Abstract
To integrate large systems of locally coupled ordinary differential equations with disparate timescales, we present a multirate method with error control that is based on the Cash–Karp Runge–Kutta formula. The order of multirate methods often depends on interpolating certain solution components with a polynomial of sufficiently high degree. By using cubic interpolants and analyzing the method applied to a simple test equation, we show that our method is fourth order linearly accurate overall. Furthermore, the size of the region of absolute stability is increased when taking many “micro-steps” within a “macro-step.” Finally, we demonstrate our method on three simple test problems to confirm fourth order convergence.
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Notes
We use the word “interpolation” to describe a method to construct a smooth approximation to the numerical solution between two times \(t_n\) and \(t_{n+1}\). However, the function that we derive does not pass through the numerical solution at \(t_{n+1}\). Strictly speaking, it is not an interpolant. Nevertheless, we still refer to these approximating functions as “interpolants.”
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Acknowledgments
The author thanks R. R. Rosales who stimulated the author’s interest in multirate methods and proposed the derivation of cubic interpolants.
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Appendix: Matrix Definitions
Appendix: Matrix Definitions
Here we given the definitions of the matrices in Eqs. (17–19).
where for matrices \(Z\) and \(M = \left[ \begin{array}{ccc} M_{00} &{} M_{01} &{} M_{02} \\ M_{10} &{} M_{11} &{} M_{12} \\ M_{20} &{} M_{21} &{} M_{22} \end{array}\right] \), we define
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Fok, PW. A Linearly Fourth Order Multirate Runge–Kutta Method with Error Control. J Sci Comput 66, 177–195 (2016). https://doi.org/10.1007/s10915-015-0017-4
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DOI: https://doi.org/10.1007/s10915-015-0017-4