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

Posted 4 nov. 2019, 03:38 UTC−5 MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Studies & Solvers Version 5.4 2 Replies

Vasudha Agrawal
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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 7 nov. 2019, 07:00 UTC−5
Magnus Ringh COMSOL Employee

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Posted: 5 years ago 4 nov. 2019, 07:23 UTC−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
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Posted: 5 years ago 7 nov. 2019, 07:00 UTC−5
Updated: 5 years ago 7 nov. 2019, 07:00 UTC−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.

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