Derivation of dissipative Boussinesq equations using the Dirichlet-to-Neumann operator approach

TL;DR

This paper derives dissipative Boussinesq equations for water waves using asymptotic expansions of the Dirichlet-to-Neumann operator, incorporating viscosity effects to better match experimental data.

Contribution

It introduces a novel derivation of dissipative Boussinesq equations based on the D2N operator, unifying different asymptotic methods.

Findings

Derived equations incorporate viscosity effects.

Both methods yield consistent systems.

Enhances modeling of real water wave phenomena.

Abstract

The water wave theory traditionally assumes the fluid to be perfect, thus neglecting all effects of the viscosity. However, the explanation of several experimental data sets requires the explicit inclusion of dissipative effects. In order to meet these practical problems, the theory of visco-potential flows has been developed (see P.-F. Liu & A. Orfila (2004) and D. Dutykh & F. Dias (2007)). Then, usually this formulation is further simplified by developing the potential in an entire series in the vertical coordinate and by introducing thus, the long wave approximation. In the present study we propose a derivation of dissipative Boussinesq equations which is based on asymptotic expansions of the Dirichlet-to-Neumann (D2N) operator. Both employed methods yield the same system by different ways.