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arXiv 2008.12347math.AP
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二维Navier-Stokes流定常Prandtl展开式的整体$x$稳定性

Global-in-$x$ Stability of Steady Prandtl Expansions for 2D Navier-Stokes Flows

Sameer Iyer, Nader Masmoudi

摘要:

在这项工作中,我们建立了收敛的二维,稳态Navier-Stokes流,$(u^ε, v^ε)$的经典普朗特边界层,$(\bar{u}_p, \bar{v}_p)$,提出的域$(0, \infty) \times (0, \infty)$:\begin{equation*} \| u^ε - \bar{u}_p \|_{L^\infty_y} \lesssim \sqrtε \langle x \rangle^{- \frac 1 4 + δ}, \qquad \| v^ε - \sqrtε \bar{v}_p \|_{L^\infty_y} \lesssim \sqrtε \langle x \rangle^{- \frac 1 2}. \end{equation*}这验证了普朗特的边界层理论\textit{globally}在$x$ -变量的一大类边界层,包括整个一个参数家庭的经典Blasius配置文件,具有尖锐的衰减率。结果同时证明了两种意义下的渐近稳定性:(1)作为$ε\rightarrow 0$的渐近稳定性和(2)作为$x \rightarrow \infty$的渐近稳定性.特别是,我们的结果提供了第一个严格的确认的Navier-Stokes方程,边界层不能“分离”在这些稳定的制度,这是非常重要的物理和工程应用。

英文摘要:

In this work, we establish the convergence of 2D, stationary Navier-Stokes flows, $(u^ε, v^ε)$ to the classical Prandtl boundary layer, $(\bar{u}_p, \bar{v}_p)$, posed on the domain $(0, \infty) \times (0, \infty)$: \begin{equation*} \| u^ε - \bar{u}_p \|_{L^\infty_y} \lesssim \sqrtε \langle x \rangle^{- \frac 1 4 + δ}, \qquad \| v^ε - \sqrtε \bar{v}_p \|_{L^\infty_y} \lesssim \sqrtε \langle x \rangle^{- \frac 1 2}. \end{equation*} This validates Prandtl's boundary layer theory \textit{globally} in the $x$-variable for a large class of boundary layers, including the entire one parameter family of the classical Blasius profiles, with sharp decay rates. The result demonstrates asymptotic stability in two senses simultaneously: (1) asymptotic as $ε\rightarrow 0$ and (2) asymptotic as $x \rightarrow \infty$. In particular, our result provides the first rigorous confirmation for the Navier-Stokes equations that the boundary layer cannot "separate" in these stable regimes, which is very important for physical and engineering applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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