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Charge transport convergance at low potentials
Posted Nov 5, 2010, 12:21 a.m. EDT 0 Replies
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I've been working on a transient 1D charge transport problem that involves diffusion and migration between two layers separated by a membrane. The solver seems to evaluate a solution when the voltage applied is 0.8V, but for a smaller applied voltage (0.2V for example), consistent initial values cannot be found. This seems a bit counterintuitive for me as I would expect the higher voltage to result in sharper gradients and therefore be more difficult to solve, however the opposite is the case here.
In this problem the concentration of some of the mobile species is determined by the potential (a capacitive behaviour), so a lower applied potential corresponds to smaller initial concentrations for the solver to work with. Might this situation indicate that my relative and absolute tolerances should be tighter? Reducing them delays the solver from throwing an error, but at the expense of solver termination (by either convergance or error).
Any insight is greatly appreciated,
Thanks!
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Hello Aaron
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