Numerical simulation is done for the investigation of the free surface effect on the cavity shape of a hydrofoil in shallow water. The air- vapor-water three phases flow around the hydrofoil is resolved using the scale adaptive simulation (SAS) method. The two interfaces, i.e. the air-water free surface and the vapor-water cavitation interface, are tracked simultaneously by the volume of fraction (VOF) method, with the cavity shape modeled by the Schnerr-Sauer's cavitation model. One two dimensional validation case for the hydrofoil with thickness D=16mm in a tunnel is presented, and then the validated method is used to simulate the cavitation flows around the same hydrofoil oriented with several attack angles (Ak = 2°, 5° and 8°) under various water depths (H=0.07m, 0.10m and 0.13m). The foil's drag coefficients, total vapor volumes and the cavity shapes of these free surface cases are compared and analyzed.

This content is only available via PDF.
You can access this article if you purchase or spend a download.