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Failed to evaluate variable.
Posted 20 giu 2011, 14:25 GMT-4 Low-Frequency Electromagnetics, RF & Microwave Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 4.3 2 Replies
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I was trying to run an impedance calculation on a square copper coil in air. I am using a trial version of comsol. It gives me the following error:
Failed to evaluate variable
variable: mod1.emw.ahPortx
Geometry: 1
Boundary: 33
failure to evaluate expression
expression ((((mod1.emw.ahPortx*mod1.tEx)+ (mode1.tEy*mod1.emw.ahPorty))+(mod1.emw.ahPortz*mod1.tEz))/mod1.emw.wPort)
Failure to evaluate expression
expression ((((mod1.emw.ahPortx*mod1.tEx)+ (mode1.tEy*mod1.emw.ahPorty))+(mod1.emw.ahPortz*mod1.tEz))/mod1.emw.wPort)
Failure to evaluate expression
Expression: mod1.emw.intlport1(((((mod1.emw.ahPortx*mod1.tEx)+(mod1.tEy*mod1.emw.ahPorty))+(mod1.emw.ahPortz*mod1.tEz))/mod1.emw.wPort))
variable mod1.emw.Vport_1
defined as :mod1.emw.intlport1(((((mod1.emw.ahPortx*mod1.tEx)+(mod1.tEy*mod1.emw.ahPorty))+(mod1.emw.ahPortz*mod1.tEz))/mod1.emw.wPort))
variable: mod1.emw.Zport_1
defined as: (mod1.emw.Vpodt_1/mod1.emw.Iport_1)
failed to evaluate expression.
Expression: abs(mod1.emw.Zport_1)
Failed to evaluate expression
Expressiong: abs(mod1.emw.Zport_1)
Plot:glob1(Global)
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I had similar problems with uniform lumped ports. It worked after I changed it to user defined ports specifiying height and width of the port. I don't know why the uniform port didn't work and also COMSOL support couldn't help.
I am using 4.1.
Cheers
Edgar
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From what i see from the other threads, it also depends on luck?
For some it works while for the others it does not.
Any idea on that?