U-bend Mesh in ICEM CFD
 

Hi,

I am modeling a U-bend in ICEM CFD and I am currently obtaining a very bad mesh quality. I used 2D Surface Blocking using MOSTLY MAPPED then transformed it into 3D using MULTIZONE FILL. Then, I created an O-grid on the inlet and outlet faces to obtain an O-ring mesh. I am not really sure what is the best way to mesh this model while maintaining the O-ring mesh on the inlet and outlet.

Thank you

Hi John,

This forum is plenty of information, specialy, with respect to this topic...

There is a sticky thread at the top of ANSYS Meshing & Geometry forum about "Before you start a thread, see if you can find answers here"

From your explanation, I think you are trying to apply an O-grid for your U bend from inlet to outlet. If that is correct, please, take a look at all these links below ;):

C Grid for U bend Pipe

3D Pipe Bend Mesh

Pipe bend meshing using MultiZone

ICEM "U" shaped pipe meshing

Furthermore, you have some good videos on youtube about this topic:

https://www.youtube.com/watch?v=ncV3pxQFp-s

Hope all of these links help you :)

Thank you! I will leave my thread here so that other people can benefit from the links you just posted.

Hi Javi, by any chance, do you happen to have more links regarding this problem? I still can't figure out my solution.

Hi John,

Prabably it 'd be better if you post some pictures of your problem :)

Thank you for your reply Javi.

In picture-1: My model. I created a 3D block, then an O-grid, then deleted the central block.

In picture-2: The steps I am trying to mesh my U-bend. Basically, I am stuck in the final step in the "Top down" approach.

Hi John,

Yes, you have everything ready. So keep going!! Now, you need to associate edge to curves at inlet and outlet (3rd picture in the Top-down approach of your second attached photo; that's why you can see them in green color). Even, I can see some curves (assuming you show just curves) prepared for some splits on your blocks (4th picture in the Top-down approach of your second attached photo; that's why you can see more green color edges). Later, you could use "Split Edge" if you want your block edges get the same shape of your geometry (for example with "Automatic linear" option)!

I see. I am good with associating edges but I am not quite sure how to do the splitting part. I tried to simply split the block and then move the nodes but I obtain a very weird block geometry with then messes up my mesh. Is there an easy way to split the block to make it look like the 4th step in the first picture? I am not sure if that's what you were referring to when you said "Automatic liner option".

Hi John,

It would be easier to explain you how to do it by pictures... But the only thing you need to use is "Split" button... Then you'll get 4 vertices and 4 edges.. which you need to associate to your geometry...

Autmatic linear option you can use it in case you want your block edges to get the same shape of your geometry curves. Hope this helps! But if you still don't know how to do it, I recommend you to practise with ICEM CFD tutorials. It will help you to understand and embrace the different steps about blocking :)

Hi Javi, I posted two pictures (one of my geometry and the other picture is the steps I am following) in comment #6. Yes, I used the split option to cut the block at the U-bend part but I am having trouble fitting the block so that it looks like the last step in the Top-Down approach in Picture 2. However, I will try to use the Automatic Liner option as you suggested!

Thank you.

Hi John,

Ok! But, you should have a look at this video (I think it could help you):

ICEM meshing tutorial on 3D pipe with 45 degree bend

:)