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arXiv 0907.4357math.APmath.FA
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高维Navier-斯托克斯方程的可解性判据

A Solvability criterion for Navier-Stokes equations in high dimensions

T. M. Viswanathan, G. M. Viswanathan

摘要:

对于所有的$n\geq 2$,我们定义了耗散$-(-Δ)^α$在${\Bbb R}^n$中的Navier-斯托克斯方程的Ladyzhenskaya-Lions指数$α_{\rm {\tiny \sc l}} (n)=({2+n})/4$.我们回顾了当$α\geq α_{\rm {\tiny \sc l}} (n)$,给定光滑初始数据时强全局可解性的证明。如果$n>2$的相应欧拉方程允许涡度拟能${1\over 2} \|\nabla u \|^2_{L^2}$的不受控制的增长,那么目前已知不存在全局控制的强制量,其可以正则化$α<α_{\rm {\tiny \sc l}} (n)$的Navier-斯托克斯方程的解。能量仅对$α=α_{\rm {\tiny \sc l}} (n)$在尺度变换下是关键的。

英文摘要:

We define the Ladyzhenskaya-Lions exponent $α_{\rm {\tiny \sc l}} (n)=({2+n})/4$ for Navier-Stokes equations with dissipation $-(-Δ)^α$ in ${\Bbb R}^n$, for all $n\geq 2$. We review the proof of strong global solvability when $α\geq α_{\rm {\tiny \sc l}} (n)$, given smooth initial data. If the corresponding Euler equations for $n>2$ were to allow uncontrolled growth of the enstrophy ${1\over 2} \|\nabla u \|^2_{L^2}$, then no globally controlled coercive quantity is currently known to exist that can regularize solutions of the Navier-Stokes equations for $α<α_{\rm {\tiny \sc l}} (n)$. The energy is critical under scale transformations only for $α=α_{\rm {\tiny \sc l}} (n)$.

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