Numerical integration of ODEs while preserving all polynomial first integrals

08/14/2021

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by   Benjamin K. Tapley, et al.

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We present a novel method for solving ordinary differential equations (ODEs) while preserving all polynomial first integrals. The method is essentially a symplectic Runge-Kutta method applied to a reformulated version of the ODE under study and is illustrated through a number of examples including Hamiltonian ODEs, a Nambu system and the Toda Lattice. When applied to certain Hamiltonian ODEs, the proposed method yields the averaged vector field method as a special case.