I'm looking for the best package for doing the following: building a 3D model (or loading externally) of a non-standard windmill shape, simulating an airflow over the model, and determining the generated torque. Ideally, it would be either open-source, or have a free demo/low-cost version. Nice-to-have, would be one reasonably simple for a beginner to use. (And Python-based scripting, as long as I'm making a wish...)
As an example, consider this conical wind turbine. How exactly could one determine its power output?
Although I've found various formulas for computing the efficiency of wind turbines, they only apply to the standard three-bladed horizontal-axis turbine. And I don't have the mathematical skills to derive a formula for any non-standard shape. So I'm wondering if a) it could be determined by a simulation, and b) if there's a package that I could manage to do it in.
Packages I've looked at, include numpy/scipy, Blender 3D, Unity 3D (game engine), and FreeCAD. It's possible one of those would manage it, but my cursory evaluation didn't determine that.