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arXiv 1806.04056math.AP
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具有分数阶边界算子的线性化自由面Navier-斯托克斯方程解的衰减性

Decay of solutions to the linearized free surface Navier-Stokes equations with fractional boundary operators

Ian Tice, Samuel Zbarsky

摘要:

本文考虑一个上有自由边界、下有平面刚性界面并受重力作用的粘性不可压缩流体板。唯一的平衡是静止流体的平板。众所周知,平衡态是渐近稳定的,但衰减到平衡态的速率在很大程度上取决于自由界面处是否考虑了表面张力。本文的目的是更好地了解衰减率的线性化动力学的研究中,表面张力算子被替换为一个更一般的分数阶微分算子,这使我们能够连续插值之间的情况下,没有表面张力和表面张力的情况下,通过研究的泛化。我们研究了衰减的线性化问题的广义算子的选择和水平横截面。在一个周期性的横截面的情况下,我们确定了一个临界阶的微分算子,在该阶的衰减率从几乎指数到指数的过渡。

英文摘要:

In this paper we consider a slab of viscous incompressible fluid bounded above by a free boundary, bounded below by a flat rigid interface, and acted on by gravity. The unique equilibrium is a flat slab of quiescent fluid. It is well-known that equilibria are asymptotically stable but that the rate of decay to equilibrium depends heavily on whether or not surface tension forces are accounted for at the free interface. The aim of the paper is to better understand the decay rate by studying a generalization of the linearized dynamics in which the surface tension operator is replaced by a more general fractional-order differential operator, which allows us to continuously interpolate between the case without surface tension and the case with surface tension. We study the decay of the linearized problem in terms of the choice of the generalized operator and in terms of the horizontal cross-section. In the case of a periodic cross-section we identify a critical order of the differential operator at which the decay rate transitions from almost exponential to exponential.

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