[zlaugh]

I'm doing natural convection to study heat transfer coefficient. therefore has 2 body, one solid geometry and one fluid control volume.

i created the solid geometry in 1 body first then create the control volume with 'add frozen' and specify it to fluid.

picture below is pre mesh.





then i just click update and mesh it without changing anything. post mesh picture as shown below




is this the correct way of meshing? or should i change some of the setting?

in workbench, geometry and mesh has tick beside it so i assume it is ok. but when i open setup, it shows 'model information is incompatible with incoming mesh' like picture below





and this is how it looks after i click ok.




can someone pls tell me what's wrong?
and how do i set boundary condition? treat every surface as wall?
all surface has set temperature as 303K and the solid geometry as higher temperature?