Why is the radiosity solver in ANSYS 8.1 not producing form factors
near 1.0 for my completely closed enclosure?

The radiosity solver is assuming the elements surrounding the enclosure
were numbered counter-clockwise. In your model they were not, and this resulted
in the outward normals pointing in the wrong direction. This error is corrected in
ANSYS 9.0. [Ref: Defect 22601]

Two workarounds are:

1. Renumber elements that are numbered clockwise. I found
ESYM useful for that purpose.
2. Create a radiation matrix for the enclosure instead of using
the radiosity surface flag.

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