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arXiv 1409.1649math.AP
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非齐次三维Navier-斯托克斯方程的整体适定性

Global well-posedness of 3-D inhomogeneous Navier-Stokes equations with ill-prepared initial data

Ping Zhang, Zhifei Zhang

摘要:

本文研究了三维不可压非齐次Navier-斯托克斯方程的整体适定性,该方程的初始数据是在一个空间变量上缓慢变化的,即初始数据的形式为$\bigl(1+\e^{\be}a_0(x_{\rm h},\e x_3),(\ve^{1-\al} v^{\rm h}_0, \ve^{-\al}v_0^3)(x_{\rm h},\e x_3)\bigr)$,对于任意的$\al\in ]0,1/3[,$ $\be>2\al,$和$\ve$都足够小.我们注意到,这种类型的初始数据不满足\cite{c-p-z,HPZ3}中的小条件,无论$\e$是多么小。特别是,这个结果大大提高了全局适定性结果在\cite{PZZ3}与所谓的良好准备的初始数据。

英文摘要:

In this paper, we investigate the global well-posedness of 3-D incompressible inhomogeneous Navier-Stokes equations with ill-prepared large initial data which are slowly varying in one space variable, that is, initial data of the form $\bigl(1+\e^{\be}a_0(x_{\rm h},\e x_3),(\ve^{1-\al} v^{\rm h}_0, \ve^{-\al}v_0^3)(x_{\rm h},\e x_3)\bigr)$ for any $\al\in ]0,1/3[,$ $\be>2\al,$ and $\ve$ being sufficiently small. We remark that initial data of this type do not satisfy the smallness conditions in \cite{c-p-z,HPZ3} no matter how small $\e$ is. In particular, this result greatly improves the global well-posedness result in \cite{PZZ3} with the so-called well-prepared initial data.

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