[JensW]

Hello everybody,

i have got some problems to exchange radiation energy between Fluent and an external solver. At first some facts to my simulation case:

- i am simulating a small wood burner for domestic heating
- using DOM, because p1 model doesn't work for my case.
- coupling Fluent with an external solver for the fixed bed. I am exchange mass and heat transfer between the external solver and Fluent.

I want to couple the radiation exchange between fixed bed and gas phase by a surface. This surface should have the external radiation temperature of the fixed bed surface.

I have the following problems:

- i find no options to exchange radiation energy over an interior surface

- i tried to seperate the mesh above the fixed bed. Then i had an outlet at the lower mesh zone and an inlet at the mesh zone above. I wrote an udf to interpolate between the outlet and the inlet to "merge" these both zones. Except that recirculating zones can't be realised in this separated part, this way works well. But for an inlet i can just consider a global black body temperature for the inlet. However, i prefer to use a temperature profile.

- I tried also to use a wall at the upper mesh part instead of an inlet. Then i tried to use this wall as an inlet by means of an UDF to merge the both mesh parts. That doesn't work, because Fluent does not respect modified cell data. Anybody tried to use a wall as an inlet?

- The last chance i see is to implement the DOM model per UDF in Fluent myself.

Has anybody any suggestions or maybe tried to implement DOM by means of an UDF? Maybe there is an alternative and i can't see it!

Thanks in advance for your help

Jens