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FJSJ April 15, 2013 03:16

Merge Mesh

I would like to know if "merge mesh" works with hex/hex mesh or at least one of this must be tetra/tri mesh?

Far April 15, 2013 03:53

one of them must be tri. Hexa- hexa should work well if you have one to one interface I guess.

BrolY April 15, 2013 04:01

If you want to merge Hex mesh with another Hex mesh, you need a conformal interface between the 2 meshes (i.e. the exact same interface with the exact same node repartition), and then use the "merge nodes" option rather than "merge meshes".

FJSJ April 15, 2013 06:55

2 Attachment(s)
Ive tried to do something similar. I have my entire domain split into 3 parts. First, Ive done the first blocking and first mesh. Ive saved blocking and mesh. Second, Ive done the second blocking (merging blocks) and the second mesh and I get this. So..I think something wrong because the second mesh is (only a part) like the color of first one. Do you know why is it?

diamondx April 15, 2013 11:27

FJSJ, sorry I'm not sure i understood what you said. please can you re-formulate.

FJSJ April 15, 2013 12:51

Sure. I have the entire domain divided into 3 parts. First, I do the blocking and mesh in first part. I save the blocking and mesh then close the block and mesh. Then I do the same with the second part of the domain.
But as you can see, in the first part in "Interface 1", no problem. But, on the second mesh, "Interface 1" is a sector only. The rest is associated to another part, instead of associating the "Interface 1" (as in the mesh 1)... Im not sure if I explain well.
Ive tried to follow similar approach like "Merged Tetra-Hexa Mesh in a Hybrid Tube" tutorial. Maybe the problem is the curves association...

diamondx April 15, 2013 13:30

i have more questions: What do you mean by sector only ?
Why did you separate the block in three part ?
Did you try merge blocks ?
Can you share your project using the public dropbox file ?

FJSJ April 15, 2013 14:02

I separated the blocks because is easier to do the block on transition part of my blade. For this reason Ive not tryed merge blocks. Ive tryed to do something similar to BrolY told me. Yes, Im going to share the project but right now dropbox isnt work well.

FJSJ April 15, 2013 14:06

at first, you can view the premesh in part 1. Then, you can open the block "bloque 2" and merge it.
Then view the premesh in this second block.

diamondx April 15, 2013 14:17

Are you aware that you have overlapped surfaces... for one block it may be part of interface_1 and for the other one it may be part of FLOW_DOMAIN_TRANSITION

you can fix that, by doing a doing a build topology in the repair geometry...

diamondx April 15, 2013 14:59

take a look at my blocking without splits:

Project file is here:

FJSJ April 15, 2013 15:50

Thank Diamondx, youre right. I have overlapped surface. Ive delete them and now I think its ok.

Understood. It is better not split. I guess you get with 2 O-grid through the ends and then with a horizontally split? It is?

diamondx April 15, 2013 22:27

ok; i could make another blocking similar to the one in youtube (by simon). minimum quality is 0.4, it can be improved more

link for the project is here:

Far April 16, 2013 02:31

How you will manage sharp trailing edge and circular pipe beneath blade

FJSJ April 16, 2013 02:51

That is the problem area. Because for a cylindric section O-grid is the best. However, for the other part of the blade not .. so ... how to make a block support the other... I mean how to pass from one topology to other one

Far April 16, 2013 03:04

Solution would be to give a finite thickness to trailing edge, if it does not cause in- accuracy...

FJSJ April 16, 2013 03:12

But I need a sharp trailing edge so... I think here is the problem

But... I think Diamondx managed it!

Far April 16, 2013 03:15

Yes. Strategy by diamondx is good.

FJSJ April 16, 2013 04:17

Thank you dimaondx!
You get a good quality in all blade. But why do you create top and down part?
I supposed that is because this part is hard to adjust but im not sure...
Thanks again!

Far April 16, 2013 04:25

can you share bigger picture of your project. I mean blade with hub and farfield volume...

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