3D and 1D couple simulation with Fluent
 

I have a simple question!!!
I want to simulate a furnace with Fluent.
Modeling of furnace consist of 3D firebox and 1D reacting flow on coils.
How to coupled 3D and 1D models and simulate furnace with Fluent.
Do I can use UDF for 1D model?
How?

Thanks in advance.

Esmaeil