Discussion Forum

Hi

what kind of non-linratiry ?

if its a dependence on T or J or B, it is "just" to do as many material characteristics of the Material library, find one in the defult Material library and copy the methodology for your case

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Good luck
Ivar

First of all you should get an expression (or experimental data) for the conductivity.

If the conductivity depends on J or even B, you might run into a "circular reference" problem. Then you need to use a different approach like the H-formulation. Also, note that the conductivity is the mass matrix of your PDE in the AC/DC module. You do not want to have a nonlinear mass matrix as the time dependent solver might go a bit crazy. In either case, for starters, you can just test using a expression that resembles the overall dependence and see how things go.
Best Regards,

Victor

Its dependence is sigma(E), where sigma is conductivity of ZnO (S/m), E - electric field strength (V/m). This conductivity is non-linear and usually should be set manually using table. Is it possible in COMSOL to set such table dependence sigma(E) so easy as it is in QuickField? (www.quickfield.com/advanced/telec2.htm). If yes, then how? I´ll be appreciated for any help.

Hi

in COMSOL you can set any input to any equation (or almost ;I, load in your data into an interpolation function under the material propery (check an example from the default material library, many materials are T or pA dependent

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Good luck
Ivar