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arXiv 2211.03437math.APphysics.flu-dyn
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重力Stokes流的长时间界面动力学

Long time interface dynamics for gravity Stokes flow

Francisco Gancedo, Rafael Granero-Belinchón, Elena Salguero

摘要:

我们研究了由两个不可压缩粘性流体在斯托克斯政权填充二维水平周期性带的界面的动力学。流体受到重力的作用,密度差引起界面的动力学。我们通过$x_1$周期版本的Stokeslet推导出这个问题的轮廓动力学公式。使用这个新的系统,我们表现出当地的时间适定性时,初始界面是由曲线描述没有自相交和$C^{1+γ}$ Hölder正则性,$0<γ<1$。这个适定性的结果保持不管瑞利-泰勒稳定性的物理系统。此外,在瑞利-泰勒稳定区域,小的初始数据的整体存在性和衰减到平坦的定态被证明。最后,在Rayleigh-Taylor不稳定制度,我们构造了一个广泛的家庭的光滑的解决方案与指数的时间增长的存在的任意大的间隔。值得注意的是,导致这种指数增长性的初始数据可能缺乏任何对称性。

英文摘要:

We study the dynamics of the interface given by two incompressible viscous fluids in the Stokes regime filling a 2D horizontally periodic strip. The fluids are subject to the gravity force and the density difference induces the dynamics of the interface. We derive the contour dynamics formulation for this problem through a $x_1$-periodic version of the Stokeslet. Using this new system, we show local-in-time well-posedness when the initial interface is described by a curve with no self-intersections and $C^{1+γ}$ Hölder regularity, $0<γ<1$. This well-posedness result holds regardless of the Rayleigh-Taylor stability of the physical system. In addition, global-in-time existence and decay to the flat stationary state is proved in the Rayleigh-Taylor stable regime for small initial data. Finally, in the Rayleigh-Taylor unstable regime, we construct a wide family of smooth solutions with exponential in time growth for an arbitrary large interval of existence. Remarkably, the initial data leading to this exponential growth possibly lack any symmetry.

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