Wake Wash
We have developed a potential-flow method based on point hydrodyanmic sources for predicting
hydrodynamics of hard-chine hulls in transitional and early planing regimes.
The outcomes include pressure distribution on the hulls and the near-field wake wash.
Complicated hull forms can be modeled with this method, including multi-hulls,
multi-step configurations, asymmetric (or heeled) hulls, variable deadrise,
trim tabs, hydrofoils, and air-cavity hulls.
Lift coefficient (a) and center of pressure (b). Symbols, our numerical results; curves, Savistky's
empirical correlations. Different data sets correspond to aspect ratio of 1, 2, and 3.
The agreement between modeling and empirical results is good for beam Froude numbers in the range from 1 to 3.
Top view on calculated wave patterns around (a) flat plate and (b) 10-deg deadrise hull with trim angle 4 deg.
Brightness is proportional to the free water surface elevation. Wetted hull surfaces are outlined by white lines.
The wave hollow behind transom, elevated water surface in the rooster tail region, and divergent waves are predicted
well.
