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June 28, 2013, 17:59 |
moving wall
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#1 |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Hi
I am wondering if there is a method to move the boundary at a specified speed and change the mesh automatically in openFoam. I mean the most side wall move, not a solid body in liquid. In that case, the whole simulation domain would change, not partial domain.(something like piston moving in the vessel). I know a solver named icoDymFoam could address body moving in liquid issues, but I don't know if it could be used to simulate the situation I described above. if so, how to. If not, if there exists any other methods to fullfill it. Thank you. |
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July 5, 2013, 04:28 |
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#2 |
Member
Nicklas Linder
Join Date: Jul 2012
Location: Germany
Posts: 35
Rep Power: 13 |
Hi,
do you know this tutorial? Code:
OpenFOAM-2.2.x/tutorials/incompressible/pimpleDyMFoam/movingCone Greetings Nicklas |
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July 5, 2013, 06:36 |
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#3 |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Yes, I know this,but this is a solide body in the liquid. Not what I want. I need, for example, the inlet boundary moving.
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July 5, 2013, 07:14 |
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#4 |
Member
Nicklas Linder
Join Date: Jul 2012
Location: Germany
Posts: 35
Rep Power: 13 |
Yes, but don't you just need to apply the pointMotionU to whatever boundary you want?
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July 5, 2013, 08:30 |
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#5 | |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Quote:
Thanks. |
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July 5, 2013, 08:46 |
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#6 |
Member
Nicklas Linder
Join Date: Jul 2012
Location: Germany
Posts: 35
Rep Power: 13 |
I use this procedure to move a boundary. Basically I compress the fluid between two plates. My moving boundary is a solid, but not embedded in fluid. I just thought that it would work the same way for any other boundary. I don't know what boundaries you set therefore I cannot say if it will work for your case. Also if you say the results are not correct it's difficult to help.. You need to be more precise..
Greetings |
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July 5, 2013, 12:16 |
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#7 | |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Quote:
In addition, I am wondering how to specified the motion of the boundary and is there a way to address boundary wall motion with layer addition and removal way? Thanks. |
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July 9, 2013, 10:49 |
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#8 |
Member
Nicklas Linder
Join Date: Jul 2012
Location: Germany
Posts: 35
Rep Power: 13 |
Hi cctv,
I had a look at your case, but I do not understand what you try to do. It is a 2D case. We have 3 boundaries: - movingWall - fixedWall - farField But if I got you right from your previous posts, you don't want to move a wall, correct? So maybe you can give me a hint what each boundary is plant to do? Thanks Nicklas |
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July 10, 2013, 04:15 |
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#9 | |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Quote:
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July 10, 2013, 04:36 |
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#10 |
Member
Nicklas Linder
Join Date: Jul 2012
Location: Germany
Posts: 35
Rep Power: 13 |
First problem was a typo in the constant/dynamicMeshDict file
Code:
"libfvMotionSolvers.so" Greetings Nicklas |
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July 10, 2013, 05:26 |
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#11 | |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Quote:
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July 10, 2013, 06:54 |
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#12 |
Member
Nicklas Linder
Join Date: Jul 2012
Location: Germany
Posts: 35
Rep Power: 13 |
Would have been easier if you told that before...
This is what I got as a "result": https://dl.dropboxusercontent.com/u/587565/ani.gif (2.2.x) About layer addition or removal I don't know much. I only used dynamicMeshRefinenemt for adding or removing cells. I don't know if the combination works as well.. Have fun |
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July 10, 2013, 13:24 |
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#13 | |
Member
Yu CAO
Join Date: May 2013
Posts: 76
Rep Power: 12 |
Quote:
Good luck |
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July 10, 2013, 15:11 |
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#14 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 |
This may be of to interest to you:
http://www.cfd-online.com/Forums/ope...n-removal.html You may have an easier time making things work as you are using 1.6-ext (I assume from previous posts). There may be a movingConeTopo mesh class; if not you will need to make your own. |
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May 4, 2021, 17:47 |
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#15 |
Senior Member
Join Date: Jul 2019
Posts: 148
Rep Power: 6 |
Hello, I want to study the effect of moving a solid wall out of a 2D fluid domain. My solver does not have the dynamic meshing library. What could be a work around for the above?
Thanks |
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July 21, 2021, 11:23 |
FSI deforming walls
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#16 | |
New Member
Vishara
Join Date: Feb 2021
Location: Sri Lanka
Posts: 3
Rep Power: 5 |
Quote:
I am trying for months to model something similar to what you have done “ compress the fluid between two plates"(FSI). My case is for cold metal forming and I need to analyse lubrication flow (film thickness analysis) between a die and a deformable (Plastic deformation) wall/body. So I need to simulate with topological changes of deforming solid and fluid domains. I have adapted solids4Foam tutorial case upsetBillet (elastoplasticity) for solid domains which is exactly what I need. To integrate with fluid I followed tutorial case 3dTube case setup, but I am not sure yet what boundary types/conditions I should apply for fluid domain. Could you kindly advise me to setup this case? In order to setup moving boundaries I tried totalPressure BC for the deforming walls but yet not able to model deformable walls. I have attached my geometry of the model and boundary conditions I have used. Please advise.. Thank you, |
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