Hello Milne,
since your pendulum undergoes 1DOF rotation about the X-axis, you will need to enter the Ixx moment of inertia passing through the center of mass. Specifying the center of rotation and axis in the 6-DOF Properties dialog box, and the center of gravity location in the Dynamic Mesh Zones dialog box, Fluent will compute the correct moment of inertia during calculation.
I hope this helps.
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