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How to assign a parameter to each grid cell by COMSOL with MATLAB?

Posted Jul 12, 2016, 9:54 a.m. EDT Interfacing, Mesh Version 4.3 3 Replies

Jia Liu
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For example, in Darcy model, in order to realize heterogeneity for model, different permeability parameters which may satisfy a kind of distribution function should be assigned to each grid cell. How to call the grid information to assign value by COMSOL with MATLAB before calculation. In attach file, 'heterogeneity1.m' is a m. file for a simple PDE model and parameter k is permeability metioned above. The grid information is give in 'mesh.m'. Thanks for your attention!

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3 Replies Last Post Aug 15, 2016, 8:32 p.m. EDT
Lars Gregersen COMSOL Employee

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Posted: 8 years ago Jul 14, 2016, 3:08 a.m. EDT
Hi

In order to use measured data in a Comsol model you can use an Interpolation Table. It doesn't matter if you have access to Matlab or not the procedure is the same and I recommend that you use the Comsol Desktop to set up your model.

You can read in your data for the interpolation table from a file, but you have to reformat your data to a file format that can be read by Comsol. The data formats are described in the Programming Reference Manual (previously called the COMSOL API Reference Manual).

We introduced a new Matlab function in Comsol 5.0 called mphinterpolationfile that can be used to generate these data file from Matlab data.

--
Lars Gregersen
Comsol Denmark
Hi In order to use measured data in a Comsol model you can use an Interpolation Table. It doesn't matter if you have access to Matlab or not the procedure is the same and I recommend that you use the Comsol Desktop to set up your model. You can read in your data for the interpolation table from a file, but you have to reformat your data to a file format that can be read by Comsol. The data formats are described in the Programming Reference Manual (previously called the COMSOL API Reference Manual). We introduced a new Matlab function in Comsol 5.0 called mphinterpolationfile that can be used to generate these data file from Matlab data. -- Lars Gregersen Comsol Denmark
Jia Liu
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Posted: 8 years ago Jul 22, 2016, 7:19 a.m. EDT
Hi

Thanks a lot!
What you said is a solution for this question. I have written a MATLAB function that is similar to the stair function to assign a parameter to each grid cell only for rectangular element. However, the parameter only be assigned each grid node.

Best wish
Hi Thanks a lot! What you said is a solution for this question. I have written a MATLAB function that is similar to the stair function to assign a parameter to each grid cell only for rectangular element. However, the parameter only be assigned each grid node. Best wish
Wenxue Deng
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Posted: 8 years ago Aug 15, 2016, 8:32 p.m. EDT
This question is similar to get and update each element's material parameter. I have the same problem.
This question is similar to get and update each element's material parameter. I have the same problem.

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