Papers › Step size control for explicit relaxation Runge-Kutta methods preserving invariants
Step size control for explicit relaxation Runge-Kutta methods preserving invariants
Sebastian Bleecke, Hendrik Ranocha
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Many time-dependent differential equations are equipped with invariants. Preserving such invariants under discretization can be important, e.g., to improve the qualitative and quantitative properties of numerical solutions. Recently, relaxation methods have been proposed as small modifications of standard time integration schemes guaranteeing the correct evolution of functionals of the solution. Here, we investigate how to combine these relaxation techniques with efficient step size control mechanisms based on local error estimates for explicit Runge-Kutta methods. We demonstrate our results in several numerical experiments including ordinary and partial differential equations.
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