Difference of final temperature between a plane and an axisymmetric geometry
 

Hello,
I am facing a big problem with Fluent v6. Actually, I realize two geometries of a reactor, one plane and one axisymmetric. I have put my axisymmetric geometry in the first quadrant, and y=0 is the axis. I have defined my problem as axisymmetric in the general problem setup of Fluent.
For the plane geometry, I finally find Tmax=2400K.
For the axisymmetric version, Tmax=1300K (with the same boundary condistion, of course...)
Is it something special I missed?

I don't understand what is wrong! I need your help! Thank you very much!