Do some geometry cleanup & consider only half portion for mesh because of symmetry.Try with solid mesh & convert geometry in to mappable volume.(one volume or multisolid)

thanks  @Rahul R but symmetry  ok fine , small circle connected what i do connectivity from small circle to major one 

I see you have too many feature lines in your model.First try to have simplified geometry(free from geometrical error).Also please refer below geometry editing tutorial.

Have a look at my mesh.

<?xml version="1.0" encoding="UTF-8"?>

Unable to find an attachment - read this blog

super work thanks a lot @Q.Nguyen-Dai   can you do connectivity   large circle