How to define the two axles rotating vessel
 

I am doing simulation for two axles rotating vessel with FLUENT. The vessl rotates arrond x-axles and in the mean time rotates itself, which same like the earth rotates arround the sun and it also rotate itself. the axle for it self-totation is rotated arround x-axle within Y-Z plan. Could you please to help me how to difine this motion? I belive I shilud use dynamic meshing and UDF, but I don't know how to write UDF about this .:confused: