Learning Forum

[sajjan pokhrel]

I am modeling a natural porous media model, underground pipe heat exchanger for geothermal power generation. The ground is a porous media, and it is found out that the fluid temperature is different than the rock temperature-so trying to use the LTNE model.
I have different layers representing different rock thermal properties in the model. In need to apply LTNE in one of the layers. As soon I click LTNE model-it generates a new domain coinciding with the  existing domain. It also generates additional walls. 
For eg: there are three walls where the heat exchanger connects with the grout (layer between heat exchanger and ground), there are three walls: two walls are from porous fluid zones and i can easily apply 'coupled' wall boundary condition, whereas for the additional wall generated; I chose to 'via system coupling' boundary condition.
I see there is no heat transfer at all from this wall with this boundary condition. 
could you please tell me if this the correct BC in this situation, if yes, why there is not heat transfer at all from this wall?

[Rob]

The LTNE model? 

[sajjan pokhrel]

Apologies for the confusion, I meant non-equillibrium thermal model in porous media.

[Rob]

Look at what the model does. I can't remember what the outer boundary is, but it should be covered in the User's Guide.