Menu

Discussion Forum

New Discussion
Filtra

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Error message: Failed to evaluate expression. Failed to evaluate operator. Failed to evaluate variable.

Posted 17 mag 2011, 08:08 GMT-4 Low-Frequency Electromagnetics, MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Studies & Solvers Version 4.4 3 Replies

LiWah Wong
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi people

I have been encountering this error message:

Failed to evaluate expression.
- Expression: d(d((-(mod1.chds.nx*mod1.chds.u+mod1.chds.ny*mod1.chds.v+mod1.chds.nz*mod1.chds.w)*mod1.c*test(mod1.c))*(dvol),{test@1}),mod1.c)
Failed to evaluate operator.
- Operator: mean
- Geometry: 1
- Boundary: 42 81 82

I have been working around with boundary conditions, initial values suchlike, but I am not sure if I am on the right track because I either receive the error message above or this error message:

Failed to evaluate expression.
- Expression: mod1.p-mod1.dl.p0
Failed to evaluate variable.
- Variable: mod1.dl.p0
- Defined as: (g const*(mod1.dl.H0*mod1.dl.rho))
Failed to evaluate operator.
- Operator: mean
- Geometry: 1
- Boundary: 42 81 82 83

Why are all these error messages?

Thanks in advanced!

regards
Liwah
3 Replies Last Post 31 mar 2014, 17:16 GMT-4
COMSOL Moderator

Hello LiWah Wong

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Mohammad Mostakhdemin
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 26 mar 2014, 03:52 GMT-4
I am also have the same error what should we do

Thanks in advanced

Regards Mohammad
I am also have the same error what should we do Thanks in advanced Regards Mohammad
David
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 31 mar 2014, 17:11 GMT-4


--
D
-- D
David
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 31 mar 2014, 17:16 GMT-4
same here

I am trying to plot the resistance(x-axis) vs voltage(y-axis) 1D relation by fixing the vibration frequency at 72Hz ,but it gave me error: "Failed to evaluate variable "

I have added 2 physics : AC/DC circuit and piezo-electric device

I have set up "Parametric sweep" of resistor from 1e5 to 1e6 ( 10 steps)

I have added frequency domain study by fixing the vibration frequency at 72Hz and select fully coupled

I am not sure if I set up studies correctly , should I add "stationary study" after "frequency domain" study?
or should I use "frequency domain model" study?

I am confused
same here I am trying to plot the resistance(x-axis) vs voltage(y-axis) 1D relation by fixing the vibration frequency at 72Hz ,but it gave me error: "Failed to evaluate variable " I have added 2 physics : AC/DC circuit and piezo-electric device I have set up "Parametric sweep" of resistor from 1e5 to 1e6 ( 10 steps) I have added frequency domain study by fixing the vibration frequency at 72Hz and select fully coupled I am not sure if I set up studies correctly , should I add "stationary study" after "frequency domain" study? or should I use "frequency domain model" study? I am confused

Attachments:

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content