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Diffusion Advection equation discretization scheme

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Old   July 2, 2013, 16:10
Default Diffusion Advection equation discretization scheme
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I am looking for a good reference to understand the basic discretization schemes applied to the Stationary Diffusion Advection equation.
-\epsilon \frac{d^2u(x)}{dx^2}+\beta \frac{du(x)}{dx}=0
Especially for the Upwind and the Scharfetter-Gummel schemes.

Thank you in advance.
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advection, diffusion, discretization scheme, upwind

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