Numerical solution of differential equations using special methods
Abstract
In the present thesis we examine systems of first-order ordinary differential equations with oscillating solutions which are integrated numerically. For their solution we use explicit Runge-Kutta methods that integrate exactly a set of special functions. The thesis consists of two main parts. In the first part we work on the properties of phase-lag and dissipation. At first we construct a family of methods with fifth algebraic order and constant or variable coefficients with maximized or infinite order of phase-lag respectively. We test these methods along with a group of classical methods in five known problems with oscillating solutions. Afterwards we construct a method with fifth algebraic order, infinite order of phase-lag and infinite order of dissipation and compare it with other methods during the integration of three known orbital problems. In the second part we study the radial one-dimensional time-independent Schrodinger equation and construct two families of exponentially-fi ...
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