Hi guys.
Recently I am working on a lightweight pavilion, which is with borderless boundary. So technically it is a pavilion locating in the outdoor space.
And I was trying to see the air flow around the pavilion, but unfortunately the mesh around it could not generate any snap hex meshes on the surface. As it has no spaces to separate indoor and outdoor, could it be the reason why I cant generate the mesh?
Also for the red color in the mesh(representing wind velocity in my case), even I changed the upbound of the legend to an extreme impossible value (like 1000 m/s), it still exists. So I am not sure if this is the problem of mesh.
As you can see from the picture, the meshes were working great around the buildings. And there’s one more step before. I tried flattening the brep input of the pavilion, otherwise I would get so many overlapping meshes which I think it could not be correct. But when flattening it, the mesh can not be generate anymore.
Is there any suggestion for the mesh on surface?
Thank you in advance. 
Beiyu