Abstract
Energy-preserving algorithms, as one of the core research areas in numerical ordinary differential equations, have achieved great success by many methods such as symplectic methods and discrete gradient methods. This paper considers the numerical integration of quasi-bi-Hamiltonian systems, which, as a generalization of bi-Hamiltonian systems, can be expressed in two distinct ways: \({\dot{y}} = P _ { 1 } ( y ) \nabla H _ { 2 }(y) = \frac{1}{\rho (y)}P _ { 2 } ( y ) \nabla H _ { 1 }(y)\). The quasi-bi-Hamiltonian systems have two Hamiltonians \(H_1(y)\) and \(H_2(y)\). Conventional discrete gradient methods can only preserve one Hamiltonian at a time. In this paper, based on discrete gradient and projection, new energy-preserving integrators that can preserve the two Hamiltonians simultaneously are proposed. They show better qualitative behaviours than traditional discrete gradient methods do. Numerical integrations of Hénon-Heiles type systems and the Korteweg-de Vries (KdV) equation are conducted to show the effectiveness of the new integrators in comparison with traditional discrete gradient methods.
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Acknowledgements
The research was supported in part by the Natural Science Foundation of China under Grant 12371403 and 12371433, the National Natural Science Foundation of Jiangsu under Grant BK20200587.
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Liu, K., Fu, T., Shi, W. et al. A new type of energy-preserving integrators for quasi-bi-Hamiltonian systems. J Math Chem (2024). https://doi.org/10.1007/s10910-024-01624-6
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DOI: https://doi.org/10.1007/s10910-024-01624-6
Keywords
- Quasi-bi-Hamiltonian systems
- Energy-preserving integrators
- The discrete gradient methods
- Projection algorithm
- Hénon-Heiles type systems
- Korteweg-de Vries equation