# Math Physics Seminar | Chris Fronsdal, UCLA | "A classic Mistake and what it tells us" | Jadwin 343

Tue, Apr 17, 2018, 4:30 pm
Location:
Rayleigh's stability analysis of cylindrical Couette flow, of 1916, is in contradiction with observation, but it is still widely quoted and no one seems to know what   the reason is that it fails. I shall identify the mistake as one that is endemic in the literature.  Briefly, the argument depends on the Navier-Stokes equation and the mistake is the assumption that a certain expression  called  energy density" or kinetic potential" can be interpreted and used  as  such. No energy density compatible with the Navier-Stokes equation exists.