Eulerian two-phase modeling of cavitation for high-speed UUV using different turbulence models

Li, Linmin; Jia, Qingquan; Liu, Zhongqiu; Li, Baokuan; Hu, Zhiqiang; Yang, Lin

doi:10.1109/cyber.2015.7288122

Cited by 4 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Computational fluid dynamics (CFD), which has been integrated into commercial software FLUENT and CFX [5][6][7] as well as into open-source [8][9][10][11] and in-house [12][13][14][15][16] software, has been recently introduced as a major approach for investigating cavitation. The cavitating flow of the unsteady cloud around the foil [17][18][19], propeller models [20], and other underwater vehicles [7,21] presents typical problems.…”

Section: Introductionmentioning

confidence: 99%

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Wang

Huang

et al. 2017

Journal of Fluids Engineering

View full text Add to dashboard Cite

Unstable cavitation presents an important speed barrier for underwater vehicles such as hydrofoil craft. In this paper, the authors concern about the physical problem about the cloud cavitating flow that surrounds an underwater-launched hydrofoil near the free surface at relatively high-Froude number, which has not been discussed in the previous research. A water tank experiment and computational fluid dynamics (CFD) simulation are conducted in this paper. The results agree well with each other. The cavity evolution process in the experiment involves three stages, namely, cavity growth, shedding, and collapse. Numerical methods adopt large eddy simulation (LES) with Cartesian cut-cell mesh. Given that the speed of the model changes during the experiment, this paper examines cases with varying constant speeds. The free surface effects on the cavity, re-entry jet location, and vortex structures are analyzed based on the numerical results.

show abstract

Section: Introductionmentioning

confidence: 99%

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Wang

Huang

et al. 2017

Journal of Fluids Engineering

View full text Add to dashboard Cite

show abstract

Supercavitating flow around high-speed underwater projectile near free surface induced by air entrainment

Huang

Wang

et al. 2018

AIP Advances

View full text Add to dashboard Cite

Cavitating flow near free surface is a complicated issue and may provide new inspiration on high-speed surface cruising. This study observes stable supercavitating flow as a new phenomenon in a launch experiment of axisymmetric projectile when the upper side of the projectile coincides with the free surface. A numerical approach is established using large eddy-simulation and volume-of-fluid methods, and good agreements are achieved between numerical and experimental results. Supercavity formation mechanism is revealed by analyzing the experiment photographs and the iso-surface of 90% water volume fraction in numerical results. The entrainment of a large amount of air into the cavity can cause the pressure inside the cavity to similarly increase with the pressure outside the cavity, which makes the actual cavitation number close to zero and is similar to supercavitation. Cases with various headforms of the projectile and cavitation numbers on the cavitating flow, as well as the drag reduction effects are further examined. Results indicate that the present strategy near the free surface could possibly be a new effective approach for high-speed cruising after vigorous design optimization in the future.

show abstract

Dynamics of the supercavitating hydrofoil with cavitator in steady flow field

Khoo

2020

Physics of Fluids

View full text Add to dashboard Cite

Maintaining stability remains a crucial issue for the safety of underwater vehicles, especially during high-speed navigation where flow cavitation may occur. Cavitators are small protrusions on the hydrofoil surface, which can be used to control the patterns of flow cavitation. In this study, we investigate the effect of cavitators on supercavitating flow and hydrodynamic forces for high-speed hydrofoil. The volume of fluid method and the large eddy simulation turbulence model with the Kunz cavitation model are used in the simulations in order to accurately capture the interface between two phases (water and vapor) and the region of flow supercavitation. To validate the numerical method, the time-averaged simulated results of the supercavitating flow over a wedge-shaped hydrofoil are compared and validated against the experimental data by Kermeen (“Experimental investigations of three-dimensional effects on cavitating hydrofoils,” Technical Report No. 47-14, Engineering Division of the California Institute of Technology, Pasadena, CA, 1960). Then, the numerical method is used to simulate the supercavitating flow of two-dimensional and three-dimensional cases with and without the cavitator placed on the lower side of the hydrofoil. The simulations were conducted for the cavitator located at the 1/32, 1/16, 1/8, and 1/4 chord of the hydrofoil at various angles of attack 1°–12° and cavitation numbers at 0.1, 0.2, and 0.4. A detailed analysis is made to examine the relations between cavitation pattern, hydrodynamic forces, and cavitator placement location. Compared to the cases without the cavitator, the supercavitating flow over the hydrofoils controlled by the cavitator demonstrates a significant difference in lift, whereas the drag does not change much. The changes in lift are closely related to the cavitator location. These findings can serve as a good guidance on how to improve the hydrodynamic performance and stability condition of a high-speed hydrofoil/wing using the cavitator.

show abstract

Eulerian two-phase modeling of cavitation for high-speed UUV using different turbulence models

Cited by 4 publications

References 14 publications

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Supercavitating flow around high-speed underwater projectile near free surface induced by air entrainment

Dynamics of the supercavitating hydrofoil with cavitator in steady flow field

Contact Info

Product

Resources

About