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Posted Aug 17, 2021, 7:13 p.m. EDT Electromagnetics, Semiconductor Devices, Microfluidics 3 Replies

Jacob Leckie
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Hi, I got this error and the more information option on the error took me to a page that didn't have more information. I can see there is more to this error than 'undefined variable' but I don't actualy know what it is refferenceing. " Undefined variable. - Variable: comp1.solid.mises - Geometry: geom1 - Boundaries: 289-301 Failed to evaluate expression. - Expression: comp1.solid.mises - Plot: Surface 1 "

thank you for any consideration.

3 Replies Last Post Aug 19, 2021, 2:46 a.m. EDT
Jeff Hiller COMSOL Employee

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Posted: 3 years ago Aug 18, 2021, 5:18 p.m. EDT

Hi Jacob,

All I can tell without seeing your .mph file is that your model is trying to evaluate the von Mises stress on boundaries 289 through 301, on which it is not defined properly. But you probably knew that already :). Please post your .mph file for -hopefully- more useful comments.

Best,

Jeff

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Jeff Hiller
Hi Jacob, All I can tell without seeing your .mph file is that your model is trying to evaluate the von Mises stress on boundaries 289 through 301, on which it is not defined properly. But you probably knew that already :). Please post your .mph file for -hopefully- more useful comments. Best, Jeff
Jacob Leckie
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Posted: 3 years ago Aug 18, 2021, 7:32 p.m. EDT

Absolutly right Jeff, a frustraited oversight on my part.

Absolutly right Jeff, a frustraited oversight on my part.
Magnus Ringh COMSOL Employee

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Posted: 3 years ago Aug 19, 2021, 2:46 a.m. EDT

Hi Jacob,

The reason for the error is that your Solid Mechanics physics interface isn't assigned to any domain. If you add Domain 1 (which I assume is the solid) to it, then the plot works. I'm not sure if that's the correct or way to set up the simulation that you had in mind, but it does at least fix the error.

Best,

Magnus Ringh, COMSOL

Hi Jacob, The reason for the error is that your Solid Mechanics physics interface isn't assigned to any domain. If you add Domain 1 (which I assume is the solid) to it, then the plot works. I'm not sure if that's the correct or way to set up the simulation that you had in mind, but it does at least fix the error. Best, Magnus Ringh, COMSOL

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