Why will ANSYS not mesh this cyclic volume? I am not receiving any errors, and other volumes of the same model can be meshed.

This is defect 74384 and has been fixed in 12.0. To address the problem of no error message being displayed, the following was created for this case:

*** ERROR *** CP = 0.000 TIME= 00:00:00
Cyclic symmetry information is missing (parameter CYCLIC_XREF_A is not
defined). The VMESH operation cannot be completed. Entering
CYCLIC,OFF and then CYCLIC may enable successful meshing.

The suggested workaround may allow your volume to mesh.

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