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Time derivative of a surface integration in 4.3
Posted 29 déc. 2012, 05:58 UTC−5 0 Replies
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I'm using the magnetic field (mf) physic in time dependent study. I want to calculate the voltage V(t), as v(t) = - d/dt(flux phi) (time derivative of the magnetic flux). I serched the docs and found that's accomplished using the differentiation operator : d(variable,t) on the simulation result.
Since the magnetic flux is not supported as a variable by comsol. I have to evaluate it using surface integration (derived values node), as flux = surface integral (B ds) with B the magnetic flux density evaluated by comsol.
The problem is that the surface integration give me the magnetic flux phi as a defined value in a table and I just can't use it to for the time derivative I'm needing.
Is there any solution de get a surface integration of the flux density B as an actual variable or is there any other way to calcutate the magnetic flux Phi ?
Thanks a lot !
Hello Marouane Frini
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