[Technical] overset meshing in openfoam (hard)

OREOMax · August 5, 2021, 04:24

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?

OREOMax · August 5, 2021, 04:41

5 pics following below

OREOMax · August 5, 2021, 10:47

Any answer would be appreciated

Fouch · August 8, 2021, 07:57

Hi,
That would be useful of you can share a picture of your mesh.

OREOMax · August 8, 2021, 08:55

Quote:

Originally Posted by Fouch

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.

Fouch · August 8, 2021, 15:45

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 ?

OREOMax · August 9, 2021, 02:25

Hi Fouch,after mergeMesh it's act just like this.You can run case overPimpleDyMFoam for more information.

August 5, 2021, 04:24	overset meshing in openfoam (hard)	#1
OREOMax New Member Join Date: Nov 2020 Posts: 12 Rep Power: 5	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? __________________ My email adress is 825543420@qq.com or gwf-1000rd@outlook.com

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August 5, 2021, 10:47		#3
OREOMax New Member Join Date: Nov 2020 Posts: 12 Rep Power: 5	Any answer would be appreciated

August 8, 2021, 07:57		#4
Fouch Member Join Date: Feb 2020 Posts: 79 Rep Power: 6	Hi, That would be useful of you can share a picture of your mesh.

August 8, 2021, 15:45		#6
Fouch Member Join Date: Feb 2020 Posts: 79 Rep Power: 6	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 ?

August 9, 2021, 02:25		#7
OREOMax New Member Join Date: Nov 2020 Posts: 12 Rep Power: 5	Hi Fouch,after mergeMesh it's act just like this.You can run case overPimpleDyMFoam for more information.