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current and temperature dependent conductivity (sigma(T,j) )

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Dear all,

I am trying to model a conducting wire, where the conductivity depends both on the actual temperature and the actual current density. The temperature dependence is no problem. But I don´t know how to add the j dependecny.

I am using the electric current and heat tansfer modules. Is it only possible to solve linear equations?
Sigma(T,j) would be non-linear, as j also depends on the temperature.


Thanks for any help or comments

1 Reply Last Post 05.06.2013, 13:58 GMT-4
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Hello Robert Werner

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Posted: 1 decade ago 05.06.2013, 13:58 GMT-4
Hi Robert,

I am actually trying to simulate the same nonlinear conductivity as in your case. I tried to simply make a conductivity that is a function of the current density, but I get an error when I do this. I know you posted your question a while ago, but I was wondering if you figured out how to implement this nonlinear conductivity in COMSOL. I would greatly appreciate any help or hints you can give me. Thanks
Hi Robert, I am actually trying to simulate the same nonlinear conductivity as in your case. I tried to simply make a conductivity that is a function of the current density, but I get an error when I do this. I know you posted your question a while ago, but I was wondering if you figured out how to implement this nonlinear conductivity in COMSOL. I would greatly appreciate any help or hints you can give me. Thanks

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