求助：二维轴对称网格边界条件如何设定？

lgsh

谁能说说二维轴对称网格中，对称轴的边界条件设定中axis与symmetry有什么区别？

我画的二维网格在fluent运行过程中，大约在残差显示设定时就会出现这样的问题
将对称轴边界条件设置为：axis
fluent显示：Warning: Use of axis boundary condition is not appropriate for
         a 2D/3D flow problem. Please consider changing the zone
         type to symmetry or wall, or the problem to axi-symmetric.
将对称轴边界条件设置为：symmetry
fluent显示：
Warning: It appears that symmetry zone 5 should actually be an axis
         (it has faces with zero area projections).
         Unless you change the zone type from symmetry to axis,
         you may not be able to continue the solution without
         encountering floating point errors.
请高手、论坛元老指点指点，小弟初学，很困惑，感激不尽！

myheater

在解算模型选项里有“2D”“symmetry”“swirl symmetry”，要与你设置的对称边界条件对应