SimScale CAE Forum

Modelling Centrifugal Fan doesn't seem to rotate

  • A description of the project and what you are trying to achieve
    Model a centrifugal fan and the airflow through a fan shroud to analyze airflow around a 3D Printer nozzle.

  • An description of what is happening, screenshots or error logs are helpful
    I’m looking into modelling a centrifugal fan with my fan duct however it seems like my rotating zones isn’t actually rotating and the air flow is just following the fan blades. One thing I can think of is my rotating zone is donut instead of a cylinder. Also should I assign the rotating zone a material (air)? I don’t think it’s rotating because I expect the outer edges of the fan to have a higher velocity but it seems like the opposite is true.

  • [Important] Always provide a link to your project so that it is easy to find.
    Simulation: ShroudRevB-V5


Hi @4nthonylin: After a quick look I see no obvious defect in your simulation. You have air inlet at 4 m/s, MRF rotation (fan) is -200 rad/s, so those speeds match.

You can, as a test, set rotations to 0 rad/s and spot differences in forces and moments…

Next test would be to set inlet BC to ‘Zero gradient’(Custom) and keep the rotation of MRF.

Take care,