Trigonometrically fitted multi-step Runge-Kutta methods for solving oscillatory initial value problems

Trigonometrically fitted multi-step Runge-Kutta methods for solving oscillatory initial value... In this paper, trigonometrically fitted multi-step Runge-Kutta (TFMSRK) methods for the numerical integration of oscillatory initial value problems are proposed and studied. TFMSRK methods inherit the frame of multi-step Runge-Kutta (MSRK) methods and integrate exactly the problem whose solutions can be expressed as the linear combinations of functions from the set of { exp ( i wt ) , exp ( − i wt ) } , $\{\exp (\mathrm {i}wt),\exp (-\mathrm {i}wt)\},$ or equivalently the set { cos ( wt ) , sin ( wt ) } $\{\cos (wt),\sin (wt)\}$ , where w represents an approximation of the main frequency of the problem. The general order conditions are given and four new explicit TFMSRK methods with order three and four, respectively, are constructed. Stability of the new methods is examined and the corresponding regions of stability are depicted. Numerical results show that our new methods are more efficient in comparison with other well-known high quality methods proposed in the scientific literature. Numerical Algorithms Springer Journals

Trigonometrically fitted multi-step Runge-Kutta methods for solving oscillatory initial value problems

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Springer US
Copyright © 2017 by Springer Science+Business Media New York
Computer Science; Numeric Computing; Algorithms; Algebra; Theory of Computation; Numerical Analysis
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