I want to assess the behavior of oil in the assembly below. In the real system, the piston assembly with its roller follower rotate within the cam ring while the cam itself remains stationary. I'm fine with holding the piston and its roller follower in place and counter-rotating the cam, however. Either way, there is one rotating region encompassing the cam and another encompassing the roller follower which is wholly contained in the cam's rotating region. Is it possible to have rotating regions inside rotating regions? Note I'm a newbie when it comes to flow simulation and am currently in the terribly confused part of the learning curve!
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