For complex motion (that is, where the direction of the rotation axis is changing), the description of the motion is not trivial. It is possible to have Ansys Polyflow help you set up the complex motion of a moving part. To do this, set up the data file in Ansys Polydata as usual, but do not complete the definition of the motion. Then, run Ansys Polyflow on your data file (for example, myfile.dat) using the -motion option:

polyflow -motion < myfile.dat 

When you use the -motion option, Ansys Polyflow does not solve the flow problem or postprocessors; it just computes the positions of the moving parts and produces a listing file and one or more pairs of flum and flur files.

In the listing file, at the beginning of each step, you can check the values of the angles , , and , the associated angular velocities, the translation vector, and the translational velocity. You can read the flum and flur files into Fluent/Post and view the position graphically.

You can also define the motion in a series of steps, rather than defining all components of the motion at once. After each step, save a data file and run Ansys Polyflow on it using the -motion option, as described above. You can then check the position after each step by reading the associated flum and flur files into Fluent/Post.