Free-Surface Proximity Effects in Developed and Super-Cavitation

Kinzel, Michael P.; Lindau, Jules W.; Kunz, Robert F.

doi:10.1109/dod.hpcmp.ugc.2008.65

Cited by 8 publications

(7 citation statements)

References 12 publications

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“…Their results show that for angle of attacks bellow the stall condition, 2D and 3D results agrees suitably for the lift coefficient, general cavity development, stability, and cavity size. They showed that surface pressure distributions of the 2D case are consistent with the three dimensional predictions, especially away from the tip [37]. Qin et al [40,41] and Arndt [42] considered 2D LES simulation of cavitating flow over hydrofoil and physical results were obtained for classification of vortex shedding mechanism in sheet/cloud cavitation regimes.…”

Section: A Note On 2d Les Simulationmentioning

confidence: 57%

“…The key reason for employing 2D LES in the current work is the large computational cost of 3D LES simulation. 3D LES simulation typically needs large computational resources [37][38][39]. Therefore, like some other researches, i.e., Refs.…”

Section: A Note On 2d Les Simulationmentioning

confidence: 99%

“…Accuracy of 2D LES had also been reported in the literature. For example, Kinzel et al [37,38] provided a comparison between 2D and 3D LES simulations of cavitating flow over hydrofoils. Their results show that for angle of attacks bellow the stall condition, 2D and 3D results agrees suitably for the lift coefficient, general cavity development, stability, and cavity size.…”

Section: A Note On 2d Les Simulationmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Simulation of Cavitation around a Two-Dimensional Hydrofoil using VOF Method and LES Turbulence Model

Roohi

Zahiri²,

Pasandidehfard³

2012

Proceedings of the 8th International Symposium on Cavitation

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In this paper simulation of cavitating flow over the Clark-Y hydrofoil is reported using the large eddy simulation (LES) turbulence model and volume of fluid (VOF) technique. We applied an incompressible LES modelling approach based on an implicit method for the subgrid terms. To apply the cavitation model, the flow has been considered as a single fluid, two-phase mixture. A transport equation model for the local volume fraction of vapour is solved and a finite rate mass transfer model is used for the vapourization and condensation processes. A compressive volume of fluid (VOF) method is applied to track the interface of liquid and vapour phases. This simulation is performed using a finite volume, two phase solver available in the framework of the OpenFOAM (Open Field Operation and Manipulation) software package. Simulation is performed for the cloud and super-cavitation regimes, i.e., r = 0.8, 0.4, 0.28. We compared the results of two different mass transfer models, namely Kunz and Sauer models. The results of our simulation are compared for cavitation dynamics, starting point of cavitation, cavity's diameter and force coefficients with the experimental data, where available. For both of steady state and transient conditions, suitable accuracy has been observed for cavitation dynamics and force coefficients.

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Section: A Note On 2d Les Simulationmentioning

confidence: 57%

Section: A Note On 2d Les Simulationmentioning

confidence: 99%

Section: A Note On 2d Les Simulationmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation of Cavitation around a Two-Dimensional Hydrofoil using VOF Method and LES Turbulence Model

Roohi

Zahiri²,

Pasandidehfard³

2012

Proceedings of the 8th International Symposium on Cavitation

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show abstract

“…There is no additional dissipation for the central difference format, so it is well suited for LES to discretize the diffusion flux. The main reason for 2D LES was chosen in this paper instead of 3D LES is that the large computing resources were required in 3D simulation [54][55][56]. Many other researchers [55,[57][58][59] have also conducted many studies based on 2D LES, and the accuracy of 2D LES had also been reported in the literature.…”

Section: Methodsmentioning

confidence: 99%

The Transient Flow behind an Instantaneously Started Circular Cylinder with Two Symmetrical Strips

Zhou¹,

Jin²,

Ye³

et al. 2020

Applied Sciences

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The finite volume method, based on the dynamic mesh method, is used to investigate the transient viscous incompressible flow around an impulsively and translationally started cylinder with strips. The strips of different shapes are installed at different locations on the surface of the cylinder. The main purpose of this paper is to investigate the influence of the locations and shapes of strips on the flow caused by boundary motion. The present solutions agree well with the experimental results reported in literature. Six placement angles of strips were selected: 0°, 20°, 60°, 90°, 120° and 150°. The development of wake shows some new phenomena with different strip locations, and the significant difference appears at α = 90°. The vortex intensity is much larger than that of other locations. On the other hand, four shapes of strips were selected: arc, triangle, rectangle and trapezoid. The rectangular strips had the greatest influence on the drag coefficient and the maximum of the drag coefficient increased from 0.4 to 2.8, compared with the smooth cylinder. The maximum of negative velocity had the most significant change when the shape of strip is arc, increasing by 34% compared with the smooth cylinder, at T = 3.

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“…In this case the body will suffer only half drag when the cavitation number is near zero [9]. Using computationally supercavitating flow, Owis et al considered the compressibility of supercavitating flow and improved a numerical method for both single and multi-phase flows [10][11][12]. Drag force for NACA66 foil and a flat plate was investigated by Seif and the CFD model was successfully tested [13].…”

Section: Introductionmentioning

confidence: 99%

Research on hydrodynamic properties of annular cavitator with water injection

Jiang¹,

Xiang²,

Lin³

et al. 2012

Polish Maritime Research

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Annular cavitator with water injection is one of the key parts of the long-range supercavitating vehiclepowered by water ramjet. In this paper, hydrodynamic properties of annular cavitator are studiednumerically. The standard k ~ ε turbulence model is coupled with the Reynolds Averaged Navier-Stokes(RANS) equations to model the natural supercavitation process. The multiphase flow is considered asa mixture of varying density and modeled by the mass exchange equations. To fully understand this process,numerical simulations were performed for different annular cavitators. Computational Fluid Dynamics(CFD) results, including the pressure distribution and forces acting on the cavitator surface, mass flowand pressure loss of water injection, various supercavity sizes, were obtained and analyzed. The pressuredistribution on the cavitator surface was significantly changed which resulted in 4 ~ 6% increase of thetotal drag of the vehicle. The results show that the mass flow and velocity of the injection water is mainlydependent on the tube size, while the total pressure loss of the water injection is mostly related to the outletpressure. Supercavity generated by annular cavitator is smaller than that of the discal one. Based on thecorrelation analysis of the supercavity size and other factors, it could be concluded that the contraction ofthe cavity size is mainly caused by the diffluent mass flow of the water injection.

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Free-Surface Proximity Effects in Developed and Super-Cavitation

Cited by 8 publications

References 12 publications

Numerical Simulation of Cavitation around a Two-Dimensional Hydrofoil using VOF Method and LES Turbulence Model

Numerical Simulation of Cavitation around a Two-Dimensional Hydrofoil using VOF Method and LES Turbulence Model

The Transient Flow behind an Instantaneously Started Circular Cylinder with Two Symmetrical Strips

Research on hydrodynamic properties of annular cavitator with water injection

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