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need help on how to properly simulate a moving mesh

Posted 2010年7月13日 GMT+8 13:07 Version 5.2 9 Replies

Jonathan Perez
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hello everyone.
i would like to ask some assistance on how i could do this properly.
i have a model composed of two composite geometries. the fist of the two geometries which is the block represents a fluid (water) and the second the second geometry found inside the block represents a porous media.
what i would to like to simulate here is the swelling of the porous media being submerged in the fluid (water).
every time i run the solve features, i always got an error.
i do not know where and which part i did it improperly.
i am attaching the file for you to see the model.
please, anybody knows how to to properly do this, give me some advise.
thank you so much in advance.

9 Replies Last Post 2016年4月1日 GMT+8 15:31
Danial Tz
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Posted: 2 decades ago 2010年7月13日 GMT+8 20:32
This is an old comsol file. Try uploading a 3.5a or 4.0 version please.
This is an old comsol file. Try uploading a 3.5a or 4.0 version please.
Jonathan Perez
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Posted: 2 decades ago 2010年7月14日 GMT+8 10:34
Danial,

Thank you so much for responding my email. i am attaching a new file in 3.5a version.


Danial, Thank you so much for responding my email. i am attaching a new file in 3.5a version.
Danial Tz
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Posted: 2 decades ago 2010年7月14日 GMT+8 14:36
Jonathan,

Can you please tell more about the problem in detail? The solver started running just ok.
Jonathan, Can you please tell more about the problem in detail? The solver started running just ok.
Jonathan Perez
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Posted: 2 decades ago 2010年7月15日 GMT+8 09:20
Danial,
thank you so much for extending your help.
i am very glad that the model did run properly this time. i just did a several changes and revisited the in inputs of the data.
my apologies for taking your time.
maybe i just committed some errors in inputing the data.
but sooner should problems arise again, i will keep it posted in the forum.
again thank you so much and may God bless you.

jonathan
Danial, thank you so much for extending your help. i am very glad that the model did run properly this time. i just did a several changes and revisited the in inputs of the data. my apologies for taking your time. maybe i just committed some errors in inputing the data. but sooner should problems arise again, i will keep it posted in the forum. again thank you so much and may God bless you. jonathan
Simona Migliozzi
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Posted: 10 years ago 2016年3月30日 GMT+8 23:20
Hi Jonathan,
I'm dealing with a problem similar to that you had, as I can read. May I ask you how you solved the problem of swelling in a porous media with Comsol?
I'd really appreciate your help.
Many Thanks

Simona
Hi Jonathan, I'm dealing with a problem similar to that you had, as I can read. May I ask you how you solved the problem of swelling in a porous media with Comsol? I'd really appreciate your help. Many Thanks Simona
Joel Vienes
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Posted: 10 years ago 2016年3月31日 GMT+8 07:21
Hi Simona,
What I did before was combine two different physics. Heat transfer in solids and Structural Mechanics. The analogy of the Fourier's Law of Heat Transfer and Fick's Diffusion was used for the moisture diffusion in the media that I was studying. Then for the hygroscopic swelling part, I used the structural mechanics module. You can add the thermal expansion node in structural mechanics. Attached is the picture of what I did.
Hope that helps.

Jonathan

Hi Simona, What I did before was combine two different physics. Heat transfer in solids and Structural Mechanics. The analogy of the Fourier's Law of Heat Transfer and Fick's Diffusion was used for the moisture diffusion in the media that I was studying. Then for the hygroscopic swelling part, I used the structural mechanics module. You can add the thermal expansion node in structural mechanics. Attached is the picture of what I did. Hope that helps. Jonathan

Attachments:

Simona Migliozzi
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Posted: 10 years ago 2016年3月31日 GMT+8 16:15
Dear Jonathan,
thanks a lot for your answer!
I'm afraid that my problem is a little bit complicated and I need to implement the model with a moving mesh because I can't use the built-in models for the physics. I found problems in coupling equations written with the mathematics module and the moving mesh to simulate at the same time the swelling behaviour and the physics of my problem.

Can you give me some indications?

Thank you

Simona
Dear Jonathan, thanks a lot for your answer! I'm afraid that my problem is a little bit complicated and I need to implement the model with a moving mesh because I can't use the built-in models for the physics. I found problems in coupling equations written with the mathematics module and the moving mesh to simulate at the same time the swelling behaviour and the physics of my problem. Can you give me some indications? Thank you Simona
Joel Vienes
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Posted: 10 years ago 2016年4月1日 GMT+8 07:39
Hi Simona

I've seen one topic in the forum before about moving mesh. Maybe this can help you.


www.comsol.com/community/forums/general/thread/26292/

Transient 3D Moving Mesh

Try to study the works of Prof. Rebecca Cantrell. She perfectly modelled a moving mesh problem.

Jonathan


Hi Simona I've seen one topic in the forum before about moving mesh. Maybe this can help you. http://www.comsol.com/community/forums/general/thread/26292/ Transient 3D Moving Mesh Try to study the works of Prof. Rebecca Cantrell. She perfectly modelled a moving mesh problem. Jonathan
Simona Migliozzi
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Posted: 10 years ago 2016年4月1日 GMT+8 15:31
Thank you Jonathan.

I've already seen that conversation on the forum, but I'll try to study in more detail the work of Prof. Cantrell.

Simona
Thank you Jonathan. I've already seen that conversation on the forum, but I'll try to study in more detail the work of Prof. Cantrell. Simona

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