Where is the file who the math is made for the simulations of smoke ?

[tiagoblender]

I see a lot of definition for the smoke simulation, but I can’t find the file where the math is made for the simulation, someone knows ?

[doublebishop]

Under here – https://git.blender.org/gitweb/gitweb.cgi/blender.git/tree/HEAD:/intern/smoke/intern