2000 character limit reached
On the Parametric Instability Caused by Step Size Variation in Runge-Kutta-Nyström Methods (1209.5173v1)
Published 24 Sep 2012 in math.NA and cs.NA
Abstract: The parametric instability arising when ordinary differential equations (ODEs) are numerically integrated with Runge-Kutta-Nystr\"om (RKN) methods with varying step sizes is investigated. It is shown that when linear constant coefficient ODEs are integrated with RKN methods that are based on A-stable Runge-Kutta methods, the solution is nonincreasing in some norm for all positive step sizes, constant or varying. Perturbation methods are used to quantify the critical step sizes associated with parametric instability.