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eccentric rotation

eccentric rotation

eccentric rotation

(OP)
Hi,
can somebody share suggestions about the following:

Problem: how to analyze the rotation of a deformable body around an axis not passing through the centroid, when it accelerates from 0 rpm to regime speed and then stays at the regime for a while (eccentric rotation with centrifugal and unbalancing effects).

Why am I asking this: the rotating body has a complicate section shape, so I can't use PIPE16 or other similar methods; on the other hand, a full 3D model I am running right now seems too heavy for a transient analysis (it takes 20 mn per substep); it seems I can't take advantage of axisymmetry because the eccentric axis is ruining BC symmetry. I am wondering which is the most resource-saver method for this analysis. Maybe harmonic elements with MODE=1, ISYM=-1 ??? And which is the correct way to use CMOMEGA ?

Thanks in advance,

Regards

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