Abstract No.C181018-273

Author name(s): Yong LI, Decheng WAN

Company: State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, China

NACA66 hydrofoil is often chosen as the blade section when designing propeller because of its low drag and high lift performance. In order to study the mechanism of the cavitation shedding and the flow structure around the NACA66 hydrofoil, the inter Phase-Change-Foam solver for incompressible and isothermal fluids with phase-change is used in this paper. An adapted SST k-ω turbulence model and the Schnerr-Sauer cavitation model have been implemented to analyze the hydrodynamic performance of the cavity flow, including lift coefficient, drag coefficient and shedding frequency. The numerical results obtained by simulation are compared with experiments. Cavity fluctuation has also been discussed and the shedding frequency presented by strouhal number falls within the expected range. According to the present paper, the evolution of cavitation shedding including cavitation growth, break-off and collapse is successfully simulated. Besides, a shock wave phenomenon as well as a re-entrance jet was found to be responsible for the cavity destabilization, which causes the lift and drag forces to oscillate with the periodic cavity shedding.

KEY WORDS: cavitation; NACA66 hydrofoil; shedding flow; modified turbulence model; OpenFOAM

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