Regularity criteria via one directional derivative of the velocity in anisotropic Lebesgue spaces to the 3D Navier-Stokes equations

Abstract: In this paper, we consider the regularity criterion for 3D incompressible Navier-Stokes equations in terms of one directional derivative of the velocity in anisotropic Lebesgue spaces. More precisely, it is proved that u becomes a regular solution if the $\partial_3u$ satisfies $$\int^{T}_{0} \frac{\left|\left|\left|\partial_3 u(t) \right|{L^p{x_1}} \right|{L^q{x_2}} \right|^{\beta}{L^{r}{x_3}}} {1 + \ln\left(|\partial_3u \left(t\right)|_{L^2} + e\right)}dt < \infty,$$ $\text { where } \frac{2}{\beta}+\frac{1}{p}+\frac{1}{q}+\frac{1}{r}=1 \text { and } 2 < p, q, r \leq \infty, 1-\left(\frac{1}{p}+\frac{1}{q}+\frac{1}{r}\right) \geq 0 $.