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[Tertiary Current Distribution] Electrode Current (boundary condition)
Posted 11.04.2014, 04:49 GMT-4 Battery Design Version 4.3b 0 Replies
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I'm new to COMSOL and numerical modeling and I'm currently trying to understand the "Electrode Current" node in the "Tertiary Current Distribution" physics using the v_flow_battery example from the model library (positive cell). Maybe someone can clarify things up for me: Basically that node sets a boundary condition for the electronic potential by specifing a total current over the whole boundary. Unfortunately it is not clear to me, how this is done numerically.
Basically I would expect that the electronic potential is changed until the integral over the current density distribution at the boundary meets the electronic current condition (i.e. the boundary integral over the specified average current density (parameter: i_avg)). The potential then should be determined by the specific electrical conductivity of the boundary material (parameter: sigma_e).
If I set a boundary probe to evaluate the average electronic current density (tcdee.NormIs) on the boundary, then it doesn't match the specified boundary condition. Why is that so?
I'd really appreciate some helpful comments on this,
Christian
Hello Christian S.
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