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2 Replies
Last post: July 31, 2010 1:31pm UTC
July 30, 2010 8:14am UTC
Modeling Microwave heating
Hello
I am trying to model Microwave heating-structure interaction and keep getting errors:
Failed to evaluate expression.
- Expression: conj(sign((mod1.mh.Pin/mod1.mh.pModeFlow 1)))
Failed to evaluate variable.
- Variable: mod1.mh.pModeFlow 1
- Defined as: mod1.mh.intport1(if((imag(mod1.mh.alphaport 1)==0),1,(((real(((mod1.mh.tE0modex 1*conj(mod1.mh.tH0modey 1))-(conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modey 1)))*mod1.mh.nz)+((real(((mod1.mh.tE0modey 1*conj(mod1.mh.tH0modez 1))-(mod1.mh.tE0modez 1*conj(mod1.mh.tH0modey 1))))*mod1.mh.nx)+(mod1.mh.ny*real(((conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modez 1)+(mod1.mh.tE0modex 1*(-conj(mod1.mh.tH0modez 1))))))))*0.5)))
Failed to evaluate expression.
- Expression: mod1.mh.intport1(if((imag(mod1.mh.alphaport 1)==0),1,(((real(((mod1.mh.tE0modex 1*conj(mod1.mh.tH0modey 1))-(conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modey 1)))*mod1.mh.nz)+((real(((mod1.mh.tE0modey 1*conj(mod1.mh.tH0modez 1))-(mod1.mh.tE0modez 1*conj(mod1.mh.tH0modey 1))))*mod1.mh.nx)+(mod1.mh.ny*real(((conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modez 1)+(mod1.mh.tE0modex 1*(-conj(mod1.mh.tH0modez 1))))))))*0.5)))
Failed to evaluate expression.
- Expression: if((imag(mod1.mh.alphaport 1)==0),1,(((real(((mod1.mh.tE0modex 1*conj(mod1.mh.tH0modey 1))-(conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modey 1)))*mod1.mh.nz)+((real(((mod1.mh.tE0modey 1*conj(mod1.mh.tH0modez 1))-(mod1.mh.tE0modez 1*conj(mod1.mh.tH0modey 1))))*mod1.mh.nx)+(mod1.mh.ny*real(((conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modez 1)+(mod1.mh.tE0modex 1*(-conj(mod1.mh.tH0modez 1))))))))*0.5))
Failed to evaluate expression.
- Expression: if((imag(mod1.mh.alphaport 1)==0),1,(((real(((mod1.mh.tE0modex 1*conj(mod1.mh.tH0modey 1))-(conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modey 1)))*mod1.mh.nz)+((real(((mod1.mh.tE0modey 1*conj(mod1.mh.tH0modez 1))-(mod1.mh.tE0modez 1*conj(mod1.mh.tH0modey 1))))*mod1.mh.nx)+(mod1.mh.ny*real(((conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modez 1)+(mod1.mh.tE0modex 1*(-conj(mod1.mh.tH0modez 1))))))))*0.5))
Failed to evaluate expression.
- Expression: if((imag(mod1.mh.alphaport 1)==0),1,(((real(((mod1.mh.tE0modex 1*conj(mod1.mh.tH0modey 1))-(conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modey 1)))*mod1.mh.nz)+((real(((mod1.mh.tE0modey 1*conj(mod1.mh.tH0modez 1))-(mod1.mh.tE0modez 1*conj(mod1.mh.tH0modey 1))))*mod1.mh.nx)+(mod1.mh.ny*real(((conj(mod1.mh.tH0modex 1)*mod1.mh.tE0modez 1)+(mod1.mh.tE0modex 1*(-conj(mod1.mh.tH0modez 1))))))))*0.5))
Failed to evaluate operator.
- Operator: if
- Geometry: 1
- Boundary: 1
Failed to evaluate expression.
- Expression: imag(mod1.mh.alphaport 1)
Failed to evaluate variable.
- Variable: mod1.mh.alphaport 1
- Defined as: sqrt((((pi*11.627906976744187)^2)+(-(mod1.mh.k^2))))
Attempt to evaluate real square root of negative number.
- Function: sqrt
Does anyone know what this means. I am new to comsol and this is definitely not an easy task for me.
Thank you
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July 30, 2010 11:44am UTC in response to Huang Jonson
Re: Modeling Microwave heating
Hi
I agree that these error messages are rather complex to read, COMSOL could do better (and will probably in the future versions). Normally those should be red from the end towards the beginning, so the initial error of the chain (the way I udnerstand it is) your "mod1.mh.k" that is too large and gives a negative srt() function hence an "error trap". You can follow where it is used by reading themn from the bottom towards the top
It's obviously linked to your definition of alpha of port 1 in your model
To better understand where the variables are used turn on the "equations" in the "Options>Preferences"
--
Good luck
Ivar
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July 31, 2010 1:31pm UTC in response to Ivar Kjelberg
Re: Modeling Microwave heating
Hi Ivar
Thanks for your reply,
I would try to understand where the variables are used turn on the "equations".
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