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Complex unit i in Comsol

Posted Dec 20, 2012, 9:00 a.m. EST 2 Replies

Marouane Frini
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Hi

I'd like to simulate a variable containing the complex unit i.

I'd like to calculate the voltage V = i*2*pi*f*S*B with i the complex unit.I read the docs and found that i and j are supported as complex units. So, I entered "i*2*pi*0.8540*mf.normB" as an expression in the simulation result. The problem is, I get 0 as a solution ( and I get a right value when I delete the "i"). So it seems there 's a problem with the complex unit i.

What is the right way to do so, please ?

Thanks
2 Replies Last Post Dec 20, 2012, 1:47 p.m. EST
Edgar Kaiser
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Posted: 1 decade ago Dec 20, 2012, 9:09 a.m. EST
Hi,

I recently learned that many post processing function only display the real part of a complex quantity. This would be zero in your case because your expression is purely imaginary.
Try the abs() or imag() function on your expression and see what comes out.

Cheers,
Edgar
Hi, I recently learned that many post processing function only display the real part of a complex quantity. This would be zero in your case because your expression is purely imaginary. Try the abs() or imag() function on your expression and see what comes out. Cheers, Edgar
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Dec 20, 2012, 1:47 p.m. EST
Hi

the plots show the real part (by default), but table values are complex if required (automatically by default) at least that is my impression ;)

--
Good luck
Ivar
Hi the plots show the real part (by default), but table values are complex if required (automatically by default) at least that is my impression ;) -- Good luck Ivar

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