Reply To: Meshing problem

[Rob]

I'm aware of what a O-grid/butterfly mesh is, I'm just wondering why anyone would bother doing it now. 

You've set a cell size on the centre body. Have you set any sizing on the surrounding bodies? I'd favour using a single volume, inflate the boundary (read up on Sweep method) and pave the end face. It's far quicker and will likely result in a higher quality mesh.