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arXiv · 2409.19424

Wave evolution within the Cubic Vortical Whitham equation

Marcelo V. Flamarion·Efim Pelinovsky
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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.

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Marcelo V. Flamarion, Efim Pelinovsky. 2024-09-28. Wave evolution within the Cubic Vortical Whitham equation. https://arxiv.org/abs/2409.19424

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