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LiveLink for MATLAB 'mphinterp' Li_Thermal_3D example

Posted 2024年12月5日 GMT+8 02:51 Interfacing, Battery Design, LiveLink for MATLAB Version 6.2 2 Replies

Emmanuel Lorenzo-Perez
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Hi,

I am using the 'Thermal Modeling of a Cylindrical Lithium-Ion Battery in 3D' model (link below) as a reference for a battery analysis I am performing. I am using LiveLink for MATLAB to extract the temperature results but I am having a hard time with the mphinterp() function. I have t following:

model = mphload('libatterythermal3d')
coord = [0 0 0.04];
T = mphinterp(model, 'T', 'coord', coord]

Error: Cannot Evaluate Expression
Undefined variable.
-Variable: T
-Geometry: geom1
-Domain: 1
Failed to evaluate expression:

  1. Any suggestion on how to get the values I want?
  2. Is there a way to display the available variables to extract values?

Link: https://www.comsol.com/model/thermal-modeling-of-a-cylindrical-lithium-ion-battery-in-3d-10224

2 Replies Last Post 2024年12月6日 GMT+8 01:20
Lars Gregersen COMSOL Employee

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Posted: 6 months ago 2024年12月5日 GMT+8 18:31
Updated: 6 months ago 2024年12月5日 GMT+8 21:31

There are a few issues.

When using LiveLink for MATLAB all coordinates are in column format. I.e. you have to use coord' instead of coord.

You have to specify the dataset. I assume for this model dset9 makes sense.

For these type of components you have to specify that you want to evaluate on domains.

This should work:

T = mphinterp(model, 'T', 'coord', coord','dataset','dset9','edim','domain')

Note that the expression can be any valid COMSOL expression not just a variable or field name. I recommend that you open the COMSOL GUI (using the command mphlaunch) and find some expressions to use there.

-------------------
Lars Gregersen
Comsol Denmark
There are a few issues. When using LiveLink for MATLAB all coordinates are in column format. I.e. you have to use coord' instead of coord. You have to specify the dataset. I assume for this model dset9 makes sense. For these type of components you have to specify that you want to evaluate on domains. This should work: T = mphinterp(model, 'T', 'coord', coord','dataset','dset9','edim','domain') Note that the expression can be any valid COMSOL expression not just a variable or field name. I recommend that you open the COMSOL GUI (using the command mphlaunch) and find some expressions to use there.
Emmanuel Lorenzo-Perez
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Posted: 6 months ago 2024年12月6日 GMT+8 01:20
Updated: 6 months ago 2024年12月6日 GMT+8 03:02

Hi Lars, Thanks for the quick respond. I am still learning Livelink functions and how to edit and extract the information/results via ML. Your line worked perfectly, I was playing a bit to extract velocity values and I created a new dataset/study/selection and selected the flow domain for the velocity and it worked too for a point and cutline.

Hi Lars, Thanks for the quick respond. I am still learning Livelink functions and how to edit and extract the information/results via ML. Your line worked perfectly, I was playing a bit to extract velocity values and I created a new dataset/study/selection and selected the flow domain for the velocity and it worked too for a point and cutline.

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