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The Dynamics of Periodic Traveling Interfacial Electrohydrodynamic Waves: Bifurcation and Secondary Bifurcation

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Abstract

In this paper, we consider two-dimensional periodic capillary-gravity waves traveling under the influence of a vertical electric field. The full system is a nonlinear, two-layered, free boundary problem. The interface dynamics are derived by coupling Euler equations for the velocity field of the fluid with voltage potential equations governing the electric field. We first introduce the naive flattening technique to transform the free boundary problem into a fixed boundary problem. We then prove the existence of small-amplitude electrohydrodynamic waves with constant vorticity using local bifurcation theory. Moreover, we show that these electrohydrodynamic waves are formally stable in the linearized sense. Furthermore, we obtain a secondary bifurcation curve that emerges from the primary branch, consisting of ripple solutions on the interface. As far as we know, such solutions in electrohydrodynamics are established for the first time. It is worth noting that the electric field \(E_0\) plays a key role in controlling the shapes and types of waves on the interface.

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Acknowledgements

Dai was supported by National Natural Science Foundation of China (No. 12371110). Xu was supported by the Postdoctoral Science Foundation of China (2023M731381). Zhang was supported by National Natural Science Foundation of China (No. 12301133), the Postdoctoral Science Foundation of China (No. 2023M741441, No. 2024T170353) and Jiangsu Education Department (No. 23KJB110007). The authors would like to express their gratitude to Professor Ian Tobasco for his serious and responsible handling of the manuscript. The authors would also like to thank the referees for their valuable comments and suggestions.

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Correspondence to Yong Zhang.

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Dai, G., Xu, F. & Zhang, Y. The Dynamics of Periodic Traveling Interfacial Electrohydrodynamic Waves: Bifurcation and Secondary Bifurcation. J Nonlinear Sci 34, 99 (2024). https://doi.org/10.1007/s00332-024-10085-9

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