共轭传热问题求教

1、使用fluent软件进行共轭传热的模拟，网格划分见附件。
2、其中固体部分为双层套管，材质分别为碳钢和铝；
3、使用wb mesh完成网格划分后，导入fluent后，在进行网格检查时，出现错误提示，请问我应该如何处理。如下：
3.1、提示一：
Warning: zone of type interior found between different solids!
  Material of cell zone 5 is aluminum, while material of cell zone 6 is steel.
      This will adversely affect the solution.
      It is recommended that you fix this issue via the TUI command
      /mesh/modify-zones/slit-interior-between-diff-solids
3.2、提示二：
Setting Post Processing and Surfaces information ...Note: zone-surface: cannot create surface from sliding interface zone.
Creating empty surface.
Note: zone-surface: cannot create surface from sliding interface zone.
Creating empty surface.
Note: zone-surface: cannot create surface from sliding interface zone.
Creating empty surface.
Note: zone-surface: cannot create surface from sliding interface zone.
Creating empty surface.
         Done.