Learning Forum

[rachels1001]

I've been using the Lee Model to model evaporation-condensation in a Eulerian multiphase simulation w Fluent. My evaporation and condensation coefficients were 0.3, but then I changed it to 0.1, as the Fluent User guide recommends. I haven't started fine-tuning them yet. 

When I run the simulation, I am getting the error message that there is an "Error at Node 0: The computed saturation temperature <= 0.0". The pressures specified in the simulation initialization range from -4700 Pa to 30 Pa gauge; however, I have run previous versions of this simulation with the same evaporation constants and pressures without errors. 

Is there any commonly known pitfalls that cause this kind of error?

Thanks!

Claire

[DrAmine]

Is the saturation temperature a non constant value? Are you using a table or profile for it? 

[rachels1001]

I've been using constant values of 373.15 K for normal water-evaporation and 573.15 K for bound-water evaporation

[rachels1001]

[DrAmine]

Which version?

[rachels1001]

The case was created in 19.2 and it does run on my computer in version 19.2.

However, due to computational power requirements, I have to run the simulation on a network with only earlier versions (18.2). This is where I receive the error about sub zero calculated saturation temperature.

Is it possible there is a problem with the backwards compatibility?

[rachels1001]

Update: It was because I was creating a file in version 19.2 and running it in version 18.2. I recreated the fluent case file in 19.1 and ran it on the network with the same version and the error no longer appeared. 

[DrAmine]

Thanks for the update. Please mark this as Is Solved.

[DrAmine]

Please update to the latest versions as there were some issues when using more than one mass transfer mechanism which have been fixed.