Error in Fluent with Euler + combustion?

Aris Nikolopoulos

I have the following problem. I have converged a two face flow (Euler - Euler (granular)) cold flow (transient solution). When I tried to introduce a third combusting lagrangian phase a had severe problems with Energy equation. Trying to understand the problem, I tried to solve only the two Euler phases + the Energy equation (simple case, the two fluids enter with 600 kelvin and the walls have 1100 kelvin). I got a correct solution for a lot of seconds, but for a period of time (20 solution sec) mean temperature increased to 2000k!!! In this period all equation did converge.

The problem is severe!!! Do you believe that this is an error of Fluent? When i use the mixture model, i don't have any problems in temperature (but this model is insufficient for my applycation). Does anybody have the same problem?

I would appriciate your help!