[snappyHexMesh] SnappyHexMesh for adding circle inlet

KyriakosPaso · February 1, 2019, 00:37

Hello.

I have the geometry that is shown in the image below, and I need to add 4 circle inlets at the upper side of the cylinder. I have tried to use topoSet and createPatch utilities, but the result is not satisfying, due to the fact that in this mesh is impossible to create a circle.
I have read in previous threads, that snappyHexMesh utility could be appropriate for my problem, but i don't know how it could help me? What .stl should I use, cylinders?
Does anyone have any idea that could help me?

Thank you in advance!

lebc · February 1, 2019, 18:21

Hi,

You can use SnappyHexMesh to refine the mesh in the region you want to use topoSet.

There are two tutorials that can help you:

https://github.com/OpenFOAM/OpenFOAM...Foam/rotorDisk

https://github.com/OpenFOAM/OpenFOAM.../turbineSiting

In the second one you can use searchableCylinder instead of searchableBox. Give it a try! =)

Best Regards,
Luis

KyriakosPaso · February 2, 2019, 21:59

I'll try it!
Thanks a lot lbec!!

KyriakosPaso · February 4, 2019, 02:09

I have a question. When i define a searchableCylinder in my mesh, and set refineRegions on level 6, shouldn't it be created a cylindrical mesh inside my mesh?
I tried it and i saw no difference in my mesh!

lebc · February 4, 2019, 02:25

What searchableCylinder does is to find the cells inside this region and apply the refinement level you choose, but you may get different results depending on how you define the cylinder.
Try using a big cylinder to see if you have any refinement, maybe you are defining a small or thin cylinder in a very coarse mesh, which can not work depending on the case.

KyriakosPaso · February 4, 2019, 13:39

May you have some time to examine my blockMeshDict and my snappyHexMeshDIct, because I tried it also for big cylinders but I found no progress.

lebc · February 4, 2019, 23:37

Sure, just send me your case folder and I can try here.

February 2, 2019, 21:59		#3
KyriakosPaso New Member Kyriakos Paso Join Date: Nov 2018 Posts: 20 Rep Power: 8	I'll try it! Thanks a lot lbec!! Last edited by KyriakosPaso; February 4, 2019 at 02:09.

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February 1, 2019, 18:21		#2
lebc Member Luis Eduardo Join Date: Jan 2011 Posts: 85 Rep Power: 15	Hi, You can use SnappyHexMesh to refine the mesh in the region you want to use topoSet. There are two tutorials that can help you: https://github.com/OpenFOAM/OpenFOAM...Foam/rotorDisk https://github.com/OpenFOAM/OpenFOAM.../turbineSiting In the second one you can use searchableCylinder instead of searchableBox. Give it a try! =) Best Regards, Luis

February 4, 2019, 02:09		#4
KyriakosPaso New Member Kyriakos Paso Join Date: Nov 2018 Posts: 20 Rep Power: 8	I have a question. When i define a searchableCylinder in my mesh, and set refineRegions on level 6, shouldn't it be created a cylindrical mesh inside my mesh? I tried it and i saw no difference in my mesh!

February 4, 2019, 02:25		#5
lebc Member Luis Eduardo Join Date: Jan 2011 Posts: 85 Rep Power: 15	What searchableCylinder does is to find the cells inside this region and apply the refinement level you choose, but you may get different results depending on how you define the cylinder. Try using a big cylinder to see if you have any refinement, maybe you are defining a small or thin cylinder in a very coarse mesh, which can not work depending on the case.

February 4, 2019, 13:39		#6
KyriakosPaso New Member Kyriakos Paso Join Date: Nov 2018 Posts: 20 Rep Power: 8	May you have some time to examine my blockMeshDict and my snappyHexMeshDIct, because I tried it also for big cylinders but I found no progress.

February 4, 2019, 23:37		#7
lebc Member Luis Eduardo Join Date: Jan 2011 Posts: 85 Rep Power: 15	Sure, just send me your case folder and I can try here.