In the first image there are 2 solid bodies right?
To connect these 2 solid bodies you will need to use share topology.
Please go through help manual for more details : https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v221/en/spaceclaim/Discovery/user_manual/st_sharetopology.html?q=share%20topology
Please check following videos
DM Share topology:
https://www.youtube.com/watch?v=IO4ZtwZdD2I
SpaceClaim Share topology:
https://www.youtube.com/watch?v=h43E1YO1LiM
Regards,
Keyur
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