Abstract
We present novel geometric numerical integrators for Hunter–Saxton-like equations by means of new multi-symplectic formulations and known Hamiltonian structures of the problems. We consider the Hunter–Saxton equation, the modified Hunter–Saxton equation, and the two-component Hunter–Saxton equation. Multi-symplectic discretisations based on these new formulations of the problems are exemplified by means of the explicit Euler box scheme, and Hamiltonian-preserving discretisations are exemplified by means of the discrete variational derivative method. We explain and justify the correct treatment of boundary conditions in a unified manner. This is necessary for a proper numerical implementation of these equations and was never explicitly clarified in the literature before, to the best of our knowledge. Finally, numerical experiments demonstrate the favourable behaviour of the proposed numerical integrators.
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Acknowledgements
We greatly appreciate the refrees’ comments on an earlier version. We would like to thank Marcus Wunsch and Xavier Raynaud for interesting discussions. DC acknowledges support from UMIT Research Lab at Umeå University and the FY2012 Researcher Exchange Program between the Japan Society for the Promotion of Science and the Royal Swedish Academy of Sciences. YM, FD and TM acknowledge supprt from JSPS KAKENHI Grant Numbers 25287030, 15H03635, 16KT0016, 16K17550, 17H02826.
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Miyatake, Y., Cohen, D., Furihata, D. et al. Geometric numerical integrators for Hunter–Saxton-like equations. Japan J. Indust. Appl. Math. 34, 441–472 (2017). https://doi.org/10.1007/s13160-017-0252-1
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DOI: https://doi.org/10.1007/s13160-017-0252-1
Keywords
- Hunter–Saxton equation
- Modified Hunter–Saxton equation
- Two-component Hunter–Saxton equation
- Multi-symplectic formulation
- Numerical discretisation
- Geometric numerical integration
- Discrete variational derivative method
- Multi-symplectic schemes
- Euler box scheme