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6DOF - imposing constraints and external forces

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Old   January 5, 2020, 19:19
Question 6DOF - imposing constraints and external forces
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2D simulation, so technically 3DOF.

A rotor is suspended in the middle of a cylinder. I have resorted to the sliding mesh interface method. Doodle:


  • I would like for the rotor to be spun by a torque value.
  • The rotor must be free to translate along the X and Y axes.
  • The rotor must not be able to touch the wall. Translation must be constrained to prevent negative cell volume error.
  • The rotor is pushed towards the centre (0,0) at all times by a preprogrammed, offset-dependent force.

The objective is to study the influence of different rotor shapes on hydrodynamic forces. Hopefully - the hydrodynamic forces will have a stabilising effect, pushing the rotor away from the walls, and strengthening the insignificant centralising forces. Or perhaps the rotor will be sucked towards them w/ a destabilising effect. This is what I would like to find out.

How would I go about setting this up? I have never done 6DOF before, let alone custom equations and 6DOF UDFs. Thanks in advance.
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6dof, dynamic mesh, external forces, fluent, udf

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