meshing a conical frustum
 

I have a conical frustum shaped 3D volume to be meshed. Now, there are natural convection currents in this volume and from reyleigh number i know that the conditions are turbulent in this region. I need some help in meshing this region correctly. just using cooper tool is not a good idea. I need a fine mesh closer to the boundary (slant faces) to better resolve the flow. Please give me some suggestions. Or direct me to the correct point in the fluent online help. I do have a login for fluentusers.com

thanks, CO2