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arXiv 2602.17059math.AP
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对称流体在粘性流入边界条件下的渐近稳定性

Asymptotic stability of symmetric flows with viscous inflow boundary condition

Brown University(布朗大学);The Ohio State University(俄亥俄州立大学)

Yan Guo, Zhuolun Yang

AI总结:

本文研究了对称流在粘性流入边界条件下的渐近稳定性,通过新的加权涡量能量方法证明了线性稳定性与指数衰减,并在不同通道长度范围内获得了非线性稳定性结果。

摘要:

我们研究了在矩形通道Ω=(0,L)×(0,H)中,具有小粘度ε<<1的二维不可压缩纳维-斯托克斯方程,其中在水平壁上采用ε-纳维-斯托克斯滑动条件,扰动流函数采用粘性流入条件。对于广泛的一类对称基流 профиль u_0(y) 在壁上消失,我们构造了一个精确的稳态解(u_s,v_s),该解与剪切流(u_0,0)相差O(ε^{1/3})。然后我们开发了一种新的加权涡量能量方法,以证明线性稳定性与指数衰减:扰动在O(ε^{-1/3})的时间尺度上以加权L^2范数指数衰减。在短通道 regime L<<1 中,该方法给出了非线性渐近稳定性,阈值为O(ε^{2/3})。在长通道 regime 中,假设凹性并结合谱条件,我们引入了控制非有利项的量“雷利涡量”,从而获得非线性稳定性,阈值为O(ε^{5/6+})。

英文摘要:

We study the two-dimensional incompressible Navier-Stokes equations in a channel $Ω=(0,L)\times(0,H)$ with small viscosity $\varepsilon\ll1$, an $\varepsilon$-Navier slip condition on the horizontal walls, and a viscous inflow condition for the perturbation stream function. For a broad class of symmetric base profiles $u_0(y)$ vanishing on the walls, we construct an exact steady solution $(u_s,v_s)$ that is $O(\varepsilon^{1/3})$-close to the shear $(u_0,0)$. We then develop a new weighted vorticity energy method to prove uniform linear stability and exponential decay: perturbations decay exponentially in a weighted $L^2$ norm on the time scale $O(\varepsilon^{-1/3})$. In the short-channel regime $L\ll1$, the method yields nonlinear asymptotic stability with threshold $O(\varepsilon^{2/3})$. In the long-channel regime, assuming concavity together with a spectral condition, we introduce a quantity \textit{Rayleigh vorticity} to control the non-favorable terms and obtain nonlinear stability with threshold $O(\varepsilon^{5/6+})$.

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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