你理解错了吧,应该是它们差别不小时网格有问题:If the difference between the minimum, maximum, and average values is not negligible, then there is a problem with the mesh: the mesh geometry is not periodic about the specified axis.
如果你用fluent6.3或更早版本,毗邻单元区轴线就在boundary condition里定义;如果用fluent12或post 12,在cell condition里。