Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
My recollection is that fictious mass is added to lightweight layers to ensure numerical stability. Note that this approach can handle massless materials (ideal resistances) in addition to real light materials.
However, I could not find the details in the code with a bit of poking around.
If you make and send an example file with some cases that might cause trouble, I can trace through the code and find how the adjustment is made.
