The geometric approaches to the possible singularities in the inviscid fluid flows

We consider the possible generation of singularities of a vector field transported by diffeomorphisms with derivatives of uniformly bounded determinants. We find relations between the directions of the vector field and the eigenvectors of the derivative of the back-to-label map near the singularity. We also find an invariant when we follow the motion of the integral curves of the vector field. For the 3D incompressible Euler equations these results have immediate implications about the directions of the vortex stretching and the material stretching near the possible singularities. We also have similar applications to other inviscid fluid equations such as the 2D quasi-geostrophic equation and the 3D magnetohydrodynamics equations.

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