I agree with you, that's why I wrote ..." There are other ways to deal with nozzles too. See the User Guide".

Your suggestion for modelling simplifies multiple thermal load case work too.

One word of warning ... if it's a tall tower or similar, be sure that your 'rigid' element is actually rigid enough, by using a large diameter, heavy wall and zero weight. If a small diameter were used, because Caesar simulates a rigid element by increasing the wall thickness, you may end up with significant and unreal flexibility.