Dear Sir/Madam,
My name is Eldhose. I am very much interested in your project. I am a Chemical Engineer and right now I am doing PhD research. I was an employee of ANSYS INC and I have ample experience with Fluent package. I get the feeling that your problem can be solved by using either Euler-granular multiphase model or a DPM model depends on the density. If you would like me to write a udf, I can do that with ease. In addition, I have worked on a similar project which was to model a blast furnace with combustion. 14 days is a very optimistic number considering the fact that we might have to optimize the mesh size and try out different models to which one will suit your problem the best.
In addition, the bid amount is still negotiable.
Let me know if you are interested
Kind regards
Eldhose