[buxtsued]

Hello,
i have to generate a 3D mesh in ANSYS FLUENT 13.0 in order to simulate the sandia D flame for my bachelor thesis (i have got already a tutorial for this flame even with a mesh, but only for the 2D case--->see picture as attachment), but have no idea how i should to proceed for the 3D-case. It should be a 3D space above the axisymmetric burner with a certain diameter, surrounded by a burnt pilot annulus with a certain outer diameter, as well. My supervisor said it should be an uncertain periodic (and/or symmetric) space above the burners....i already have read the userguide, but still don't know how exactly to proceed. Does anybody know how to do this??? Thx in advance