Thread: Navier stokes View Single Post
 The inclusion of pressure in the equation causes additional mathematical difficulties because pressure is non-local. Also, the derivation of the time dependent NS through variation assumes that time is stationary and in effect it is questionable whether it is present as a dynamical variable or a parameter. Moreover, since it describes fields it should display some form of gauge invariance which is still under investigation and its relationship with any form of Noether's theorem is at best weak.