I recently came across an intriguing Master’s thesis from Concordia University that investigates the impact of high dihedral angles on the stability of surface-piercing hydrofoils. The research, conducted using Simcenter STAR-CCM+, explores dihedral angles ranging from 30° to 50° and their effects on longitudinal, lateral, and directional stability. Key findings reveal that angles between 30°-40° offer optimal stability, while angles beyond 45° can lead to diminished stability and increased motion coupling, potentially causing oscillatory behavior.
The study’s significance lies in addressing a critical challenge for electric watercraft: limited battery range. Hydrofoils can significantly reduce drag by lifting the hull out of the water, thereby improving efficiency. However, maintaining stability at small operational altitudes (one-foot) in complex two-phase flow conditions is far more challenging than in traditional aircraft applications. This research provides validated guidelines for dihedral angle selection, directly supporting the electrification of maritime transport.
One particularly interesting aspect is the development of a complete CFD framework using Simcenter STAR-CCM+ with VOF modeling. This framework successfully captures complex air-water interface effects, such as ventilation and submergence, which are critical for surface-piercing hydrofoil design. By eliminating the need for expensive physical prototyping, this approach streamlines the early design stages and offers a cost-effective solution for manufacturers.
Overall, this research not only advances our understanding of hydrofoil dynamics but also provides practical tools for engineers and designers working on sustainable maritime solutions. It’s inspiring to see how computational methods are revolutionizing the way we approach complex fluid dynamics challenges.