temperature limited in some cells
 

I am getting temperature limited to 1 in some 100 cellls and temperature limited to 5000 in some ... cells. Can anybody see my mesh file and help me how to improve the mesh quality ( other than what we do using improve-improve quality in fluent) can we localised improve the mesh in Fluent.
Plz see the link of my case file
https://www.dropbox.com/sh/8saox6nt7nke788/Q2eS9GHwa7