Asymptotic behavior of the steady Navier-Stokes flow in the exterior domain

Asymptotic behavior of the steady Navier-Stokes flow in the exterior domain
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外域稳定纳维-斯托克斯流的渐近行为

DOI:
10.1016/j.jde.2020.05.042
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发表时间:
2020-01
影响因子:
2.4
通讯作者:
Zhao Lingling
Zhao Lingling
中科院分区:
数学2区
文献类型:
--
作者:
Men Yueyang;Wang Wendong;Zhao Lingling

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考虑一类外区域上具有无界漂移的椭圆型方程,得到了它在无穷远处的唯一性的定量估计,即−u+W⋅∇u=0的非平凡解在无穷远处以⁡(−⁡C|x|‖2‖∞(R2∖B1)≲1的形式衰减,并借助于一些反例证明了这个估计是尖锐的.这些结果也推广了Kenig-Wang[13]或Kenig-Silvestre-Wang[14]的衰变定理。作为应用,还考虑了不可压缩流体绕有界障碍物的渐近行为。特别是对于二维情况,我们可以将文[16]中的衰减率改进为指数⁡(−C|x|log2⁡|x|),其中指数⁡(−C|x|32+)的最小衰减率是由Kow-Lin在最近的一篇论文[16]中利用适当的Carleman估计得到的。
We consider an elliptic equation with unbounded drift in an exterior domain, and obtain quantitative uniqueness estimates at infinity, ie the non-trivial solution of−△ u+ W⋅∇ u= 0 decays in the form of exp⁡(− C| x| log 2⁡| x|) at infinity provided‖ W‖ L∞(R 2∖ B 1)≲ 1, which is sharp with the help of some counterexamples. These results also generalize the decay theorem by Kenig-Wang [13] or Kenig-Silvestre-Wang [14] in the whole space. As an application, the asymptotic behavior of an incompressible fluid around a bounded obstacle is also considered. Specially for the two-dimensional case, we can improve the decay rate in [16] to exp⁡(− C| x| log 2⁡| x|), where the minimal decaying rate of exp⁡(− C| x| 3 2+) is obtained by Kow-Lin in a recent paper [16] by using appropriate Carleman estimates.
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