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Script to add many point loads to geometry?

Posted 31 août 2021, 20:57 UTC−4 Structural & Acoustics, Geomechanics Version 5.5 4 Replies

Tom Parsons
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Hi - I'm new to Comsol, and coming from ANSYS where this problem would be easy. I have a very complex load defined at 10^6 points. Wondering if I can write a script to define points in the geomety and then apply forces at those points. Alternatively I could apply forces at nearest nodes if I knew how to find them. Or, I could spread the point loads into areas and define pressures, but I don't know how to define the areas for those loads either.

I can easily write a program to create a script, but not sure what it should say. Web serches haven't turned up anything. Thanks for any help.

4 Replies Last Post 2 sept. 2021, 21:09 UTC−4
Henrik Sönnerlind COMSOL Employee

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Posted: 3 years ago 1 sept. 2021, 05:39 UTC−4

To add perform a repetitive task, you can use either a Model Method, a Java Script, or (if you have such a license) Matlab scripting.

This said, adding 10^6 nodes to the model tree will make your model essentially impossible to work with. What is the background story for the 10^6 loads? Is it a distributed load that you try model in this way? If so, it is probably better to work with boundary loads and interpolation functions.

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Henrik Sönnerlind
COMSOL
To add perform a repetitive task, you can use either a Model Method, a Java Script, or (if you have such a license) Matlab scripting. This said, adding 10^6 nodes to the model tree will make your model essentially impossible to work with. What is the background story for the 10^6 loads? Is it a distributed load that you try model in this way? If so, it is probably better to work with boundary loads and interpolation functions.
Tom Parsons
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Posted: 3 years ago 2 sept. 2021, 12:13 UTC−4

Thanks Henrik for your reply. They are individual known point loads. Your idea of interpolating the load is interesting. If I input a table with X, Y, Force (directed in Z) values and create an interpolated load, can I apply that to the model surface?

Thanks Henrik for your reply. They are individual known point loads. Your idea of interpolating the load is interesting. If I input a table with X, Y, Force (directed in Z) values and create an interpolated load, can I apply that to the model surface?
Dave Greve
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Posted: 3 years ago 2 sept. 2021, 18:59 UTC−4

The force components associated with a Boundary Load node can be functions of position, so I assume that an interpolation function can also be used there (haven't done this myself however).

Indeed, in Comsol almost any box that takes a numerical input will also accept functions.

The force components associated with a Boundary Load node can be functions of position, so I assume that an interpolation function can also be used there (haven't done this myself however). Indeed, in Comsol almost any box that takes a numerical input will also accept functions.
Tom Parsons
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Posted: 3 years ago 2 sept. 2021, 21:09 UTC−4

Yes that works. One can enter int1(x,y) for a z-direction boundary load. Thanks!

Yes that works. One can enter int1(x,y) for a z-direction boundary load. Thanks!

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