[anon_m]

Hello:
I am trying to write a udf to define the heat transfer coeff. in thermal non equilibrium porous zone. The model is 2d-axisymmetric.

Attached is the schematic of the model. I need to calculate following variables:

1- averaged density and temperature at B-inlet.
2- averaged density at zone B.

I don't know how to refer to a interior surface to get the properties. should I define an interface when creating the mesh or I could get the cell by some other means?

I appreciate any suggestions