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Vanadium Redox Flow Battery, Model ID: 14153, negative Concentrations

Posted 30 oct. 2013, 10:16 UTC−4 Fluid & Heat, Battery Design, Chemical Reaction Engineering, Results & Visualization, Studies & Solvers 1 Reply

Michael Remy
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Dear COMSOL Community,
I have a question regarding negative Concentrations in the example Vanadium Redox Flow Battery, Model ID: 14153 that is posted in the model gallery. (www.comsol.com/model/vanadium-redox-flow-battery-14153)
If the inlet velocity is reduced to 3[ml/min]/(wCell*L_e) then the concentration of V2/V5 is negative. How is this possible or how can you avoid this?

Kind regards,
Michael Remy
1 Reply Last Post 6 nov. 2013, 13:00 UTC−5
Michael Remy
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Posted: 1 decade ago 6 nov. 2013, 13:00 UTC−5
If nobody works on the same specific topic, is there any general advice you could give me on negative concentration? I tried with denser meshes, but the problem stays the same. There is the possibility of using Logarithms and e-functions, but I don't really like this approach because I don't know how it will effect my solutions.

I am hoping for some help.

Kind regards,

Michael
If nobody works on the same specific topic, is there any general advice you could give me on negative concentration? I tried with denser meshes, but the problem stays the same. There is the possibility of using Logarithms and e-functions, but I don't really like this approach because I don't know how it will effect my solutions. I am hoping for some help. Kind regards, Michael

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