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Regularity Criterion For 3d Navier-stokes Equations In Terms Of The Direction Of The Velocity

机译:关于速度方向的3d Navier-stokes方程的正则性判据

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In this short note we give a link between the regularity of the solution u to the 3D Navier-Stokes equation and the behavior of the direction of the velocity u/|u|. It is shown that the control of div(u/|u|) in a suitable L_t~p(L_x~q) norm is enough to ensure global regularity. The result is reminiscent of the criterion in terms of the direction of the vorticity, introduced first by Constantin and Fefferman. However, in this case the condition is not on the vorticity but on the velocity itself. The proof, based on very standard methods, relies on a straightforward relation between the divergence of the direction of the velocity and the growth of energy along streamlines.
机译:在此简短说明中,我们给出了3D Navier-Stokes方程的解u的规律性与速度u / | u |的方向行为之间的联系。结果表明,以合适的L_t〜p(L_x〜q)范数控制div(u / | u |)足以确保全局规则性。结果令人回想起康斯坦丁和费弗曼首先提出的关于涡度方向的判据。但是,在这种情况下,条件不是涡旋而是速度本身。基于非常标准的方法的证明依赖于速度方向的发散与沿流线的能量增长之间的直接关系。

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