[hsn]

Dear friends,
I want to model a simple duct in a solid. water goes through the duct to cool the solid. so here we have tow zones 1-solid 2-fluid.
i want to know how to model the boundary that lay between tow domains for fluent. i tried tow ways and both of them was unsuccessful:

1. i build a model in DM, I modeled tow domains by freezing the duct and enclosure command {as it is in coiling heat tutorial} then i started an advanced mesh with this model. the output for ansys worked but for fluent, it didn't work. there came two boundary as interface and fluent said one of them do not belongs to a zone.
2. i made two IGS models one for duct and 1 for solid. i imported the duct to ICME and then the solid. it asked me if i wanna merge them or replace and i selected to merge. it seemed that i have the solid and the duct with each other. everything went good and fluent read the mesh without problem. but the result showed that fluent had not recognized the duct since no fluid entered the duct.

so help me with this:

• how can i model the duct and the solid at the same time in ICEM, and how should i prepare it for fluent.

thank you in advance for your time and consideration.
HSN.