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arXiv 2102.02748math.AP
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弱Kolmogorov假设下非齐次不可压Navier-Stokes方程在$\mathbb{R}^3$中的无粘极限

Inviscid limit of the inhomogeneous incompressible Navier-Stokes equations under the weak Kolmogorov hypothesis in $\mathbb{R}^3$

Dixi Wang, Cheng Yu, Xinhua Zhao

摘要:

本文考虑了$\mathbb{R}^3$中弱Kolmogorov假设下非齐次不可压Navier-斯托克斯方程的无粘极限。特别地,我们首先推导出在$\mathbb{R}^3$中的Kolmogorov型假设,该假设给出了对于某些$α>0$,$\sqrt{ρ^μ}{\bf u}^μ$在$L^2_x$中的$α^{th}$阶分数导数的一致界,与粘度无关。在$L^2$空间中,一致界可以提供$\sqrt{ρ^μ}\bf u^μ$的强收敛性.这表明无粘极限是相应欧拉方程的弱解。

英文摘要:

In this paper, we consider the inviscid limit of inhomogeneous incompressible Navier-Stokes equations under the weak Kolmogorov hypothesis in $\mathbb{R}^3$. In particular, we first deduce the Kolmogorov-type hypothesis in $\mathbb{R}^3$, which yields the uniform bounds of $α^{th}$-order fractional derivatives of $\sqrt{ρ^μ}{\bf u}^μ$ in $L^2_x$ for some $α>0$, independent of the viscosity. The uniform bounds can provide strong convergence of $\sqrt{ρ^μ}\bf u^μ$ in $L^2$ space. This shows that the inviscid limit is a weak solution to the corresponding Euler equations.

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