Energy-preserving continuous-stage partitioned Runge-Kutta methods

Abstract

In this paper, we present continuous-stage partitioned Runge-Kutta (csPRK) methods for energy-preserving integration of Hamiltonian systems. A sufficient condition for the energy preservation of the csPRK methods is derived. It is shown that the presented condition contains the existing condition for energy-preserving continuous-stage Runge-Kutta methods as a special case. A noticeable and interesting result is that when we use the simplifying assumptions of order conditions and the normalized shifted Legendre polynomials for constructing high-order energy-preserving csPRK methods, both the Butcher "weight" coefficients $B_{\tau }$ and ${\hat{B}}_{\tau }$ must be equal to $1$. As illustrative examples, new energy-preserving integrators are acquired by virtue of the presented condition, and for the sake of verifying our theoretical results, some numerical experiments are reported.

The paper needs to be improved.

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• Energy-preserving continuous-stage Runge-Kutta-Nyström methods
• Energy-preserving integration of non-canonical Hamiltonian systems by continuous-stage methods