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Geometric constraints on potentially singular solutions for the $$3-D$$ Euler equations. (English) Zbl 0853.35091
We discuss necessary and sufficient conditions for the formation of finite time singularities (blow up) in the incompressible three-dimensional Euler equations. The well-known result of J. T. Beale, T. Kato and A. Majda [Commun. Math. Phys. 94, 61-66 (1984; Zbl 0573.76029)] states that these equations have smooth solutions on the time interval $$[0, T)$$ if, and only if $\lim_{t\to T} \int^t_0 |\omega(\cdot, s)|_{L^\infty(dx)} ds< \infty,$ where $$\omega= \nabla \times u$$ is the vorticity of the fluid and $$u$$ is its divergence-free velocity. In this paper, we prove criteria in which the direction of vorticity $$\xi= \omega/|\omega|$$ plays an important role.

##### MSC:
 35Q35 PDEs in connection with fluid mechanics 35B40 Asymptotic behavior of solutions to PDEs 76B47 Vortex flows for incompressible inviscid fluids
Zbl 0573.76029
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##### References:
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