Wave evolution within the Cubic Vortical Whitham equation
Abstract
In this work, we study the evolution of disturbances within the framework of the Cubic Vortical Whitham (CV-Whitham) equation, considering both positive and negative cubic nonlinearities. This equation plays important role for description of the wave processes in the presence of shear flows. We find well-formed breather-type structures arising from the evolution of depression disturbances with positive cubic nonlinearity. For elevation disturbances, the results are two-fold. When the cubic nonlinearity is negative, we show that the CV-Whitham equation and the Gardner equation are qualitatively similar, differing only by a small phase lag due to differences in the dispersion term. However, with positive cubic nonlinearity, the differences between the solutions become more pronounced, with the CV-Whitham equation producing sharper waves that suggest the onset of wave breaking.
Cite
@article{arxiv.2409.19424,
title = {Wave evolution within the Cubic Vortical Whitham equation},
author = {Marcelo V. Flamarion and Efim Pelinovsky},
journal= {arXiv preprint arXiv:2409.19424},
year = {2024}
}