The computational fluid dynamics modelling of the autorotation of square, flat plates

Hargreaves, David; Kakimpa, Bruce; Owen, J.S.

doi:10.1016/j.jfluidstructs.2013.12.006

Cited by 26 publications

(20 citation statements)

References 27 publications

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“…To validate the CFD-RBD model presented in this paper, a comparison is shown between the results of several LES models, the Auckland experiment data [42] and the RANS simulations performed by Hargreaves et al [43]. Comparisons for the lift and drag coefficients between the simulations and the experimental results can be seen in Fig.…”

Section: Model Validationmentioning

confidence: 98%

“…To provide a better match between the simulation and experimental condi-tions, a bearing friction submodel was implemented as suggested by Hargreaves et al [43]. This model adds a bearing friction torque, T f ric , to the aerodynamic torques already acting on the plate during the simulation.…”

Section: Cfd Modelmentioning

confidence: 99%

“…Alternatively, mass eccentricity, a possible inadequate bearing friction model and inaccuracies in the CFD-RBD simulation due to numerical limitation where the plate experiences stalled conditions may further affect the prediction of lift and drag forces. Also, it is important to note that this over-prediction can be attributed to the time averaging done for the experimental results, as it can be seen in solutions [43] still interact directly with the plates downstream pressure field. These vortexblade interactions [54] strongly couple turbulence closure models to the dynamic motion of the rigid body.…”

Section: Model Validationmentioning

confidence: 99%

“…In this paper, the flow around an autorotating flat plate is simulated, using several LES models, which was analyzed experimentally by Martinez-Vazquez et al [42] and previously simulated using RANS models by Hargreaves et al [43]. In this approach it is hypothesized that a turbulent eddy viscosity exists at the small scales and that the stresses are in equilibrium at the interface between the large and small scales.…”

Section: Introductionmentioning

confidence: 99%

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Large-eddy simulations of an autorotating square flat plate

Domenge

Velez

Das

2016

Applied Mathematical Modelling

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Large-eddy simulation (LES) turbulence models are underdeveloped in the area of fluid-structure interaction (FSI), specifically in autorotation applications. To gain a better understanding of FSI simulations, under the influence of strong turbulent interactions, several LES simulations were conducted to study the autorotation of a thin plate and compared to experimental measurements and RANS simulations found in literature. The plate is allowed to spin freely about its center of mass and is located near the center of a wind tunnel with a free stream velocity of 5 m/s. Wall effects from the wind tunnel enclosure are neglected. In this work, a coupled Computational Fluid Dynamics (CFD)-Rigid Body Dynamics (RBD) model is proposed employing the delayed-detachededdy simulation (DDES) and the Smagorinsky turbulence models to resolve the subgrid-scale stress (SGS). The qualitative prediction of vortex structures and the qualitative computation of pressure coefficients are in good agreement with experimental results. When compared to RANS, the results from the LES models provide better predictions of the pressure coefficient. Moreover, LES accurately captures the transient behavior of the plate and close correspondence is found between the predicted and measured moment coefficient.

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Section: Model Validationmentioning

confidence: 98%

Section: Cfd Modelmentioning

confidence: 99%

Section: Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Large-eddy simulations of an autorotating square flat plate

Domenge

Velez

Das

2016

Applied Mathematical Modelling

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“…Numerical modeling of gates has the goal of verifying the design of a specific hydraulic structure [18] or determining static support forces [19−20]. SHINDE et al [8] analyzed the fluidstructure interaction in a 4×5 cylinder in static conditions at moderate and high Reynolds number.…”

Section: Introductionmentioning

confidence: 99%

Modeling of fluid-induced vibrations and identification of hydrodynamic forces on flow control valves

Mehrzad

Javanshir

Ranji

et al. 2015

J. Cent. South Univ.

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Dynamics and vibration of control valves under flow-induced vibration are analyzed. Hydrodynamic load characteristics and structural response under flow-induced vibration are mainly influenced by inertia, damping, elastic, geometric characteristics and hydraulic parameters. The purpose of this work is to investigate the dynamic behavior of control valves in the response to self-excited fluid flow. An analytical and numerical method is developed to simulate the dynamic and vibrational behavior of sliding dam valves, in response to flow excitation. In order to demonstrate the effectiveness of proposed model, the simulation results are validated with experimental ones. Finally, to achieve the optimal valve geometry, numerical results for various shapes of valves are compared. Rounded valve with the least amount of flow turbulence obtains lower fluctuations and vibration amplitude compared with the flat and steep valves. Simulation results demonstrate that with the optimal design requirements of valves, vibration amplitude can be reduced by an average to 30%.

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From fluttering to autorotation bifurcation of a flat plate in a current

Rostami

Fernandes

2017

J Braz. Soc. Mech. Sci. Eng.

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This paper is dedicated to both the simulation of fluttering (oscillatory) and autorotation of a vertically hinged flat plate that may occur under the action of a fluid current and the experiments of the same vertical flat plate. Fluttering is defined as the oscillation of a body around an axis, whereas autorotation is a continuous rotational mode around the same axis. Both mentioned rotational motions occur without external power, and they are excited by the incident current. This paper describes the simulation of these phenomena by a nonlinear time domain code. The paper also considers the effect of mass moment of inertia on vortex shedding frequency and the resultant dynamics. The main inertia parameter (I*) is defined as the ratio between the mass moment of inertia and the added moment of inertia. It is shown that by increasing I*, fluttering bifurcates to autorotation at I* = 0.162, being the transition approximately independent of the current velocity, or of the corresponding Reynolds number. The results show that Strouhal number drops when fluttering translates to autorotation. Moreover, a method is proposed to calculate the theoretical extractable power from fluttering and autorotation using a phase diagram of angular acceleration versus velocity.

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The computational fluid dynamics modelling of the autorotation of square, flat plates

Cited by 26 publications

References 27 publications

Large-eddy simulations of an autorotating square flat plate

Large-eddy simulations of an autorotating square flat plate

Modeling of fluid-induced vibrations and identification of hydrodynamic forces on flow control valves

From fluttering to autorotation bifurcation of a flat plate in a current

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