The append function simply drops the section of mesh into the domain at the position it was created for. Chances are it's overlapping because you didn't leave a gap between the inlet & outlet domain, or more likely didn't split the rotor section out of the inlet domain if that's the one it's colliding with.Â
Assuming you read in inlet, outlet and rotor in that order. Open inlet & transform by whatever distance is needed (ie how long the rotor is). Append the outlet. Hopefully there's a gap to fill when you import the rotor.Â
However, if you create a conformal geometry you could just mesh it all in one go. The interior faces between zones would be interior and could be slit if required to allow the rotor to actually move.Â
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