[ICEM] Deleting vertices/"crosses" of deleted block lines

zacko · June 19, 2017, 03:03

Hello there,

I have a little question about deleting vertices (the green "crosses") of deleted block lines. I am starting with ICEM and wanted to mesh a standard airfoil. I tried many options to get to know the program better. I deleteted for example a block so that a few lines aren't there anymore. But when i activated the pre mesh, it seems like the lines were still associated to the curves. In the following pictures you can see the blocking and the green "crosses" near the right vertice, which are causing a very surprising mesh at the boundarys.

Is there any option to delete them or do I need to delete everything?

Thank your for your time and tips

Daniel

bluebase · June 19, 2017, 06:31

Hello Daniel,

have a look into the Part VORFN. Here you will found the "boundary blocks" around your structure.
Check wether the surrounding blocks are also split at that edge.
In case they are splitted, i would extend the splits through the whole domain and merge away unwanted layers of blocks.

zacko · June 19, 2017, 06:56

Hello Sebastian,

thanks for your hint. With VORFN open, i could fix all my problems with the edges and blocks.

Thank you very much!

jainanup27 · March 27, 2019, 21:40

Hi!

Can anyone of you tell me how can I get a curved mesh in that quarter circle. I have attached the image of the block lines(image 1) and the mesh (image 2) that I get. I am not able to understand why am I getting the skewed mesh rather a quarter circle curved mesh?

Furthermore, is there any way possible I can get block lines as in part B image 3 rather than part A (i got part A because I created C- grid around the geometry)

Image 4 is the final mesh that I have obtained

shereez234 · March 29, 2019, 07:28

Extend the edge from the curved corner (which is not there right now) and move to the vertex on outer curve to right place to get right orthoganility.

ps: i would create a half o grid for this geometry

jainanup27 · March 29, 2019, 07:34

Quote:

Originally Posted by shereez234

Extend the edge from the curved corner (which is not there right now) and move to the vertex on outer curve to right place to get right orthoganility.

ps: i would create a half o grid for this geometry

I did try that option of adding an edge as you said but the result was same. Still will give try again . Furthermore, Can you elaborate on what do you mean by half o grid?

Far · March 31, 2019, 08:14

First Approach:I made it for half of geometry only, but in downstream it is simple H block which needs to be created, so it is applicable 100% for your case. See first image

Second approach: Here I have created Quarter O-Grid. See second image

jainanup27 · March 31, 2019, 08:46

Thanks for your reply. I am actually new to ICEM CFD. Can you tell me what is quarter/ half o- block or can you post the blocking picture?

Far · March 31, 2019, 10:33

You can get basic idea about ICEM CFD from :

Video 1: https://youtu.be/6NbNUNq0BBY
Video 2: https://www.youtube.com/watch?v=6NbNUNq0BBY
Video 3 : https://youtu.be/I1L2BPy-Eog

Now I am posting the blocking from Method 2. Method 1 has slightly different approach.

Create block and associate all edges and vertices

Create splits

From Ogrid panel, select blocks and edges as shown in Fig.

Apply to create quarter Ogrid

see next post for further steps...

Far · March 31, 2019, 10:46

Make another split, move vertices to adjust vertices and make association for inside body.

Delete blocks from inside. You must choose delete permanently option while deleting blocks.

Set premesh edge parameters and display premesh

jainanup27 · March 31, 2019, 11:14

Thanks for such a detailed and immediate reply. Genuinely appreciate that!!!

jainanup27 · March 31, 2019, 11:18

Quote:

Originally Posted by Far

Make another split, move vertices to adjust vertices and make association for inside body.

Delete blocks from inside. You must choose delete permanently option while deleting blocks.

Set premesh edge parameters and display premesh

Thanks @Far for such a detailed and immediate reply. Genuinely appreciate that!!!

Far · March 31, 2019, 14:44

The blocking you had posted in your post should also work by adding one extra split and moving vertices to optimal location. I am posting two images (image 1 for blocking, image 2 = pre mesh from that blocking).

jainanup27 · March 31, 2019, 14:55

With your technique I could get this! I will try my blocking and adding a edge as you said

Far · March 31, 2019, 15:08

Thats great.

You can also try this blocking approach and this will give you amazing mesh quality.

jainanup27 · March 31, 2019, 15:09

Quote:

Originally Posted by Far

Thats great.

You can also try this blocking approach and this will give you amazing mesh quality.

Sure I will try that too. But yeah all thanks to you!

Far · March 31, 2019, 15:25

Here you go

June 19, 2017, 06:31		#2
bluebase Senior Member Sebastian Engel Join Date: Jun 2011 Location: Germany Posts: 566 Rep Power: 20	Hello Daniel, have a look into the Part VORFN. Here you will found the "boundary blocks" around your structure. Check wether the surrounding blocks are also split at that edge. In case they are splitted, i would extend the splits through the whole domain and merge away unwanted layers of blocks. zacko and lukasf like this.

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June 19, 2017, 06:56		#3
zacko Senior Member Daniel Join Date: Feb 2017 Location: Germany Posts: 147 Rep Power: 9	Hello Sebastian, thanks for your hint. With VORFN open, i could fix all my problems with the edges and blocks. Thank you very much!

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March 31, 2019, 08:46		#8
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March 31, 2019, 11:14		#11
jainanup27 New Member Anup Jain Join Date: Mar 2019 Location: New Hampshire Posts: 23 Rep Power: 7	Thanks for such a detailed and immediate reply. Genuinely appreciate that!!!