Menu

Discussion Forum

New Discussion
Filtern

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.

Undefined variable error message

Posted 29.08.2018, 01:38 GMT-4 Electromagnetics, Electromagnetic Heating, Low-Frequency Electromagnetics Version 5.2 3 Replies

Minna Theres James
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi, I am new to comsol.I have created a geometry which has 1[cm] width ,0.05cm depth and 0.5 cm height nickel alloy block on which there is a platinum strip of widht,0.05[cm].depth,0.005[cm],height,0.5[cm] to study the Joule heating due to current flow through platinum strip. On computing it shows the following error message: 'Undefined variable. -Variable:material.sigma13 -Geometry:geom1 -Domain:1-2 Failed to evaluate variable. -Variable:comp1.ec.sigmaaxz -Defined as:material.sigma13 Failed to evaluate variable. -Variable:comp1.ec.Jix -Defined as:(comp1.ec.Ezcomp1.ec.sigma Failed to evaluate variable. -Variable:comp1.ec.Jx -Defined as:comp1.ec.Jix Failed to evaluate expression. -Expression:d(((comp1.ec.Jxtest(comp1.V> Failed to evaluate Jacobian of expression. -Expression:((comp1.ec.Jx*(comp1.Vx)+

Please help me to find out what the error means and what should I do to compute the program.

3 Replies Last Post 19.11.2018, 17:30 GMT-5
Mickaël Barsive COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 6 years ago 29.08.2018, 10:52 GMT-4
Updated: 6 years ago 29.08.2018, 10:53 GMT-4

Hello,

It seems that the electrical conductivity (more precisely the 13 component) is not defined. Please check in "Material" nodes if the material is well assigned to the domain 1 and 2.

For more help, please contact the COMSOL technical support.

Best regards,

Mickaël

Hello, It seems that the electrical conductivity (more precisely the 13 component) is not defined. Please check in "Material" nodes if the material is well assigned to the domain 1 and 2. For more help, please contact the COMSOL technical support. Best regards, Mickaël
Minna Theres James
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 6 years ago 31.08.2018, 01:01 GMT-4

Thank you. I was able to solve the issue.

With regards, Minna

Thank you. I was able to solve the issue. With regards, Minna
Simran Kaur
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 6 years ago 19.11.2018, 17:30 GMT-5
Updated: 6 years ago 19.11.2018, 17:30 GMT-5

Hi,

I am encountering a similar problem, I have a multiphysics analysis though - Heat Transfer and Solid Mechanics. I have defined the Young's Modulus as a piecewise function (pw1) under the global definitions with the variable 'p' as the vertical stress. When it is called for, under the 'Linear Elastic Strain' node of the Solid Mechanics Interface as pw1(p), I get an error saying that 'p' is an unknown variable.

Can you please help me regarding that? I have attached my file here.

Thanks, Simran

Hi, I am encountering a similar problem, I have a multiphysics analysis though - Heat Transfer and Solid Mechanics. I have defined the Young's Modulus as a piecewise function (pw1) under the global definitions with the variable 'p' as the vertical stress. When it is called for, under the 'Linear Elastic Strain' node of the Solid Mechanics Interface as pw1(p), I get an error saying that 'p' is an unknown variable. Can you please help me regarding that? I have attached my file here. Thanks, Simran

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