Abstract
Cavity shedding of cavitating flows around an axisymmetric body belongs to the unsteady cavitating flows in the condition of steady incoming current. The periodic characteristics of unsteady cavitating flows around an axisymmetric body at small angles of attack are investigated experimentally and numerically. The evolution and shedding process of the three-dimensional sheet cavitation are computed numerically by the Reynolds averaged Navier-Stokes equations and the RNG k - ε model. The modification approach for eddy viscosity coefficient in the transition area of the two-phase flow is adopted to reproduce the shedding process of cavitating flows. The computed frequency of the cavity shedding coincides with the experimental data for the cases of unsteady cavitating flows around axisymmetric bodies with four headforms. Given the cavitation number, the shedding process of the cavitating flow depends heavily on the headform of the axisymmetric body. If the angle of attack of the axisymmetric body is greater than a critical value, the violent shedding of the sheet cavitation seems to be depressed.
References
Sakagami K., Kuwako H., Ito Y. et al. Behavior of the lift and the drag fluctuations on a foil in cavitation violent vibration [J]. Proc. of Japanese Society of Mechanical Engineers (B), 1990, 56(525): 1223–1229.
He Y. S., Liu H., Zhao G. A study on pulsation of twodimensional cavitating flow [J]. Acta Mechanica Sinica, 1997, 29(1): 1–7(in Chinese).
Arndt R. E. A., Song C. C. S. et al. Instability of Partial cavitation: A numerical/experimental approach [C]. The 23rd Symposium on Naval Hydrodynamics. Rouen, France, 2000.
Stinebring D. R., Billet M. L., Lindau J. W. Developed cavitation-cavity dynamics [R]. RTO EN-010, Brussels, Belgium: The von Kármán Institute (VKI), 2001.
Gnanaskandan A., Mahesh K. Numerical investigation of near-wake characteristics of cavitating flow over a circular cylinder [J]. Journal of Fluid Mechanics, 2017, 790: 453–491.
Liu H., He Y. S., Zhao G. A study on pulsation of axisymmetric cavitating flow [J]. Shanghai Journal of Mechanics, 1997, 18(2): 99–105(in Chinese).
Coutier-Delgosha O., Fortes-Patella R., Reboud J. L. Evaluation of the turbulence model influence on the numerical simulations of unsteady cavitation [J]. Journal of Fluids Engineering, 2003, 125(1): 38–45.
Orszag S. A., Yakhot V., Flannery W. S. et al. Renormalization group modeling and turbulence simulations [J]. Near-wall Turbulent Flows, 1993, 1031–1046.
Singhal A. K., Athavale M. M., Li H. et al. Mathematical basis and validation of the full cavitation model [J]. Journal of Fluids Engineering, 2002, 124(3): 617–624.
Wang Y. Y., Wang B. L., Liu H. Numerical simulation of sheet cavity shedding and cloud cavitation on a 2D hydrofoil [J]. Chinese Journal of Hydrodynamics, 2014, 29(2): 175–182(in Chinese).
Wan C., Wang B., Wang Q. et al. Probing and imaging of vapor-water mixture properties inside partial/cloud cavitating flows [J]. Journal of Fluids Engineering, 2017, 139: 031303–1.
Hu C. L., Wang G. Y., Huang B. et al. The inception cavitating flows over an axisymmetric body with a blunt headform [J]. Journal of Hydrodynamics, 2015, 27(3): 359–366.
Ma J. S., Hsiao C. T., Chahine G. L. A physics based multiscale modeling of cavitating flows [J]. Computers and Fluids, 2017, 145: 68–84.
Chen Y., Chen X., Li J. et al. Large eddy simulation and investigation on the flow structure of the cascading cavitation shedding regime around 3D twisted hydrofoil [J]. Ocean Engineering, 2017, 129: 1–19.
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Project supported by the National Natural Science Foundation of China (Grant Nos. 10972138, 11632012), the National Key Basic Research Development Program of China (973 Program, Grant No. 2013CB036102).
Biography: Chu-rui Wan (1985-), Male, Ph. D. Candidate
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Wan, Cr., Liu, H. Shedding frequency of sheet cavitation around axisymmetric body at small angles of attack. J Hydrodyn 29, 520–523 (2017). https://doi.org/10.1016/S1001-6058(16)60764-3
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DOI: https://doi.org/10.1016/S1001-6058(16)60764-3