I have a complicated 3D geometry with 1033 boundaries in COMSOL Multiphysics. I need the list of max and min of x-coordinate, y-coordinate and z-coordinate of each boundary in a text or excel file.
For example:
Boundary\ minx\miny\ minz\maxx \maxy\maxz
34 1.5 4 -8 3 12 2
56 1 3.5 -6.7 10 9.7 6
...
How can I do it?
I know by right-clicking on geometry node and choosing measure, I can extract some data. But this method isn't practical for some situations like this (1033 boundaries)!
I would be appreciated if anyone helped me possibly.
Well, for one boundary you can for example set a Boundary Probe (under Definitions) and set the probe type to Max or Min. Or you can under Data Set make a Surface, and the under Derived Values select the surface and write the expression max(x), min(z) or whatever. But you probably need to script this if you have many boundaries.
Dear Samin,
you can use a model method for that, basically you can create a selection containing all the boundaries of your model, create a loop over all the boundaries in the selection and perform a max/min evaluation over each surface, the data appended to a list and when the loop ends write the list to a file. You can use the record method option to see the API syntax to complete the algorithm.
Kind regards,
Julian
Thank you so much, J. Anaya
How can I create a loop? I searched and only I found "For and End For" subnode (by right-clicking on "solution node"). But I think it is not what I want.
I would be appreciated if you explained it to me possibly.
Thank you so much, J. Anaya
I do not have the experience of using the COMSOL API. I'll check it, surely.
Just one more question: Is it possible to do it by writing an m.file, too? (LiveLink_for_MATLAB) Because before, it came to my mind to write an m.file, but the problem was that the result of the "measure" command was not recorded anywhere.
Dear Samin,
to store the entities in a given selection in a vector you can use this:
int[] indexContainer = model.component("Your comp name").geom("Your geometry name").selection("Your selection name").entities(model.component("Your comp name").geom("Your geometry name").selection("Your selection name").objects()[0], 3);
In this way you are asking for all the index of the entities of dimension 3 inside "Your selection name". If you want to access surfaces substitute the 3 by a 2, or by a 1 if you want the edges.
Regards,
Julian
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