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Free fluid flow inducing a movement in a porous matrix

Posted Jun 5, 2019, 7:40 p.m. EDT Structural & Acoustics, Fluid & Heat Version 5.3a 2 Replies

JH
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Hi all,

I'm looking to simulate a steady state system where a fluid flow is inducing a velocity on an porous matrix (see attached picture).

I have managed to model a moving solid using the Fluid-Structure Interaction multiphysics, and I have also managed to seperately model a non-moving solid being infiltrated by the fluid using the Free and Porous Media Flow physics. However I am not sure how to start in order to model both of these physics happening at the same time.

I have attached a picture of the problem.

Any help would be greatly appriciated.

Kind regards, J

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2 Replies Last Post Jun 9, 2019, 6:04 p.m. EDT
Alexis Prel
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Posted: 6 years ago Jun 6, 2019, 8:00 a.m. EDT
Updated: 6 years ago Jun 6, 2019, 8:00 a.m. EDT

Hi J,

I recommend you read the Deformed Geometry and Moving Mesh chapter of the reference manual

/path/to/comsol/doc/pdf/COMSOL_Multiphysics/COMSOL_ReferenceManual.pdf

As far as I can tell, your usecase is completely within what this feature is intended for. Best, Alexis

Hi J, I recommend you read the **Deformed Geometry and Moving Mesh** chapter of the reference manual /path/to/comsol/doc/pdf/COMSOL_Multiphysics/COMSOL_ReferenceManual.pdf As far as I can tell, your usecase is completely within what this feature is intended for. Best, Alexis
JH
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Posted: 6 years ago Jun 9, 2019, 6:04 p.m. EDT
Updated: 6 years ago Jun 9, 2019, 6:01 p.m. EDT

Thanks for the reply Alexis!

I am somewhat familiar with using deformed geometries/moving mesh. However in this case I ideally do not want the geometry to deform. I did not explain it well, but in this case the porous matrix is infinitely long, so when it is moved down and exits the domain at the bottom, it is also replaced at the top. So essentially I am not "moving" the shape of my domains.

Maybe this makes the problem more difficult?

Any further help would be greatly appriciated.

Thanks again, J

Thanks for the reply Alexis! I am somewhat familiar with using deformed geometries/moving mesh. However in this case I ideally do not want the geometry to deform. I did not explain it well, but in this case the porous matrix is infinitely long, so when it is moved down and exits the domain at the bottom, it is also replaced at the top. So essentially I am not "moving" the shape of my domains. Maybe this makes the problem more difficult? Any further help would be greatly appriciated. Thanks again, J

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