我在分析风力发电机流场时,把旋转流场的外表面和外流场的内表面设置成两个interface。但是在meshing模块画网格时只有一个interface会产生网格,另外一个不会产生网格。提示如下:One or more Named Selections have no mesh associated with them. Either the Assembly meshing failed due to tessellation problems or the size of a Named Selection is smaller than the min. size.这是什么原因?怎么解决?谢谢!