First of all, thank you very much for your answers.

In my analysis, I specified the global cylindrical coordinate system as my solution coordinate system and nodal coordinate system from the beginning. In post-processing, I also used this coordinate system. Even so, are the results I extracted still not the real global cylindrical coordinate system?

I am very interested in your idea that the cylindrical coordinate system specified by RSYS is actually the local cylindrical coordinate system of each node. Can you provide the source of this statement? I didn't find this statement in the help documentation.

You finally shared how to obtain data in the real cylindrical coordinate system. You think I should extract data in the Cartesian coordinate system through RSYS,1 and finally convert it through formulas. I will give it a try.

If you can tell me more about the inherent problems of the cylindrical coordinate system in ANSYS and how to extract data, it would be of great help to me.