| Volume 4, Number 4, 2014, Pages 355-365 DOI：10.11948/2014019 |
| Remarks on the regularity criteria of the solutions of the 3D micropolar fluid equations |
| Liu Qiao |
| Keywords:micropolar fluid equations |
| Abstract: |
| We provide two regularity criteria for the weak solutions of the 3D micropolar fluid equations, the first one in terms of one directional derivative of the velocity, i.e., ∂3u, while the second one is is in terms of the behavior of the direction of the velocity u|u|. More precisely, we prove that if \begin{equation*} \partial_{3}u \in L^{\beta}(0,T;L^{\alpha}(\mathbb{R}^{3}))\quad\text{ with }\frac{2}{\beta}+\frac{3}{\alpha}\leq 1+\frac{1}{\alpha}, 2< \alpha \leq\infty, 2\leq\beta< \infty; \end{equation*} or \begin{equation*} \operatorname{div}\left(\frac{u}{|u|}\right)\in L^{\frac{4}{1-2r}}(0,T;\dot{X}_{r}(\mathbb{R}^{3}))\quad \text{ with } 0\leq r< \frac{1}{2}, \end{equation*} then the weak solution (u(x,t),ω(x,t)) is regular on R3×[0,T]. Here ˙Xr(R3) is the multiplier space. |
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