## Analysis & PDE

• Anal. PDE
• Volume 6, Number 6 (2013), 1429-1533.

### Decay of viscous surface waves without surface tension in horizontally infinite domains

#### Abstract

We consider a viscous fluid of finite depth below the air, occupying a three-dimensional domain bounded below by a fixed solid boundary and above by a free moving boundary. The fluid dynamics are governed by the gravity-driven incompressible Navier–Stokes equations, and the effect of surface tension is neglected on the free surface. The long-time behavior of solutions near equilibrium has been an intriguing question since the work of Beale (1981).

This is the second in a series of three papers by the authors that answers the question. Here we consider the case in which the free interface is horizontally infinite; we prove that the problem is globally well-posed and that solutions decay to equilibrium at an algebraic rate. In particular, the free interface decays to a flat surface.

Our framework utilizes several techniques, which include

1. a priori estimates that utilize a “geometric” reformulation of the equations;
2. a two-tier energy method that couples the boundedness of high-order energy to the decay of low-order energy, the latter of which is necessary to balance out the growth of the highest derivatives of the free interface;
3. control of both negative and positive Sobolev norms, which enhances interpolation estimates and allows for the decay of infinite surface waves.

Our decay estimates lead to the construction of global-in-time solutions to the surface wave problem.

#### Article information

Source
Anal. PDE, Volume 6, Number 6 (2013), 1429-1533.

Dates
Accepted: 15 November 2012
First available in Project Euclid: 20 December 2017

https://projecteuclid.org/euclid.apde/1513731413

Digital Object Identifier
doi:10.2140/apde.2013.6.1429

Mathematical Reviews number (MathSciNet)
MR3148059

Zentralblatt MATH identifier
1292.35206

#### Citation

Guo, Yan; Tice, Ian. Decay of viscous surface waves without surface tension in horizontally infinite domains. Anal. PDE 6 (2013), no. 6, 1429--1533. doi:10.2140/apde.2013.6.1429. https://projecteuclid.org/euclid.apde/1513731413

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