@article{Interaction:11107,
      author = {Knight, J and Ledger, T and McConnell, M and Azcueta, R},
      url = {http://library.imarest.org/record/11107},
      journal = {Conference Proceedings of ICMET},
      title = {Fluid Structure Interaction of Hydrofoils},
      abstract = {Hydrofoils are used in the marine industry to produce  enough lift to raise the boat and crew out of the water,  therefore reducing resistance on the hull and enabling  increased speeds. The interaction between the hydrofoil and  water puts severe stress and strain on the hydrofoil.  Fluid-structure interaction (FSI) is a multi-physics  coupling of both fluid dynamics and structural mechanics  into one simulation. When a fluid flow interacts with a  structure, stresses and strains are applied within the  structure which can lead to a deformation, which can change  the flow field, giving a revised pressure loading. This  change in pressure loading can lead to either an increase  or decrease in lift, which is dependant on the location of  the elastic axis of the hydrofoil. If the pressure loading  is increased and left unchecked, the deformation could lead  to failure of the structure. A symmetrical hydrofoil is  studied and good agreement to within 1% variation in  pressure is found between the simulated fluid and  experimental results found in literature. Good agreement is  essential for FSI as any differences can be amplified in  subsequent iterations of the FSI. The FSI effects of lift  are reported with varying material properties for the  NACA0012 hydrofoil. The lift was found to be highly  dependent on structural rigidity. The FSI effects are  reported for a particular case with a tip deflection of  45cm which is 23% of span. This results in an increase of  lift by a factor of 19%, although much larger deformations  are possible. In addition, the effects of an FSI on the  more complex geometry of the daggerboard on the AC45F  foiling boat used in America’s Cup are presented. Here,  due to FSI effects, the tip deflection of 32cm changes the  coefficient of lift by a factor of 10%. All FSI simulations  are found to be stable and give an indication of material  strengths needed. However, in all analyses we simplify the  structural simulation by treating the structure as a solid  volume with isotropic material properties. Future work  including the use of anisotropic material properties are  highlighted.},
      recid = {11107},
      address = {2019-11-05},
}