Jari has put quite a bit of time and effort into learning to use the OpenFOAM open-source CFD package. It's maybe not as polished and pretty as Comsol or Ansys or any of the other 10+ keur costing commercial packages, but it seems OpenFOAM has all the same solvers and physics models and is able to handle complex geometries and meshing - if you spend the time and effort to learn how it all works.
Stay tuned for some "digital wind-tunnel" testing of IOM sails and foils... (bring your 4/8-core machine and 8+ Gb of RAM)