July 22, 2019 at 1:18 pmrachels1001Subscriber
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?
July 22, 2019 at 1:34 pmDrAmineAnsys Employee
Is the saturation temperature a non constant value? Are you using a table or profile for it?
July 22, 2019 at 1:51 pmrachels1001Subscriber
I've been using constant values of 373.15 K for normal water-evaporation and 573.15 K for bound-water evaporation
July 22, 2019 at 1:57 pm
July 22, 2019 at 2:23 pmDrAmineAnsys Employee
July 22, 2019 at 5:54 pmrachels1001SubscriberThe 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?
July 22, 2019 at 8:33 pmrachels1001Subscriber
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.
July 23, 2019 at 4:43 amDrAmineAnsys EmployeeThanks for the update. Please mark this as Is Solved.
July 23, 2019 at 4:45 amDrAmineAnsys EmployeePlease update to the latest versions as there were some issues when using more than one mass transfer mechanism which have been fixed.
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