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[ICEM] Correct blocking and Ogrid in ICEM

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Old   October 29, 2016, 06:26
Default Correct blocking and Ogrid in ICEM
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Hey all,

I am just trying to get into CFD using ICEM and Fluent for a uni project.

I have been fighting with how to correctly do the blocking and therefore the mesh for a while.

I modeled the fluid domain ("negative" of the separator) in solidworks. there is an extrusion into the fluid domain from the bottom since the inlet reaches into the fluid. For better understanding I attached two pictures of what it looks like.

Now when trying to do the blocking in ICEM i first tried to do the blocking for the vertical part, which seems to result in a reasonably good mesh (from what I know), but when i try to add the last part, the brine effluent exiting to the side, the mesh gets pretty crappy.

Approach for the vertical part (separator body, inlet outlet) was the following:
I created a big block around the vertical part of the fluid domain and since i have different 4 diameters (inner diameter inlet, outer diameter inlet, inner diameter outlet and inner diameter separator body) i created 4 ogrids with the edges of the blocks associated to the curves and vertices of the innermost block projected to points that i created (at 0.6 between midpoint and innermost curve).
I then split the blocks vertically on every plane and deleted the ones that are outside my fluid domain. The blocks of the inlet wall that reach into the fluid domain were assigned to a new part (solid).
When i look at the pre-surface-mesh (just used parameter max. size 3) it seems that the quality is okay so far, the only "bad" cells are located where the side effluent for the brine in the bottom part of the separator (which is logical since there is no blocking for that part yet).

Now here i get kind of stuck on how to block the last part. When simply trying to add a new block for the side outlet, and giving it one Ogrid, it makes the cells in that area go very bad...

Anyone have any ideas on how i could solve this?

Now since this might have been a bit confusing, i basically followed the approach of this video:

I attached some pictures of what my geometry and my blocking looks like... missing the blocking for the side outlet.

I am thankful for any hint. If there's any uncertainties, please ask

Thank you!

Attached Images
File Type: png blocking_sidemissing.PNG (27.6 KB, 117 views)
File Type: png curves bottomview.PNG (18.1 KB, 98 views)
File Type: png CAD_fluiddomain.PNG (75.7 KB, 88 views)
File Type: png premesh blocks bottomview.PNG (54.6 KB, 126 views)
File Type: jpg unfinished surface mesh.jpg (64.7 KB, 75 views)
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Old   November 4, 2016, 02:02
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Probably you can create one O grid block and then for face selection, select the extreme faces.

I think that might do the trick.
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Old   November 4, 2016, 07:13
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Hello Salumi,

Your blocking strategy needs to be based on a T-junction type approach. There are several ways to split the blocking, a nice thread on this forum can be found here:

You should add a Ogrid split of both section after the splitting.

Have fun
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Old   November 8, 2016, 10:10
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Dear Gweher,

thanks very much for your answer

I am getting a much better result now, by starting with the t junction approach and adding the ogrids after.
Hope that this mesh will be usable for simulation now.

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blocking, icem, ogrid, pipe junction

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