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.

computation error in simulation of electrostatic cantilever (application library example)

Posted 04.11.2019, 03:38 GMT-5 MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Studies & Solvers Version 5.4 2 Replies

Vasudha Agrawal
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello,

I am trying to simulate electrostatically actuated cantilever example from applecation library of MEMES module. But after compution receiving following error.

  • Feature: Stationary Solver 1 (sol1/s1) Undefined value found.
  • Detail: Undefined value found in the equation residual vector. There are 7587 degrees of freedom giving NaN/Inf in the vector for the variable comp1.spatial.u. at coordinates: (0,0,0), (1e-05,0,0), (2e-05,0,0), (0,0,5e-07), (0,0,1e-06), ... There are 7587 degrees of freedom giving NaN/Inf in the vector for the variable comp1.spatial.v. at coordinates: (0,0,0), (1e-05,0,0), (2e-05,0,0), (0,0,5e-07), (0,0,1e-06), ... There are 7587 degrees of freedom giving NaN/Inf in the vector for the variable comp1.spatial.w. at coordinates: (0,0,0), (1e-05,0,0), (2e-05,0,0), (0,0,5e-07), (0,0,1e-06), ...

I followed the instruction given in PDF attached

2 Replies Last Post 07.11.2019, 07:00 GMT-5
Magnus Ringh COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 5 years ago 04.11.2019, 07:23 GMT-5

Hi,

This error seems to be caused by the definition of Young's modulus in Material 2. In your model, it's 153 Pa but it should be a billion times larger, 153 GPa, defined as 153[GPa] in the text field for that property. If you want to compare the model that you have created with one in the COMSOL Multiphysics Application Libraries, for example, use the Compare tool in the Developer toolbar. It can help you find discrepancies in the model setup.

Best regards,

Magnus Ringh, COMSOL

Hi, This error seems to be caused by the definition of Young's modulus in Material 2. In your model, it's 153 Pa but it should be a billion times larger, 153 GPa, defined as `153[GPa]` in the text field for that property. If you want to compare the model that you have created with one in the *COMSOL Multiphysics Application Libraries*, for example, use the **Compare** tool in the **Developer** toolbar. It can help you find discrepancies in the model setup. Best regards, Magnus Ringh, COMSOL
Vasudha Agrawal
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 5 years ago 07.11.2019, 07:00 GMT-5
Updated: 5 years ago 07.11.2019, 07:00 GMT-5

Hi,

This error seems to be caused by the definition of Young's modulus in Material 2. In your model, it's 153 Pa but it should be a billion times larger, 153 GPa, defined as 153[GPa] in the text field for that property. If you want to compare the model that you have created with one in the COMSOL Multiphysics Application Libraries, for example, use the Compare tool in the Developer toolbar. It can help you find discrepancies in the model setup.

Best regards,

Magnus Ringh, COMSOL

Thank you so much for the help. Now it works.

>Hi, > >This error seems to be caused by the definition of Young's modulus in Material 2. In your model, it's 153 Pa but it should be a billion times larger, 153 GPa, defined as `153[GPa]` in the text field for that property. If you want to compare the model that you have created with one in the *COMSOL Multiphysics Application Libraries*, for example, use the **Compare** tool in the **Developer** toolbar. It can help you find discrepancies in the model setup. > >Best regards, > >Magnus Ringh, COMSOL Thank you so much for the help. Now it works.

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