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The <I>G</I>-functions Series Method Adapted to the Numerical Integration of Parabolic PDE
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作者 Mónica cortés-molina José Antonio Reyes Fernando García-Alonso 《Journal of Applied Mathematics and Physics》 2018年第1期161-173,共13页
The Method Of Lines (MOL) and Scheifele’s G-functions in the design of algorithms adapted for the numeric integration of parabolic Partial Differential Equations (PDE) in one space dimension are applied. The semi-dis... The Method Of Lines (MOL) and Scheifele’s G-functions in the design of algorithms adapted for the numeric integration of parabolic Partial Differential Equations (PDE) in one space dimension are applied. The semi-discrete system of ordinary differential equations in the time direction, obtained by applying the MOL to PDE, is solved with the use of a method of Adapted Series, based on Scheifele’s G-functions. This method integrates exactly unperturbed linear systems of ordinary differential equations, with only one G-function. An implementation of this algorithm is used to approximate the solution of two test problems proposed by various authors. The results obtained by the Dufort-Frankel, Crank-Nicholson and the methods of Adapted Series versus the analytical solution, show the results of mistakes made. 展开更多
关键词 SERIES METHOD Numerical Solutions PARABOLIC Initial-Boundary Value Problems METHOD of Lines
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Numerical Integration of Forced and Damped Oscillators through a New Multistep Method
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作者 M. cortés-molina F. García-Alonso J. A. Reyes 《Journal of Applied Mathematics and Physics》 2019年第10期2440-2458,共19页
Forced and damped oscillators appear in the mathematical modelling of many problems in pure and applied sciences such as physics, engineering and celestial mechanics among others. Although the accuracy of the T-functi... Forced and damped oscillators appear in the mathematical modelling of many problems in pure and applied sciences such as physics, engineering and celestial mechanics among others. Although the accuracy of the T-functions series method is high, the calculus of their coefficients needs specific recurrences in each case. To avoid this inconvenience, the T-functions series method is transformed into a multistep method whose coefficients are calculated using recurrence procedures. These methods are convergent and have the same properties to the T-functions series method. Numerical examples already used by other authors are presented, such as a stiff problem, a Duffing oscillator and an equatorial satellite problem when the perturbation comes from zonal harmonics J2. 展开更多
关键词 Numerical Solutions of ODE’s PERTURBED and DAMPED Oscillators Initial Value Problems (IVP) MULTISTEP Methods
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