Numerical study on the bubbly flow around a hydrofoil in pitching and heaving motions

Abstract

The air-water bubbly flow around a hydrofoil of NACA65-010, undergoing the heaving and pitching motions in the uniform flow on a horizontal plane, is simulated by an incompressible two-fluid model. The finite element method proposed in a prior paper is applied to solve the model. The Reynolds number defined by the volumetric velocity of the water is 10000 and the volumetric fraction of the air upstream of the hydrofoil, α_g0, ranges from 0 to 0.06. The simulation reveals the effects of the α_g0 value, the phase difference between the heaving and pitching motions, and the oscillating frequency. The propulsive performance is also discussed in relation to the time variation of the flow properties around the hydrofoil.

Keywords

numerical simulation oscillating hydrofoil gas-liquid two-phase flow two-fluid model finite element method

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