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arXiv 2007.13450math.AP
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大初值下可压缩Navier-斯托克斯方程强解的衰减性

Decay of Strong Solution for the Compressible Navier-Stokes Equations with Large Initial Data

Jincheng Gao, Zhengzhen Wei, Zheng-an Yao

摘要:

本文研究了三维全空间中可压缩Navier-斯托克斯方程具有显式衰减率的整体大解到其相关常平衡态的收敛性.假设初始数据属于某个负索伯列夫空间而不是Lebesgue空间,我们不仅证明了解的负Sobolev范数在时间演化过程中保持不变,而且得到了整体大解收敛到其相关常数平衡态的代数衰减率.此外,我们还证明了完全可压缩Navier-斯托克斯方程大解的一阶空间导数在$L^2-$范数下收敛到零的衰减率为$(1+t)^{-5/4}$,这与热传导方程一致.这扩展了先前在\cite{he-huang-wang2}中获得的衰减速率$(1+t)^{-3/4}$。

英文摘要:

In this paper, we investigate the convergence of the global large solution to its associated constant equilibrium state with an explicit decay rate for the compressible Navier-Stokes equations in three-dimensional whole space. Suppose the initial data belongs to some negative Sobolev space instead of Lebesgue space, we not only prove the negative Sobolev norms of the solution being preserved along time evolution, but also obtain the convergence of the global large solution to its associated constant equilibrium state with algebra decay rate. Besides, we shall show that the decay rate of the first order spatial derivative of large solution of the full compressible Navier-Stokes equations converging to zero in $L^2-$norm is $(1+t)^{-5/4}$, which coincides with the heat equation. This extends the previous decay rate $(1+t)^{-3/4}$ obtained in \cite{he-huang-wang2}.

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