Pressure outlet and back flow

eric

Hi,

I'm simulating combustion in a furnace. I want to set the flue exit as a pressure outlet, however I am not sure what is meant by the boundary condition 'back flow total temperature' required by the model.

Is the back flow total temperature the temperature you'd expect at the exit or is it the atmospheric temperature? Fluent says to apply realistic values. My expected temperatures at the flue exit are 1100K approx and exits to the atmosphere of 300K.

Which value should I use?

Thanks

Eric