Convection-Diffusion Test (Problems) Matrices

The convection-diffusion equation is of the form

-[Uxx + Uyy + Re( p(x,y)Ux + q(x,y)Uy )] = f(x,y).

Test Problem 1 (no recirculation).

Test Problem 2 (recirculation).

Test Problem 3 (recirculation).

Here are the Fortran codes for

I do not plan to have too many similar test problems to confuse users, but if you can convince me that a particular test problem is better than the one that I put in here, I would be happy to make a change. However, a test problem with discontinuities may be added.
Here are some relavent references.

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