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arXiv 1202.4969math.AP
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无穷远处小环量二维外流的长时间渐近性

Long-time asymptotics for two-dimensional exterior flows with small circulation at infinity

Thierry Gallay, Yasunori Maekawa

摘要:

本文考虑二维外区域中不可压Navier-斯托克斯方程,无滑移边界条件。我们假设初速度是具有环量α的Oseen涡的有限能量和L^q可和扰动,其中1 < q < 2。当α足够小时,我们证明了该解在时间上的渐近行为类似于具有环流α的自相似Oseen涡。这是一个全局稳定性的结果,它适用于任意大扰动的Oseen涡,我们的环流小假设是独立的域考虑。

英文摘要:

We consider the incompressible Navier-Stokes equations in a two-dimensional exterior domain, with no-slip boundary conditions. We assume that the initial velocity is a finite-energy and L^q-summable perturbation of the Oseen vortex with circulation α, where 1 < q < 2. If α is sufficiently small, we show that the solution behaves asymptotically in time like the self-similar Oseen vortex with circulation α. This is a global stability result, which holds for arbitrarily large perturbations of the Oseen vortex, and our smallness assumption on the circulation is independent of the domain under consideration.

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