How do you set up a nested rotation in CFX-10.0?
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In general, specifying a rotating domain inside a rotating domain in CFX-Pre does not move the axis of the rotated domain. This needs to be done as a moving mesh case. Let's say that a larger outer cylinder is spinning around a global z axis and smaller inner cylinders are rotating around their own local z axis (as well as around a global z axis). Then the solid body rotation of the large cylinder needs to be defined as a moving mesh and the local rotation of smaller cylinders as a number of individual rotating domains. The larger cylinder needs to be connected to the surrounding stationary domain by a standard GGI interface which will automatically update the reintersecting moving mesh. The smaller (inner) rotating cylinders must be connected to the larger (outer) cylinder by transient rotor-stator interfaces. Defining an interface, creates two separate BCs patches, one for each domain. These patches need to move with the same mesh displacement as the volume mesh of the larger (outer) cylinder, therefore mesh motion has to be defined for them as well. |
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