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Dynamic Mesh for a Gear Pump

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Old   June 27, 2012, 07:45
Post Dynamic Mesh for a Gear Pump
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TRT
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Hi all. My name is Alejandro Roger Ull. This spring I've been working on my final project for my aerospace engineering degree. I did a study on how to work with dynamic meshes in OpenFOAM, in particular for its application to a gear pump simulation. I want to share my work with you, so that anyone that may find it helpful can access to it.

Gear Pump Animation

The work consists on meshing the geometry with snappyHexMesh in parallel and extruding it with extrudeMesh to make it two-dimensional. Then a custom boundary condition for the movement of the mesh is created. Finally the simulation is run in parallel, by generating an initial mesh, moving it as much as possible, up to acceptable limits of deformation, and finally replacing it with a new mesh. Everything is completely automated.

You can download the document here. (2.63 MB) (CC BY-NC-SA 3.0)
Also, all the files I used can be downloaded here. (9.12 MB) (CC BY-NC-SA 3.0)

If you have any comments feel free to post them here.
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Last edited by wyldckat; May 12, 2014 at 15:41. Reason: fixed link to PDF on request from post #21
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Old   July 3, 2012, 05:26
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Hi TRT,
You did a good job and thanks for sharing. I am about to do a moving mesh simulation in ANSYS Workbench and I am new to it. So i am trying to gather some info. The gear pump u described is similar to what i am looking at, even though the principles are a bit different. I wanted to know whether you did a similar mesh in ANSYS Meshing?

Thanks!
Jimmy
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Old   July 3, 2012, 05:44
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Nice job, thank you for sharing!
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Old   July 6, 2012, 14:27
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Hey Jimmy, unfortunately I do not have a clue about how to do this with ANSYS Workbench, so I can't help you. Thanks for your interest anyways.
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Old   July 30, 2012, 08:58
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Hi Jimmy, you may want to look at http://www.adina.com/newsgH107.shtml for a FSI gear pump analysis
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Old   August 1, 2012, 10:25
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So can ADINA simulate the inner flow of gear pump in 3D?
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Old   August 1, 2012, 10:43
Default Gear Pump analysis
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Hi shanxuewenjdx, Yes it can. The other examples on the webpage are 3D eg the flow meter. Exactly the same capabilities are used.
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Old   December 27, 2012, 13:38
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hello Alejandro
could yu please send me the complete pdf?
thanks.
force.of.love@gmail.com
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Old   December 27, 2012, 13:44
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There is a download button on my first post, and then another one on the dropbox webpage (top right).
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Old   January 24, 2013, 22:45
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I am very happy to see your share, cause I'm going to do an analysis just like that, but I'm in China, there are some reasons to block me from downloading those files by clicking the URL you give, would you please send me the PDF and case files in a zip?

My email: jianli.bjfu@163.com

Thank you!
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Old   July 13, 2013, 14:29
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hi,
can you send your results to me?
I need it immediately for my final project.
kind regards,
behnam Akhoondian
b.akhoondian@gmail.com

Last edited by 88481101; July 13, 2013 at 14:30. Reason: email
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Old   July 27, 2013, 14:51
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hi sparkbjfu,
did U finished your project? if U completed it,can you tell me how you changed the trt's geometry to your own geometry?
best regards,
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Old   August 16, 2013, 12:36
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Nice work!
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Old   September 5, 2013, 18:21
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Thank you for sharing!
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Old   September 5, 2013, 20:28
Default Gear pump and moving mesh tutorial with custom BC
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Excellent tutorial, you even go through the stumbling blocks in the process. Thank you very much for sharing
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Old   September 18, 2013, 05:49
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Quote:
Originally Posted by TRT View Post
Hi all. My name is Alejandro Roger Ull. This spring I've been working on my final project for my aerospace engineering degree. I did a study on how to work with dynamic meshes in OpenFOAM, in particular for its application to a gear pump simulation. I want to share my work with you, so that anyone that may find it helpful can access to it.

Gear Pump Animation

The work consists on meshing the geometry with snappyHexMesh in parallel and extruding it with extrudeMesh to make it two-dimensional. Then a custom boundary condition for the movement of the mesh is created. Finally the simulation is run in parallel, by generating an initial mesh, moving it as much as possible, up to acceptable limits of deformation, and finally replacing it with a new mesh. Everything is completely automated.

You can download the document here. (2.63 MB) (CC BY-NC-SA 3.0)
Also, all the files I used can be downloaded here. (9.12 MB) (CC BY-NC-SA 3.0)

If you have any comments feel free to post them here.
Hi Alejandro Roger Ull,

I was curious if the same problem can be solved using immersed boundary method in openFoam?
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Old   September 19, 2013, 12:53
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Thank you for sharing.
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Old   September 22, 2013, 10:36
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Quote:
Originally Posted by inf.vish View Post
Hi Alejandro Roger Ull,

I was curious if the same problem can be solved using immersed boundary method in openFoam?
I know little about the immersed boundary method (I've only read about it because of your post), but, as far as I know, I don't think it will work. It seems to me that the immersed boundary method is useful when your boundary moves because of the flow, in response to fluid forces (correct me if I'm wrong). But in this case the movement of the gears is known.

Also, take into account that the movement involved in the gear pump is so extreme that probably re-meshing is always needed at some point. You can try to separate the zone with large movements from other steady zones and then stick them together, so that you only have to re-mesh a smaller volume, in order to use less computational power.

Thank you all for your interest in my work.

Alejandro
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Old   September 23, 2013, 06:45
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Quote:
Originally Posted by TRT View Post
I know little about the immersed boundary method (I've only read about it because of your post), but, as far as I know, I don't think it will work. It seems to me that the immersed boundary method is useful when your boundary moves because of the flow, in response to fluid forces (correct me if I'm wrong). But in this case the movement of the gears is known.

Also, take into account that the movement involved in the gear pump is so extreme that probably re-meshing is always needed at some point. You can try to separate the zone with large movements from other steady zones and then stick them together, so that you only have to re-mesh a smaller volume, in order to use less computational power.

Thank you all for your interest in my work.

Alejandro
Hi,

I was curious because Ansys CFX uses the immersed boundary method to solve for flows around a lobe compressor which is basically same as a gear pump.

Anyway, that project is scrapped now since OpenFOAM doesn't support immersed boundary methods.
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Old   October 4, 2013, 08:25
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Hi TRT,

do you think that this will work for complex 3D simulations too? Its kind a hard work for such a job. I am interested in simulation of screw blower...


http://www.industriezeitschrift.de/g...er_element.jpg
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