added nondimensionalization slides
Revert "added nondimensionalization slides"

This reverts commit 7a4c914cfb750837ce3f28d19f3e031d25f6e0dc.
Revert "Revert "added nondimensionalization slides""

This reverts commit 425993b1d9270b37c8c890211d8dcb2293a8c64d.