For best results, the rotor region should be donut-shaped, i.e., there should be a hole running through its centre. Only for such shapes the unwrapping into a box is well defined. If there is no hole in the middle, this option allows specifying a positive radius of a hole to drill before unwrapping.
The selected tutorials and boundary conditions are artificially designed for purposes of this manual. Because of the examples designs (may not real machines), the results of this tutorials may be unphysical. The computational meshes are quite coarse to enable availability of using it during trainings of this product on laptops or personal computers.
ParaView uses a permissive BSD license that enables the broadest possible audience, including commercial organizations, to use the software, royalty free, for most purposes. In addition, there are other licenses that are applicable because of other packages leveraged by ParaView or developed by collaborators. Lastly, there are specific packages for the ParaView binaries available on paraview.org that have applicable licenses.
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