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arXiv · 2505.15225

Hamiltonian reductions, scalings, and effective wave models in stratified fluids

Gregorio Falqui·Eleonora Sforza
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Abstract

We apply Poisson reduction techniques to describe asymptotic fully nonlinear models of 2-layer sharply stratified fluids in the Hamiltonian framework. We start by considering the Benjamin Hamiltonian formalism for a stably stratified 2D Euler fluid in a channel of finite height. We use a Marsden-Ratiu reduction scheme for sharply stratified fluids to obtain a canonical formulation of the stratified effective model in one space variable. A canonical form of the long-wave Serre-Green Naghdi (SGN) equations is then recovered by means of a suitable double scaling limit in the Hamiltonian function. Applying the previous results to such a formulation of the SGN equations, we provide the Miyata Choi-Camassa (MCC) equations for fully non-linear waves in sharply stratified fluids with a natural Hamiltonian structure and discuss the reduced Hamiltonian system obtained taking the natural constraints of the MCC equations into account. To this end, we perform a Dirac-type reduction on a suitable constrained submanifold of fluid field configurations. We finally consider a different scaling limit of the fully non-linear model which leads to a local Boussinesq-type model in the large-lower layer regime.

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Gregorio Falqui, Eleonora Sforza. 2025-05-21. Hamiltonian reductions, scalings, and effective wave models in stratified fluids. https://arxiv.org/abs/2505.15225

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