flow phenomena such as von Kármán’s vortices at the wake of the vanes and/or blades. When their shedding frequency lies in the vicinity of a structure’s natural frequency, lock-in occurs and vibration amplitudes increase significantly. Moreover, if cavitation occurs at the centers of these vortices, the structure’s dynamic response will be modified. In order to understand this interaction and to avoid its negative consequences, the vibration behavior of a NACA 0009 hydrofoil under a torsional lock-in condition was numerically simulated for cavitation-free and cavitating-flow conditions. The results showed that the presence of vortex cavitation modified the formation and growth process of shed von Kármán vortices in the near-wake region which, in turn, caused an increase of the work performed by the hydrofoil deformation on the surrounding flow and a sharp decrease of the maximum vibration amplitude under resonance conditions.

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Two-Way Fluid-Structure Coupling in Vibration and Damping Analysis of an Oscillating Hydrofoil

Cited by 26 publications

References 18 publications

Integrated improvement of the elasticity-based mesh deformation method based on robust parameters and mesh quality

Integrated improvement of the elasticity-based mesh deformation method based on robust parameters and mesh quality

Using computational fluid dynamics for wave generation and evaluation of results in numerical wave tank modelling

Understanding the Influence of Wake Cavitation on the Dynamic Response of Hydraulic Profiles under Lock-In Conditions

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