Design Optimization of Subcavitating Hydrofoils for America's Cup Class Yachts

Currently, conducting an optimization loop for this process is not feasible. Instead, we limit the pressure in the airfoil to remain below the known vapor pressure. This approach prevents cavitation, which occurs when the pressure falls below a certain threshold.

The relationship between cavitation and pressure can be visualized through a graph. On the left side of the graph, we observe the minimum coefficient of pressure (Cpmin), which indicates the onset of cavitation. To the left of this boundary, cavitation occurs, while to the right, it does not.

Furthermore, we can translate pressure values into corresponding speeds. This allows us to plot the lift coefficient (CL) against cavitation speed. It is crucial to remain on the left side of the cavitation boundary, as the right side represents cavitation conditions.

Through optimization, we can modify the shape of the cavitation bucket, which illustrates the relationship between loading and wing size or foil design. This bucket has two critical components that define its characteristics.