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3D mf excitation in power
Posted 30.11.2015, 05:31 GMT-5 Low-Frequency Electromagnetics Version 5.1 0 Replies
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I want to impose a desired power Pv (inducted by Joule heating) on a conductive boundary in a 3D model with mf physic. The power on this boundary can be calculated with mf.Qsh [W].
I use an impedance boudary condition for this boundary and I apply also a coupling operator intop1.
The coil is excited a with external current density feature on which, I try to impose the current density depending on the value of intop1(mf.Qsh).
I have add an global ODE + DAE, in which I have created a variable diffP = Pv - intop1(mf.Qsh)
The imposed current density is equal to:
Js=sqrt((Pv-diffP)/r0)/coilsection (maybe wrong expression...)
where r0 is the global electrical resistance (P=r0I^2)
It doesn't work... Comsol can't evalutate diffP, why?
error:
For mesh-case 0 there are 1 void equations (empty rows in matrix) for the variable mod1.diffP.
at coordinates: (0,0,0), ...
In Segregated Step:
Returned solution is not converged.
- Feature: Stationary Solver 1 (sol1/s1)
or in trying different solver configurations:
Failed to find a solution.
Segregated Step 1
System matrix is zero.
In Segregated Step 1:
Returned solution is not converged.
I need help please.
Best regards
Julien
Attachments:
Hello Julien Givernaud
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