Does any body know where can I get 2d free source code(F77 or C) for solving 2 equation model with finite element. Thank!

Try this http://www.featflow.de/ I've tried it and it is very well documented. The only difficulty with this code is the definition of the first mesh.

Thank you very much,.. Your response is very helpful for me. I visited that site, and it is very well documented.

Thank you.