Ventilated cloud cavitating flow around a blunt body close to the free surface

Wang, Yiwei; Xu, Chang; Wu, Xiaocui; Huang, Chenguang; Wu, Xiaqing

doi:10.1103/physrevfluids.2.084303

Cited by 48 publications

(12 citation statements)

References 33 publications

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“…When the model is sufficiently close to the free surface, the re-entrant jet on the upper side is very thin and does not have a sufficient strength to remove the cavity. Thus, several fluctuations of the cavity shape are found on the upper side; however, no shedding occurs [27] . The thin re-entrant jet also induces a stable cavity when the blunt body moves close to the free surface.…”

Section: The Effect Of Free Surface On Re-entrant Jet Thickness and Vmentioning

confidence: 92%

“…The water temperature is approximately 20 o C. In the following sections, the cavity evolution will be mainly discussed based on experimental pictures and numerical results. The cavity shape changes with the submerged depth at the launch time, the cavitation phenomenon can be classified by the shape development into the cloud cavitation [13] , the natural ventilation [27] and the supercavitation as the submerged depth decreases. We mainly focus on the cloud cavitating flow in this paper with the submerged depth varying from 15 mm to 40 mm.…”

Section: Water Tank Experimentsmentioning

confidence: 99%

“…In this study, various submerged depths (15 mm, 20 mm, 25 mm, 30 mm and 40 mm) are considered to analyze the cavity stability and the asymmetry, the re-entrant jet thickness, and the velocity with the free surface effect. If the submerged depth is reduced, a natural ventilation will occur [27] .…”

Section: Mesh Independence Studymentioning

confidence: 99%

“…The CFD simulations were conducted, and the results were found to be consistent with the water tank experiment data. Moreover, the atmospheric ventilation flow around a blunt body near the free surface was discussed [27] . Ventilated cavitation occurs when the model is sufficiently close to the free surface.…”

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confidence: 99%

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The effect of free surface on cloud cavitating flow around a blunt body

Wang

Huang

et al. 2017

J Hydrodyn

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Abstract:In this study, the effect of the free surface on the cloud cavitating flow around a blunt body is investigated based on the water tank experiment and the CFD method. Numerical results are in good agreement with experimental data, and the mesh independence of the methods is verified. The cavity evolution process includes the cavity growth, the re-entrant jet, the cavity shedding, and the collapse, which can all be observed from the water tank experiment. The effects of the free surface on the cavity length, the thickness, and the cavity evolution period are analyzed by comparing the difference between the cavitating flows on the upper and lower sides of the body. This study also examines the effect of the distance between the free surface and the model through a series of water tank experiments and numerical simulations. The cavity stability and asymmetry, as well as the thickness and the velocity of the re-entrant jet inside the cavity, which varies with the submerged depth, are discussed with consideration of the effect of the free surface. The effect of the free surface on the cavitating flow around the blunt body is enhanced with the decrease of the submerged depth.

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Section: The Effect Of Free Surface On Re-entrant Jet Thickness and Vmentioning

confidence: 92%

Section: Water Tank Experimentsmentioning

confidence: 99%

Section: Mesh Independence Studymentioning

confidence: 99%

mentioning

confidence: 99%

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The effect of free surface on cloud cavitating flow around a blunt body

Wang

Huang

et al. 2017

J Hydrodyn

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“…Cavitation can cause serious problems in fluid machinery, such as pressure fluctuations, noise, vibration, and corrosion. Therefore, cavitating flows continue to be widely studied [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Temperature on the Temporal and Spatial Distribution Characteristics of Natural Cavitating Flow around a Vehicle

Sun

Zhang

et al. 2020

JMSE

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Cavitation involves complex multiphase turbulence and has important research significance. In this study, the Schnerr–Sauer cavitation model was used to model cavitation, and the detached-eddy simulation (DES) method was used to calculate the unsteady natural cavitating flow. The predicted results are in good agreement with experimentally measured cavity evolution and pressure values, demonstrating the effectiveness of this numerical method. Low temperature causes changes in the properties of water. The density of water at 0° is 999.84 kg/m3 and the density of water at 25° is 997.04. Cavitation evolution and shedding are analyzed at temperatures of 0 °C and 25 °C. The results showed that lower temperature increased the frequency of cavitation and enhanced pressure pulsation. At the same time, low temperature also increases the frequency of cavity shedding and shortens the cycle. In addition, based on the Ω method, the difference between vortex dynamics at various temperatures was studied, and it was found that different cavity stages showed different vortex structure characteristics, and lower temperature would aggravate the change of wake vortex structure. At the same time, the analysis of the turbulence characteristics in the downstream of the cavity shows that the lower temperature reduces the velocity pulsation and reduces the turbulence integral scale. At the end of the model, large-scale pulsations are transformed into small-scale pulsations.

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Lagrangian-based numerical investigation of aerodynamic performance of an oscillating foil

Zhang

Huang

et al. 2018

Acta Mech. Sin.

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Ventilated cloud cavitating flow around a blunt body close to the free surface

Cited by 48 publications

References 33 publications

The effect of free surface on cloud cavitating flow around a blunt body

The effect of free surface on cloud cavitating flow around a blunt body

Study on the Influence of Temperature on the Temporal and Spatial Distribution Characteristics of Natural Cavitating Flow around a Vehicle

Lagrangian-based numerical investigation of aerodynamic performance of an oscillating foil

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