Source Term for Joule Heating
Hi,
I am currently setting up a simulation for Joule heating. So far I have produced a field of the electrical potential V using the laplacian solver. I guess the next step would be to map this field to a simulation that solves the heat equation. I guess, a solution would be to add a source term to the laplacian solver of the form grad V^2 / rho, (rho is the resistivity and a scalar field variable), and then map the potential field V to that and solve. Here my question: how do I modify the solver equation to include the source term grad V^2 / rho? I guess it's not too tricky but I don't know how to implement the square. Thanks for your help. 
I guess the sqr() function is what you are looking for? The programmers guide has a good overview of functions like that in section 1.4.1 / P23ff (referring to OF1.5).

Thanks! I will chase that up.
Tom 
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