Abstract
A numerical simulation was conducted on a propeller impacted by heave motion in cavitating flow using the Reynolds-averaged Navier-Stokes (RANS) method. The coupling of the propeller's rotation and translation was fulfilled using equations of motion defined for this purpose. The heave motion was simplified as a periodic motion based on a sinusoidal function. The numerical transmission of information from the unsteady flow field was achieved using the overset grid approach. In this manner, the unsteady thrust coefficient and torque coefficient of propellers in different cycles of heave motion were analyzed. A comparative study was implemented on the unsteady cavitation performance and wake characteristics of propeller. The results show that the heave motion intensifies the unsteady characteristic of thrust coefficient and torque coefficient, and leads to the non-uniform distribution of sheet cavitation. In addition, a smaller heave period results in a severe interference effect of the vortices structures and a remarkable propeller-induced fluctuating pressure amplitude. The results obtained from the numerical simulation are expected to serve as a useful theoretical reference for optimization of propeller designs.
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