Abstract
The direct Lyapunov method is used to prove the stability of the exact Crapper solution for capillary waves. The dynamic equations of the capillary wave are presented in the form of an infinite Euler-Lagrange chain of equations for the Stokes coefficients. The stationary solution found for these equations is the Crapper solution for capillary waves. With the help of energy and momentum conservation laws the Lyapunov function is constructed. It is shown that the Lyapunov function is positive definite with respect to any perturbations of waves surfaces, for waves with the period multiple of wavelength.
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References
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Acknowledgements
The study has been supported by the Russian Science Foundation (project N 14-19-01633) in IPMech RAS.
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Petrov, A., Lopushanski, M., Vanovskiy, V. (2018). Stability of Capillary Waves of Finite Amplitude. In: Ntalianis, K., Croitoru, A. (eds) Applied Physics, System Science and Computers. APSAC 2017. Lecture Notes in Electrical Engineering, vol 428. Springer, Cham. https://doi.org/10.1007/978-3-319-53934-8_7
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DOI: https://doi.org/10.1007/978-3-319-53934-8_7
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