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Lee evaporation model in Ansys CFX with CEL expressions

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Old   October 25, 2022, 10:56
Default Lee evaporation model in Ansys CFX with CEL expressions
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Steffen
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Hello,
I'm trying to model evapoartion of water in Ansys cfx with the Lee model.
The CEL expressions are not difficult to implement, but I guess I made something wrong with the source definitions in the subdomains.
The setup is very simple (pic below), a fluid domaine is filled with saturated water and has a heated wall at the bottom.
Fluid1 is saturated water and Fluid2 is saturated water in gas state. Initialy the domain is filled with liquid water.

The walltemperature is 10 K above the saturation temperature.
I used the following expressions:

The sources (mass and energy) are bound in this way:


The mass transfer is not working. I don't have a clue what's wrong.
Maybe someone has an idea


Greetings
Steffen
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Old   October 25, 2022, 17:55
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Glenn Horrocks
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Why don't you use the built in boiling model? There are a few models built into CFX, in this case I suspect the non-equilibrium boiling model may be suitable.
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Old   October 26, 2022, 02:53
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Because additionally, I intend to use the build in cavitation model. Unfortunately, cfx allows only one mass transfer at a time in the GUI
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Old   October 26, 2022, 05:46
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You are trying to model cavitation and boiling? Good luck with that one, I trust you are a CFD expert. This is not something to be attempted by beginners.

Your source term is a function of volume fraction but you have not defined a source term volume fraction coefficient. You are probably going to need to set the source term coefficient to get it to converge. But your source term is a horrible step function which is going to be very difficult to converge at the best of times - it may well never converge.
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