Document Type
Article
Rights
This item is available under a Creative Commons License for non-commercial use only
Disciplines
Applied mathematics
Abstract
In this paper, Runge-Kutta-Gegenbauer (RKG) stability polynomials of arbitrarily high order of accuracy are introduced in closed form. The stability domain of RKG polynomials extends in the the real direction with the square of polynomial degree, and in the imaginary direction as an increasing function of Gegenbauer parameter. Consequently, the polynomials are naturally suited to the construction of high order stabilized Runge-Kutta (SRK) explicit methods for systems of PDEs of mixed hyperbolic-parabolic type.
We present SRK methods composed of L ordered forward Euler stages, with complex-valued stepsizes derived from the roots of RKG stability polynomials of degree $L$. Internal stability is maintained at large stage number through an ordering algorithm which limits internal amplification factors to 10 L2. Test results for mildly stiff nonlinear advection-diffusion-reaction problems with moderate (< 1) mesh P\'eclet numbers are provided at second, fourth, and sixth orders, with nonlinear reaction terms treated by complex splitting techniques above second order.
DOI
https://doi.org/10.1016/j.jcp.2019.03.001
Recommended Citation
O'Sullivan, S. (2019) Runge–Kutta–Gegenbauer explicit methods for advection-diffusion problems, Journal of Computational Physics, Vol. 388, 1 July 2019, Pages 209-223, doi.org/10.1016/j.jcp.2019.03.001
Publication Details
Journal of Computational Physics
Volume 388, 1 July 2019, Pages 209-223
https://authors.elsevier.com/a/1YoKw508HiFnA