[ICEM] Block refinement, single-edge elements

FLA31 · April 13, 2017, 14:00

Hello everyone,

i am trying to mesh a Pipe (laval-nozzle) with a structured mesh using Ansys ICEM. I blocked the pipe with an o-grid. I want to refine a part of the nozzle using the block refinement tool in the Pre-Mesh-Parameters. The resulting mesh looks fine. When I check the mesh to find errors and possible problems i get single-edge elements exactly between the refined blocks.

Is there a way to eliminate these elements. Thank you very much in advance!

Here's a picture of the nozzle at the place where i refined the mesh.

shereez234 · April 14, 2017, 10:01

this wouldnt affect your results. ignore

FLA31 · April 19, 2017, 03:10

Thank you for your answer.

Due to the signle-edge-elements, the mesh isn't correctly imported into my solver (Star-CCM+).
After importing it looks like i get two different meshes.

shereez234 · April 19, 2017, 13:18

Quote:

Originally Posted by FLA31

Thank you for your answer.

Due to the signle-edge-elements, the mesh isn't correctly imported into my solver (Star-CCM+).
After importing it looks like i get two different meshes.

star CCM eh? never used it. Okay when you get error message click delete

shereez234 · April 19, 2017, 13:23

is it a connection there between two curves or surfaces?

FLA31 · April 21, 2017, 07:07

No there is no connection between any curves or surfaces. Somehow the cells between the normal blocks and the refined blocks disappear.

If i mesh it without the block-refinement, no single edge elements are created and there is no problem when i import the mesh to star-ccm+

shereez234 · April 21, 2017, 10:13

Hmm I see what you are doing. When you refine like that a cubiod or cube gets divided into the factor of refinement. For example if a region of blocking had 16 cells and your refinment is 2 then they will change to 32 cells. but what about the edges in the next block? they dont match any more do they.

Why dont you use mesh edge parameters and increase the nodes manually or why dont you scale the mesh globally i dont know multiply it by like 1.2? rather than refine a single block

FLA31 · April 24, 2017, 02:54

Using a block refinement the total amount of cells would be lesser, as if i refined the mesh by setting the mesh edge parameters. But as the first option doesn't work, i think i will try to refine the mesh as you proposed.

Thank you again for your help

April 13, 2017, 14:00	Block refinement, single-edge elements	#1
FLA31 New Member Join Date: Dec 2016 Posts: 4 Rep Power: 9	Hello everyone, i am trying to mesh a Pipe (laval-nozzle) with a structured mesh using Ansys ICEM. I blocked the pipe with an o-grid. I want to refine a part of the nozzle using the block refinement tool in the Pre-Mesh-Parameters. The resulting mesh looks fine. When I check the mesh to find errors and possible problems i get single-edge elements exactly between the refined blocks. Is there a way to eliminate these elements. Thank you very much in advance! Here's a picture of the nozzle at the place where i refined the mesh.

April 14, 2017, 10:01		#2
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 352 Blog Entries: 1 Rep Power: 13	this wouldnt affect your results. ignore FLA31 likes this.

April 19, 2017, 03:10		#3
FLA31 New Member Join Date: Dec 2016 Posts: 4 Rep Power: 9	Thank you for your answer. Due to the signle-edge-elements, the mesh isn't correctly imported into my solver (Star-CCM+). After importing it looks like i get two different meshes. saihasil likes this.

April 19, 2017, 13:23		#5
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 352 Blog Entries: 1 Rep Power: 13	is it a connection there between two curves or surfaces? FLA31 likes this.

April 21, 2017, 10:13		#7
shereez234 Senior Member M Sereez Join Date: Jan 2014 Location: England Posts: 352 Blog Entries: 1 Rep Power: 13	Hmm I see what you are doing. When you refine like that a cubiod or cube gets divided into the factor of refinement. For example if a region of blocking had 16 cells and your refinment is 2 then they will change to 32 cells. but what about the edges in the next block? they dont match any more do they. Why dont you use mesh edge parameters and increase the nodes manually or why dont you scale the mesh globally i dont know multiply it by like 1.2? rather than refine a single block FLA31 and aero_head like this.

April 21, 2017, 07:07		#6
FLA31 New Member Join Date: Dec 2016 Posts: 4 Rep Power: 9	No there is no connection between any curves or surfaces. Somehow the cells between the normal blocks and the refined blocks disappear. If i mesh it without the block-refinement, no single edge elements are created and there is no problem when i import the mesh to star-ccm+

April 24, 2017, 02:54		#8
FLA31 New Member Join Date: Dec 2016 Posts: 4 Rep Power: 9	Using a block refinement the total amount of cells would be lesser, as if i refined the mesh by setting the mesh edge parameters. But as the first option doesn't work, i think i will try to refine the mesh as you proposed. Thank you again for your help

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