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arXiv · 1307.0661

Explicit exponential Runge-Kutta methods of high order for parabolic problems

Vu Thai Luan·Alexander Ostermann
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Abstract

Exponential Runge-Kutta methods constitute efficient integrators for semilinear stiff problems. So far, however, explicit exponential Runge-Kutta methods are available in the literature up to order 4 only. The aim of this paper is to construct a fifth-order method. For this purpose, we make use of a novel approach to derive the stiff order conditions for high-order exponential methods. This allows us to obtain the conditions for a method of order 5 in an elegant way. After stating the conditions, we first show that there does not exist an explicit exponential Runge-Kutta method of order 5 with less than or equal to 6 stages. Then, we construct a fifth-order method with 8 stages and prove its convergence for semilinear parabolic problems. Finally, a numerical example is given that illustrates our convergence bound.

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Vu Thai Luan, Alexander Ostermann. 2013-07-02. Explicit exponential Runge-Kutta methods of high order for parabolic problems. https://doi.org/10.1016/j.cam.2013.07.027

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