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Air solubility in water

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Old   August 16, 2016, 09:20
Default Air solubility in water
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Hello,

I'm trying to model a tank half filled with water, half filled with air with the mixture multiphase model. I have one pressure outlet and one massflow inlet.

What I want to simulate is the solubility of oxygen and nitrogen in the water, and that after a pressure drop oxygen and nitrogen will be released into the air (due to Henry's law). So I activated species-mass_transfer with Henry's law.

Before I even simulate the pressure drop, I just want to have the molar concentration of oxygen and nitrogen to due to the partial pressure in the air above the water.

After patching a molar concentration to the liquid which is near to the expected one, setting a very small timestep(up to e-06), setting the URFs all to 0.1 and using the most robust solver settings (first order), the solution still diverges directly.

Is anybody simulating something similar? Does anybody have an idea what the problem could be?

Thanks in advance
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divergence, henry, law, solubility

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