Characterizing Strong Stability Preserving Additive Runge-Kutta Methods

Authors:
Inmaculada Higueras
Affiliations:
Departamento de Ingeniería Matemática e Informática, Universidad Pública de Navarra, Pamplona, Spain 31006
Venue:
Journal of Scientific Computing
Year:
2009

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Abstract

Space discretization of some time dependent partial differential equations give rise to ordinary differential equations containing additive terms with different stiffness properties. In these situations, additive Runge-Kutta (additive RK) methods are used.For additive RK methods the curve of absolute monotonicity gives stepsize restrictions for monotonicity. Necessary conditions for nontrivial curves of absolute monotonicity are the nonnegativity of the additive RK coefficients and some inequalities on some incidence matrices. In this paper we characterize strong stability preserving additive Runge-Kutta methods giving some order barriers and structural properties.