Computational efficiency of symplectic integration schemes: application to multidimensional disordered Klein–Gordon lattices
Department of Mathematics and Applied Mathematics, University of Cape Town,
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Received in final form: 31 January 2018
Published online: 4 October 2018
We implement several symplectic integrators, which are based on two part splitting, for studying the chaotic behavior of one- and two-dimensional disordered Klein–Gordon lattices with many degrees of freedom and investigate their numerical performance. For this purpose, we perform extensive numerical simulations by considering many different initial energy excitations and following the evolution of the created wave packets in the various dynamical regimes exhibited by these models. We compare the efficiency of the considered integrators by checking their ability to correctly reproduce several features of the wave packets propagation, like the characteristics of the created energy distribution and the time evolution of the systems’ maximum Lyapunov exponent estimator. Among the tested integrators the fourth order ABA864 scheme [S. Blanes et al., Appl. Numer. Math. 68, 58 (2013)] showed the best performance as it needed the least CPU time for capturing the correct dynamical behavior of all considered cases when a moderate accuracy in conserving the systems’ total energy value was required. Among the higher order schemes used to achieve a better accuracy in the energy conservation, the sixth order scheme s11ABA82_6 exhibited the best performance.
© EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature, 2018