A friend of mine recently made me aware of this group and I wanted to mention an ongoing project in France dedicated to simulation for the geothermal industry. It is a CFD Fortran code. I wrote many of the routines and/or adapted many of them from Numerical Recipes.
I don’t know if my expertise could be of any help here, but as union makes strength, I am happy to join, share my experience if you have questions and keep you posted of this adventure. If you are interested to know more please visit : www.cofluco.com