Please check geometry in SpaceClaim.
Select geometry in structure tree --> Use right click --> Select Check Geometry. (Or Tools - Fault Detection in DM)
The geometry should be error free to proceed.
If geometry has any errors, please modify/recreate geometry at those places.
If you have multi body part/component then use Share Topology.
Check Share topology help at https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v221/en/spaceclaim/Discovery/user_manual/st_sharetopology.html?q=share%20topology
Once this is done, make sure you specify correct sizing in the meshing.
Please go through help manual for more details
Please check following videos
Ansys Meshing Sizing:
https://www.youtube.com/watch?v=w4q6q8nKF3U
DM Share topology:
https://www.youtube.com/watch?v=IO4ZtwZdD2I
SpaceClaim Share topology:
https://www.youtube.com/watch?v=h43E1YO1LiM
Ansys Meshing: Meshing Methods:
https://www.youtube.com/watch?v=nEOC8rDnnRo
Regards,
Keyur
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