First you need to make sure the SketchUp model has all the geometry defined - currently you are missing the doors.

Also you need to ensure that all the edges in the SketchUp model are shared by 2 faces.

I noticed that some larger edges are not split with smaller coincident edges. To fix use the SketchUp line tool to redraw the smaller edge and then if the two shared faces are planar, use the SketchUp eraser tool to remove the edge to form a single face.

Sometimes during import into Caedium a face will merge with a neighbor and not honor a edge that separated the two faces in SketchUp. In this case you need to make a copy of one of the two faces and export it in a separate COLLADA file. Delete the face in the original SketchUp model and export the remaining model. In Caedium import both COLLADA files and then use the Edges->Connect tool on the Geometry Tool Palette to connect the coincident edges.

All things being well you can go ahead in Caedium and use the Volume->Stitch tool with the Topology Only property switched on to form your flow volume.

The Panel Flow method assumes irrotational flow, so it can not simulate recirculation regions. In light of your requirement for aesthetics I'd suggest using the RANS Flow method.

To export a movie (.avi) you'll need to animate something. You have a number of options:

• Run an unsteady simulation where flow evolves over time. For more details see "Incompressible Transient Flow with Heat Transfer"
• Animate particles. For more details see "Particles or Streamlines"
• Animate a cutting plane. For more details see "Caedium Only"
• Animate a camera. For more details see "Camera Rotation Movie"

Or some combination of the above.