Dear Aniket:
Thanks for your reply. However, this issue happened when I re-installed the Ansys 2023 R1. Even I drawn a retangle and used the rotation function to draw a Cylinder, the cylinder volume did not generate after pressing the generation button.

My cylinder is using a retangle and rotated at Y-axis, it was selected as "Add frozen" function. However, the cylinder volume cannot display, only the dot lines will be showen when my curser is getting closer to it.
Actually, when I re-installed this Ansys 2023 R1, there is an error that the VC_redist.x64.exe cannot be installed, I downloaded the VC_redist.x64.exe so that the program can be started normally. However, this fault happened. Even I cannot find my model in the mesh window.
May I know this is the software crashed or setting problems. Thanks!
Winston