NUMERICAL METHODS FOR ONE-DIMENSIONAL REACTION-DIFFUSION EQUATIONS ARISING IN COMBUSTION THEORY
Juan I. Ramos
A review of numerical methods for one-dimensional reaction-diffusion equations arising in combustion theory is presented. The methods reviewed include explicit, implicit, quasilinearization, time linearization, operator-splitting, random walk and finite-element techniques and methods of lines. Adaptive and non-adaptive procedures are also reviewed. These techniques are applied first to solve two model problems which have exact traveling wave solutions with which the numerical results can be compared. This comparison is performed in terms of both the wave profile and computed wave speed. It is shown that the computed wave speed is not a good indicator of the accuracy of a particular method. A fourth-order time-linearized, Hermitian compact operator technique is found to be the most accurate method for a variety of time and space sizes. The accuracy of this time-linearization technique degrades as large time steps are used in the calculations. Adaptive and moving finite-difference and finite-element methods are shown to be very accurate techniques which do not require as much computer time as non-adaptive methods.
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