Hi I want to simulate the quantity of disolved oxygen in water depending on temperatura. I créate my model but I have some problems, My model is the next one:

I create an eulerian multiphase model. My primary phase is water + disolved oxyegen (density depending on temperatura by udf) and my secondary phase is dummy oxygen + oxygen (volumen weighted density). Then I apply species mass transfer from water disolved oxygen to the gaseous oxygen and I actívate henrys law. In my initialization conditions I put the quantity of disolved oxygen of my primary phase (mass fraction of disolved oxygen = 0.0083) and the mass fraction of dummy oxygen = 1. Also I put a small quantity of volumen fraction of my secondary phase to actívate the mass transfer (volumen fraction of secondary phase = 0,006). Then I simulate in transuient model because if I put steady because of the complexity of the simulation I have floating point errors. Is this model correct?

My results are not very logical, the mass fraction of my secondary phase (oxygen gas) always is 0 so the is no mass transfer from primary to secondary phase. Also the volumen fraction of my secondary phase is very small like maximun 1e-20. Why it can be the reason of that?

Thanks