Helical kelvin waves for the 3D Euler equation

TL;DR

This paper rigorously proves the existence of helical Kelvin waves in the 3D Euler equations, confirming prior conjectures and extending Kelvin wave theory from 2D to 3D helically symmetric flows.

Contribution

It provides a rigorous mathematical proof of helical Kelvin waves in 3D Euler equations, using linearization and bifurcation theory, extending previous 2D results.

Findings

Existence of m-fold symmetric helical Kelvin waves in 3D Euler equations confirmed.

Extension of Kelvin wave theory from 2D to 3D helically symmetric flows.

Verification of prior dispersion relation predictions.

Abstract

Helical Kelvin waves were conjectured to exist for the 3D Euler equations in Lucas and Dritschel \cite{LucDri} (as well as in \cite{Chu}) by studying dispersion relation for infinitesimal linear perturbations of a circular helically symmetric vortex patch. This paper aims to rigorously establish the existence of these $m$-fold symmetric helical Kelvin waves, in both simply and doubly connected cases, for the 3D Euler equations. The construction is based on linearization of contour dynamics equations and bifurcation theory. Our results rigorously verify the prediction in aforementioned papers and extend $m$-waves of Kelvin from the 2D Euler equations to the 3D helically symmetric Euler equations.