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We are doing a CFD project and are going to calculate lift and drag in 3D (SolidWorks flow simulation) for a symmetric NACA0015 surface-piercing hydrofoil wing and would like to get ideas for design improvements. The hydrofoil wing section has a chord of 220 mm at the top and 110 mm at the bottom where a fillet radius of 4 mm has been applied. Please contribute. The foil is intended to be pitchable so the lift force and normal force can be altered during operation of the craft. The pitchin is attached via a shaft at the hydrofoil longitudinal axis. As a start, the foil will be tilting 30 degr to the vertical and the water surface be at the mid of the hydrofoil. Total length is 1.6 m.
At the strart, the foil needs to provide lift to lift the hull out of the water. Then it needs to compensate for wind forces, i.e. just as on a foiling catamaran.
CAD-file can be downloaded via link if there is interest.
Hi Brian. Here is the link:
This is a very simple first version. I can upload new versions when available. This foil will operate very much like a surface piering hydrofoil on a foiling racing catamaran. At present I generate the profiles using a very convenient app in Fusion 360. I export as dxf and use than in Solidworks to generate hydrofoil sections. Solidworks tool "curve from xyz points" is very sensitive to data format and I've had some problems getting that to work satisfactorily.
The challenge is not so much on the SolidWorks modelling side of things. The challenge is rather to design the overall geometry of the foil to attain a static buoyancy curve (stability curve) suitable for the application. In this case it will (as a start) be mounted at 30 degrees to the vertical. It needs to have a static buoyancy at about 75% foil submergence (draft) corresponding to 11.5 kg. Thereafter I want to quantify the energy and power needed to to get to foiling height which is 50% draft at still water. The foil need to provide lift to compensate for sideways wind forces (as on the catamaran sail) on the overlying structure. The 30 degree inclination is chosen to be able to provide adjustable vertical as well as sideways lift through pitching of the hydrofoil.
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