Advection Equation

Part of the Texts in Applied Mathematics book series (TAM, volume 52)


We now begin the study of numerical wave propagation. Everyone has experience with traveling waves, whether it is waves on a lake, sound waves, or perhaps an earthquake or two. It is not particularly difficult to write down a reasonable-looking finite difference approximation to a wave equation. Most of the effort is invested in trying to determine whether the method actually works. There are unique complications for numerical wave propagation, and so to introduce the ideas we use one of the simplest mathematical equations that produces traveling waves. This is the advection equation, given as
$$ \frac{{\partial u}} {{\partial t}} + a\frac{{\partial u}} {{\partial x}} = 0,{\text{ }}for\left\{ \begin{gathered} - \infty < x < \infty , \hfill \\ 0 < t, \hfill \\ \end{gathered} \right. $$
where u(x, 0) = g(x). It is assumed that a is a positive constant.


Heat Equation Truncation Error Method Stable Upwind Scheme Implicit Method 
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© Springer Science+Business Media, LLC 2007

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