Regularity criterion for 3D Navier-Stokes Equations in Besov spaces

摘要

Several regularity criterions of Leray-Hopf weak solutions $u$ to the 3DNavier-Stokes equations are obtained. The results show that a weak solution $u$becomes regular if the gradient of velocity component $\nabla_{h}{u}$ (or $\nabla{u_3}$) satisfies the additional conditions in the class of $L^{q}(0,T;\dot{B}_{p,r}^{s}(\mathbb{R}^{3}))$, where$\nabla_{h}=(\partial_{x_{1}},\partial_{x_{2}})$ is the horizontal gradientoperator. Besides, we also consider the anisotropic regularity criterion forthe weak solution of Navier-Stokes equations in $\mathbb{R}^3$. Finally, wealso get a further regularity criterion, when give the sufficient condition on$\partial_3u_3$.