Boss: We should port our internal finite element analysis software to an app. We could use phonegap!

Me: Sure... We'll look into that.
My mind: Nope. No. Never. Dear God. Why. Happy thoughts. Happy thoughts...

what's wrong with phonegap ??

It's a case of right tool for the right job. Finite element analysis is a involved engineering process. Trying to do this in Javascript (while possible) would be a massive pain :/

Then there's configuring the interface for input and canvas rendering of results... Screams nightmare.