Symmetric mesh
 

Hi all,
i got a problem trying to study with fluent a symmetric profile in a symmetric problem in 2D. Indeed the results shows a lift of the order of 10^-2, that should be equal to 0 for a symmetric profile with 0 incidence of flow.
So i controlled mesh (all geometry and mesh has been done with the workbench of ansys 14.5) and i saw that it's asymmetric respect to the axis body. I'm in trouble from days trying to have a symmetric mesh, can you help me?
I'm new of the field, so maybe i'm doing stupid question, but really i dont know what to do to upgrade my results
Thanks to all