Symplectic Symmetry and Radial Symmetry Either Persistence or Breaking of Incompressible Fluid

Abstract

The incompressible Navier-Stokes equations are considered. We find that these equations have symplectic symmetry structures. Two linearly independent symplectic symmetries form moving frame. The velocity vector possesses symplectic representation in a moving frame. The symplectic representation of two-dimensional Navier-Stokes equations holds radial symmetry persistence. On the other hand, we establish some results of radial symmetry either persistence or breaking for the symplectic representations of three-dimensional Navier-Stokes equations. Thanks radial symmetry persistence, we construct infinite non-trivial solutions of static Euler equations with given boundary condition.