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Importing point measurements (coordinates in xyz format) into COMSOL 5.0

Posted 13 feb 2015, 10:41 GMT-5 Fluid & Heat, Results & Visualization Version 5.0 5 Replies

Jeroen Tummers
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Hi all,

I am wondering if it is possible to import point measurements into COMSOL. I have a whole range of flow velocity and depth measurements for a river structure. I have already created the 3d geometry drawing in COMSOL, and would like to import my .txt file with these two measurements per point (only one velocity and one depth measurement per point-location, no repeats, a total of 150 point-locations for this structure), so that I can create a colored visualization of flow velocity and depth profile of this structure.
How exactly should the .txt file be ordered? First column with x coordinates, then y, then z, then measurements?
Can I then import it into COMSOL 5.0 via functions - interpolation? How will post-processing for this work exactly?
I only recently started using COMSOL, and any help would be greatly appreciated.

Thank you,
Jeroen
5 Replies Last Post 24 feb 2015, 07:32 GMT-5
Jeroen Tummers
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Posted: 10 years ago 16 feb 2015, 03:38 GMT-5
Anyone who can help me with this query?

Thank you.
Anyone who can help me with this query? Thank you.
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 10 years ago 24 feb 2015, 02:18 GMT-5
Hi

Certainly you might import data, using the "Definition - Functions - Interpolation" node, check the help for the format. You need to load multiple parameter via a file

I'm sure I remember that this has been discussed before on the Forum too

--
Good luck
Ivar
Hi Certainly you might import data, using the "Definition - Functions - Interpolation" node, check the help for the format. You need to load multiple parameter via a file I'm sure I remember that this has been discussed before on the Forum too -- Good luck Ivar
Sepideh Ramezani
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Posted: 10 years ago 24 feb 2015, 04:49 GMT-5
yes, you should define it as an interpolation function with x,y,z,myfun

it is possible to plot your txt file data after importing it to comsol.
yes, you should define it as an interpolation function with x,y,z,myfun it is possible to plot your txt file data after importing it to comsol.
Jeroen Tummers
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Posted: 10 years ago 24 feb 2015, 05:04 GMT-5
Thank you.

I have now imported the .txt file into Comsol, and have made a plot from it. But how do I combine my plot with my 3d geometry drawing. I tried exporting both my 2d and my 3d plot, but that did not work.

So is there a way to overlay my plot (2d or 3d) onto my 3d geometry drawing, so that both show up in same graphics window?

Thank you.
Thank you. I have now imported the .txt file into Comsol, and have made a plot from it. But how do I combine my plot with my 3d geometry drawing. I tried exporting both my 2d and my 3d plot, but that did not work. So is there a way to overlay my plot (2d or 3d) onto my 3d geometry drawing, so that both show up in same graphics window? Thank you.
Sepideh Ramezani
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Posted: 10 years ago 24 feb 2015, 07:32 GMT-5
ok, if I understand correctly, you have two txt files: 1) velocity field and the other one is depth of some points for your river.

Ok, my suggestion is that you can define your depth txt file inside your geometry: first define it as an interpolation curve (which contains x,y,z).
Then define your velocity field txt file as an interpolation function and in post-processing plot them together.

Hope this helps.
Sepideh
ok, if I understand correctly, you have two txt files: 1) velocity field and the other one is depth of some points for your river. Ok, my suggestion is that you can define your depth txt file inside your geometry: first define it as an interpolation curve (which contains x,y,z). Then define your velocity field txt file as an interpolation function and in post-processing plot them together. Hope this helps. Sepideh

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