We extend previous work on nonstandard finite difference schemes for one-space dimension, nonlinear reaction-diffusion PDEs to the case where linear advection is included. The use of a positivity condition allows the determination of a functional relation between the time and space step-sizes, and p
Nonstandard finite difference schemes for reaction-diffusion equations
โ Scribed by Ronald E. Mickens
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 270 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0749-159X
No coin nor oath required. For personal study only.
โฆ Synopsis
We construct finite difference schemes for a particular class of one-space dimension, nonlinear reactiondiffusion PDEs. The use of nonstandard finite difference methods and the imposition of a positivity condition constrain the schemes to be explicit and allow the determination of functional relations between the space and time step-sizes. The general procedure is illustrated by applying it to several important model systems of PDEs c 1999
๐ SIMILAR VOLUMES
Approximating convection-dominated diffusion equations requires a very accurate scheme for the convection term. The most famous is the method of backward characteristics, which is very precise when a good interpolation procedure is used. However, this method is difficult to implement in 2D or 3D. Th
An artificial-viscosity finite-difference scheme is introduced for stabilizing the solutions of advectiondiffusion equations. Although only the linear one-dimensional case is discussed, the method is easily susceptible to generalization. Some theory and comparisons with other well-known schemes are
We present an explicit fourth-order compact ยฎnite dierence scheme for approximating the threedimensional convectionยฑdiusion equation with variable coecients. This 19-point formula is deยฎned on a uniform cubic grid. We compare the advantages and implementation costs of the new scheme with the standar
A positivity condition is used to obtain functional relations between the time and space step-sizes for nonstandard finite-difference models of the Fisher partial differential equation. An upper bound is also derived for the solutions to the difference equations.
We construct a finite difference scheme for the ordinary differential equation describing the traveling wave solutions to the Burgers equation. This difference equation has the property that its solution can be calculated. Our procedure for determining this solution follows closely the analysis used