What does using volume fraction of element mean?
'the constraint is set to use 15% of volume fraction of design space'
what does this mean?
It means (volume of optimized structure / volume of original model).
upper boundary of 0.15 means: Take maximum 15% of the original volume for the optimized design.
http://forum.altairhyperworks.com/index.php?/topic/13710-volume-fraction-calculation/
Take a loo at that post. I explained the volume fraction constraint there
