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combine blockMesh features cyclicGgi and mixingPlane with multiregion snappyHexMesh

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Old   May 18, 2016, 09:30
Default combine blockMesh features cyclicGgi and mixingPlane with multiregion snappyHexMesh
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Amelie Rohlfs
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Dear experts,


Short description of my case:
Flow in rotating axial turbomachinery (somewhen in the future fluid structure interaction), the case is restricted to one passage (inlet, rotorregion, statorregion)

My proceeding so far:

I built the outer geometry (inlet, outlet, hub, shroud, walls) with blockMesh in three blocks, have a look at the attached picture.

I have the blades (one rotor blade, one stator blade) in .stl format and want to insert them in the rotorblock and the statorblock. Up till now I just worked with the rotorblade.

Next step would be meshing with snappyHexMesh. As far as I have understood, sHM cannot handle several blocks, so the faces from inletblock and stator block are deleted after sHM. The second picture shows how it looks now.


From here on I'm not sure how to proceed. I've read in severeal threads that the problem with sHM and the multiple regions can be solved with a stl file for each reagion. So I would export from my CAD program
- inlet_geometry.stl
- rotor_geometry.stl
- stator_geometry.stl
Then I can place my stl blades in the regions.

But:

How can I then implement such features as cyclicGgi and mixingPlane if my geometry ist not build with blockMesh?


I would be very grateful for some guidance!


Greetings, Amelie
Attached Images
File Type: png blockMesh.png (101.8 KB, 12 views)
File Type: png after sHM.png (43.0 KB, 7 views)
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Old   May 18, 2016, 11:16
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Hi,

You can have three different folders/cases representing the three different blocks and mesh them separately.

You can then merge them altogether using mergeMeshes.

I am not sure about GGI, but if applicable, you can assign cyclicAMI (which is supposed to be similar to GGI) to the relevant patches and give it a shot.

Hope this helps.

Cheers,
Antimony
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Old   May 18, 2016, 11:25
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Amelie Rohlfs
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Dear Antimony,


with your hint on mergeMeshes I found the following tutorial:

http://www.cfdsupport.com/Turbomachi...l/node363.html

which I will have a closer look on. This might be what I am looking for.

You seem to be of great use to me in the last few days ;-)


Cheers, Amelie
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Old   May 19, 2016, 08:59
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Hi Amelie,

You are most welcome! I hope the answers have been useful!

Thank you for the link to the tutorial as well! Looks interesting...

Cheers,
Antimony
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Old   May 20, 2016, 08:11
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Amelie Rohlfs
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I will give an update on my results as soon as I make any progress.
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Old   June 8, 2016, 06:36
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Amelie Rohlfs
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Here comes an update


The proceeding Antimony proposed worked just fine for me (after severe fighting with sHM). So this is what I have done:

1. create four folders (inlet, rotor, rotorblade, stator (blade included))
2. meshing with blockMesh and sHM for each folder seperatly
3. mergeMeshes to combine everything in my case folder
4. define my boundaries such as cyclicGgi or mixingPlane with createPatch for the combined mesh


No I can go on to the next problems
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blockmesh, cyclicggi, mixingplane, multiregion, snappyhexmesh

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