If we take an advection equation, for simplicity of writing we have assumed , and
we may add a diffusion term, again for simplicty, we assume the diffusion to be constant over the entire field.
Giving us an equation of the form:
We may now rewrite the equation on the following form:
The term below is called streamline diffusion.
Any diffusion orthogonal to the streamline diffusion is called crosswind diffusion, for us this becomes the term:
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