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Coordinate system and boundary conditions for a semisubmersible column

Coordinate system and boundary conditions for a semisubmersible column

Coordinate system and boundary conditions for a semisubmersible column

(OP)
I am new to Abaqus. I am doing a local linear analysis of a semisubmersible column. I am modelling just the mid part of a column quadrant.
I shall keep it from moving in tangential and radial direction (at different occasions), but my present coordinate system is 3D cartesian. Do I have to convert it to Polar coordinate system, and if so, how do I do that?
Also, I have some problems defining the boundary conditions. Anyone having experience with defining BC for a semi submersible column? Tips are higly appreciated.
Thanks!

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