Dh. Chae et N. Kim, ON THE BREAKDOWN OF AXISYMMETRICAL SMOOTH SOLUTIONS FOR THE 3-D EULEREQUATIONS, Communications in Mathematical Physics, 178(2), 1996, pp. 391-398
We refine the Beale-Kato-Majda criterion for the breakdown of smooth s
olutions of the 3-D incompressible Euler equations in the case of axis
ymmetry. In this case the angular component of vorticity in the cylind
rical coordinates alone controls blow-up of the higher Sobolev norms o
f the velocity.