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[Technical] overset meshing in openfoam (hard)

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Old   August 5, 2021, 05:24
Question overset meshing in openfoam (hard)
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Hi,foamers!

I am using overPimpleDyMFoam to simulate valve shut and I found a pretty hard problem.

First I replaced cylinder case's mid cylinder with my own blockmesh,the result appeared the same with original case.
pic1

And I made it bigger to the up and down wall it's still runs smoothly,
pic2

But when I change the background mesh to a lean one
pic3

the speed gets extremly huge and blow up
pic4

And I shrink the mid cylinder it's goes well.
pic5

So maybe there is a problem deep in the xxxxxx.C or xxxxxxx.H or just myself missetting something in the case?
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Old   August 5, 2021, 05:41
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5 pics following below
Attached Images
File Type: jpg pic1.jpg (30.6 KB, 24 views)
File Type: png pic2.png (63.2 KB, 26 views)
File Type: png pic3.png (57.7 KB, 20 views)
File Type: png pic4.png (31.4 KB, 20 views)
File Type: png pic5.png (92.9 KB, 20 views)
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Old   August 5, 2021, 11:47
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Any answer would be appreciated
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Old   August 8, 2021, 08:57
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Hi,
That would be useful of you can share a picture of your mesh.
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Old   August 8, 2021, 09:55
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Quote:
Originally Posted by Fouch View Post
Hi,
That would be useful of you can share a picture of your mesh.

Hi Fouch,pic6&7 are meshes that diverged,pic8 runs fine.
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File Type: jpg pic6.jpg (167.5 KB, 18 views)
File Type: jpg pic7.jpg (177.3 KB, 13 views)
File Type: jpg pic8.jpg (183.9 KB, 16 views)
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Old   August 8, 2021, 16:45
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Something is not clear to me. If I well understood, you simulate a flow around a hole. So why do you have cells inside the hole ?
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Old   August 9, 2021, 03:25
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Hi Fouch,after mergeMesh it's act just like this.You can run case overPimpleDyMFoam for more information.
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