Large eddy simulation and Euler–Lagrangian coupling investigation of the transient cavitating turbulent flow around a twisted hydrofoil

Long, Xinping; Cheng, Huaiyu; Ji, Bin; Arndt, Roger E. A.; Peng, Xiaoxing

doi:10.1016/j.ijmultiphaseflow.2017.12.002

Cited by 183 publications

(37 citation statements)

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“…where F c and F e are two empirical coefficients for the condensation and vaporization processes, and α nuc and R B respectively represent the volume fraction and the radius of the nucleation sites. These empirical constants in the ANSYS CFX (18.0 Version, ANSYS, Canonsburg, PA, USA) software [40] are set to F c = 0.01, F e = 50, α nuc = 5 × 10 −4 , and R B = 1 × 10 −6 m. The Zwart cavitation model has been widely used to simulate cavitating flows, and more descriptions about this popular numerical method can be found in [41][42][43][44]. Brief introductions of the simulation cases are listed in Table 1.…”

Section: Numerical Methods and Validationmentioning

confidence: 99%

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Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Chen²,

Yang

et al. 2018

Energies

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In this paper, the turbulent attached cavitating flows around two different twisted hydrofoils, named as NACA0009 and Clark-y, are studied numerically, with emphasis on cavity shedding dynamic behavior and the turbulence flow structures. The computational method of large eddy simulation (LES) coupled with a homogeneous cavitation model is applied and assessed by previous experimental data. It was found that the predicted results were in good agreement with that of the experiment. The unsteady cavity morphology of the two hydrofoils undergoes a similar quasi-periodic process, but has different shedding dynamic behavior. The scale of the U-type shedding structures forming on the suction surface of NACA0009 is larger than that of Clark-y. This phenomenon is also present in the iso-surface distributions of Q-criterion. Otherwise, the time-averaged cavity morphology is dramatically different for the two hydrofoils, and it is found that the attached location of the cavity is closely related to the hydrofoil geometry. The time fluctuation of the lift force coefficients is affected significantly by the cavity shedding dynamics. Compared with NACA0009, the lift force of Clark-y shows more fluctuation, due to its complicated shedding behavior. Further analysis of the turbulent structure indicates that the more violent shedding behaviors can induce higher levels of turbulence velocity fluctuations.

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Section: Numerical Methods and Validationmentioning

confidence: 99%

“…The definition of y + can be written as Equation (15). According to the previous comments for a valid LES method [37,44], a medium mesh with about 3.5 million nodes was selected as the final grid.…”

Section: Numerical Methods and Validationmentioning

confidence: 99%

Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Chen²,

Yang

et al. 2018

Energies

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“…Ahn et al (2018) carried out unsteady simulation using a modified RNG k-ε model. Long et al (2018) coupled large eddy simulation with Euler-Lagrangian method to investigate on the transient cavitating process.…”

Section: Introductionmentioning

confidence: 99%

Unsteady dynamic analysis for the cavitating hydrofoils based on OpenFOAM

Xiang

Zhou

Yang

2019

Exp. Comput. Multiph. Flow

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Recently, cavitation has attracted great attention not only due to its negative effect on the performance of fluid machinery, but also owing to its vigorous prospect in drag reduction for underwater vehicles. However, strong instability and obvious nonlinearity exist for cavitating flow, making it hard to predict it precisely. In this paper, a cavitating solver coupled with the Bubble-Droplet cavitation model has been established based on the OpenFOAM platform. Simulation has been carried out for the cavitating hydrofoil of Clark-Y. Transient evolutions of the flow parameters including the void fraction, velocity, and pressure have been obtained, giving detail insights on the unstable shedding dynamics for the cavitating hydrofoil. Evaluation of the Bubble-Droplet cavitation model has been implemented by varying the threshold value in the model. The transient cavity shape, shedding frequency, and time-dependent curves for the hydrodynamic coefficient have been carefully compared, indicating that this threshold value has obvious effect on the cavity profile during the shedding process. By comparing with the experimental data, the predicted lifts are slightly under-predicted while the drags are overpredicted, but basically the numerical results agree with the experiment well.

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“…They reported that the LCSs provide a powerful visualization tool that can be used to reveal the vortex street in the cylinder's wake. Recent studies successfully implemented the Lagrangian method to investigate the cavitating turbulent flows around hydrofoil [18,19,20,21]. Cheng et al [18] and Long et al [19] identified two and three-dimensional FTLE fields, respectively, to analyze turbulent flows around the Delft twisted hydrofoil.…”

mentioning

confidence: 99%

“…Their results showed a very good correlation between the FTLE and the Eulerian vortex identification techniques. The three-dimensional LCSs [19] provides a promising visualization alternative to study the vortex dynamics in turbulent flows. Tseng & Liu [20] and Cheng et al [21] implemented the Lagrangian approach to study the dynamics of the cavitating turbulent flows over the ClarkY hydrofoil.…”

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confidence: 99%

Vortex identification in turbulent flows past plates using the Lagrangian method

et al. 2019

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Vortex identifications in turbulent flows past arrays of tandem plates are performed by employing the velocity field obtained by high-fidelity large eddy simulations. Lagrangian coherent structures (LCSs) are extracted to examine the evolution and the nonlinear interaction of vortices and to characterize the spatial and temporal characteristics of the flow. LCSs’ identification method is based on the finite-time Lyapunov exponent (FTLE), which is evaluated using the instantaneous velocity data. The simulations are performed in three-dimensional geometries to understand the physics of fluid motion and the vortex dynamics in the vicinity of plates and surfaces at Reynolds number of 50 000. The instantaneous vorticity fields, Eulerian Q-criterion, and LCSs are presented to interpret and understand complex turbulent flow structures. The three-dimensional FTLE fields provide valuable information about the vortex generation, spatial location, evolution, shedding, decaying, and dissipation of vortices. It is demonstrated here that FTLE can be used together with Eulerian vortex identifiers to characterize the turbulent flow field effectively.

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Large eddy simulation and Euler–Lagrangian coupling investigation of the transient cavitating turbulent flow around a twisted hydrofoil

Cited by 183 publications

References 50 publications

Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Large Eddy Simulation of Turbulent Attached Cavitating Flows around Different Twisted Hydrofoils

Unsteady dynamic analysis for the cavitating hydrofoils based on OpenFOAM

Vortex identification in turbulent flows past plates using the Lagrangian method

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