Chinese Journal of Theoretical and Applied Mechani ›› 2013, Vol. 45 ›› Issue (5): 782-786.DOI: 10.6052/0459-1879-12-213

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THE OSCILLATION MODE OF INCOMPRESSIBLE CAVITY FLOW

Li Huan1, Fang Tao2, Wu Fangliang1, Li Wanping2   

  1. 1. China Ship Development & Design Center, Wuhan 430060, China;
    2. Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2013-05-23 Revised:2013-08-14 Online:2013-09-23 Published:2013-10-23

Abstract:

The numerical calculation of the cavity flow using 2D-LES method has been conducted to examine how the momentum loss thickness and inflow velocity at the cavity leading edge affect the cavity flow oscillations, and how the length-to-depth ratio of the cavity is related to the oscillation modes of the cavity flow. PIV measurements of cavity flows verify the credibility of the results of numerical calculation. The results show that the friction velocity determines whether or not the flow of water over the cavity will oscillate. The instantaneous vortex structures and the cavity drag coefficients identify two typical modes of oscillation, the shear layer mode and wake mode. The key factor that determines the oscillation mode is the length-to-depth ratio of the cavity.

Key words:

incompressible|cavity flow|oscillation mode|large eddy simulation (LES)|particle image velocimetry (PIV)

CLC Number: