Hydrodynamic modeling of planing hulls with twist and negative deadrise

• A method of hydrodynamic sources is applied for modeling non-prismatic planing hulls.
• Parametric calculations are carried out in a range of moderate Froude numbers.
• Hulls with twist and negative deadrise are analyzed.

Hulls of hard-chine planing boats often have complicated geometries. In this study, non-prismatic hulls with variable and negative deadrise angles are considered. The method of hydrodynamic sources is applied to model steady water flow around such hulls in the linearized approximation at finite Froude numbers. The solution includes pressure distribution on the hull surface which defines the lift force and center of pressure. For validation, modeling results are compared with an analytical solution for a flat plate and test data of a hull with a constant-deadrise section. Parametric calculations are carried out for a twisted hull at a fixed attitude and compared with an effectively similar prismatic planing surface in a range of Froude numbers. Non-prismatic hulls with variable aspect ratios are also investigated. In addition, results are presented for two hulls having positive and negative deadrise angles.