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Measuring volume of matrix material

Posted May 18, 2020, 5:46 a.m. EDT 6 Replies

Alex Stonehouse
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Hello,

I have programmed a unit area of matrix containing a random distribution of fibres (see attached image). I would now like to effectively measure the volume fraction of fibres within the cube, disregarding the fibre ends that exit the cube faces; this would be so that I could at some point input a dersired volume fraction into my code and generate a resulting model. Is there a way to measure the volume of the cube, for example if i were to use the geometry of the fibres to create voids in the matrix?

Any help is appreciated, thanks!

-alex

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6 Replies Last Post May 19, 2020, 6:28 a.m. EDT
Edgar J. Kaiser Certified Consultant
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Posted: 5 years ago May 18, 2020, 6:10 a.m. EDT

Alex,

to measue a domain volume you can set up a domain integration coupling operator, typically it is intop1(). Then you can define a variable, e.g. volume = intop1(1).

Cheers Edgar

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Alex, to measue a domain volume you can set up a domain integration coupling operator, typically it is intop1(). Then you can define a variable, e.g. volume = intop1(1). Cheers Edgar
Alex Stonehouse
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Posted: 5 years ago May 18, 2020, 8:57 a.m. EDT

Thanks Edgar,

I couldn't find intop1() or anything about a 'domain integration coupling operator' in the COMSOL programming reference manual. Is there somewhere i can read more about this?

Thanks, -alex

Thanks Edgar, I couldn't find intop1() or anything about a 'domain integration coupling operator' in the COMSOL programming reference manual. Is there somewhere i can read more about this? Thanks, -alex
Edgar J. Kaiser Certified Consultant
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Posted: 5 years ago May 18, 2020, 9:20 a.m. EDT

This is not about programming. Check in the model builder under Component1 > Definitions > Nonlocal Couplings > Integration

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
This is not about programming. Check in the model builder under Component1 > Definitions > Nonlocal Couplings > Integration
Dave Greve
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Posted: 5 years ago May 18, 2020, 11:20 a.m. EDT

Even easier than that is Volume Integration (of 1) under Derived Values.

By the way- the various uses of the intop operator could be better explained than in the documentation I have been able to find. In particular the significance of the intop operator on a point is...obscure.

Even easier than that is Volume Integration (of 1) under Derived Values. By the way- the various uses of the intop operator could be better explained than in the documentation I have been able to find. In particular the significance of the intop operator on a point is...obscure.
Alex Stonehouse
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Posted: 5 years ago May 19, 2020, 4:42 a.m. EDT
Updated: 5 years ago May 19, 2020, 4:55 a.m. EDT

Thanks

I want to add fibres in a programming loop until a defined volume fraction is reached. Therefore, i dont think intop1() is what i need

Thanks I want to add fibres in a programming loop until a defined volume fraction is reached. Therefore, i dont think intop1() is what i need
Edgar J. Kaiser Certified Consultant
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Posted: 5 years ago May 19, 2020, 6:28 a.m. EDT

You can of course use the coupling operations, as well as the post processing integration, as suggested by Dave Greve in application methods.

-------------------
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
You can of course use the coupling operations, as well as the post processing integration, as suggested by Dave Greve in application methods.

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