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[ICEM] ICEM hexa bunching question: number of nodes and pre-mesh display |
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April 5, 2021, 04:55 |
ICEM hexa bunching question: number of nodes and pre-mesh display
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#1 |
New Member
zuheyr alsalihi
Join Date: May 2018
Location: Belgium
Posts: 18
Rep Power: 8 |
Happy Easter!
Please do forgive my silly question but I am baffled: newcomer to ICEMCFD, in a simple 2D mesh with Hexa, I give 3 nodes along an edge in the bunching, and the pre-mesh plot shows me 11 grid points along that edge. Please tell me what is happening? I checked the manual: Nodesspecifies the number of nodes along the edge. The number may be modified using the up and down arrows or by entering a number in the field. I give 3 nodes, pre-mesh plots 11? Thanks for reading! Kind regards and best wishes! |
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April 6, 2021, 09:20 |
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#2 |
Senior Member
Kira
Join Date: Nov 2020
Location: Canada
Posts: 435
Rep Power: 8 |
Hello,
Could you please attach a photo of the line with 11 nodes, and a picture of the GUI where you specify the number of nodes and the mesh law? |
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April 6, 2021, 10:12 |
Photos of the bunching and pre_mesh
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#3 |
New Member
zuheyr alsalihi
Join Date: May 2018
Location: Belgium
Posts: 18
Rep Power: 8 |
Thank you *so much*
I attach screenshots which I hope are visible. I can send pictures by other means as well if not clear. I also tried hyperbolic etc, the same. The pre_mesh picture is from What is so critical to me is what pre_mesh is plotting really? So important to understand this. Thank you so much! Best, Zuheyr Last edited by zuheyr; April 6, 2021 at 10:17. Reason: Attached uniform and hyperbolic bunching edge informations |
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April 6, 2021, 15:22 |
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#4 |
Senior Member
Sebastian Engel
Join Date: Jun 2011
Location: Germany
Posts: 567
Rep Power: 21 |
Hi Zuheyr,
it is likely, that you blocks have a refinement level which is not 1. In the meshing parameters menu (3rd from the left) you show in your screenshots there is a button to show and modify the refinement levels of blocks(5th from the left). You likely need to set the refinement back to 1 for the respective blocks. Best, Sebastian |
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April 6, 2021, 15:49 |
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#5 |
New Member
zuheyr alsalihi
Join Date: May 2018
Location: Belgium
Posts: 18
Rep Power: 8 |
Sebastian you were right! It was 0.5!!
In fact this brings about a very important concern of mine: I need to make a 3 times refinable mesh for refinement study. it is a 2D mesh. What is the best way of achieving this? There is also a possibility to set a fixed multigrid level, such as 3. I am grateful to you! Thank you. Best wishes, Zuheyr |
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April 6, 2021, 16:08 |
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#6 | ||
Senior Member
Sebastian Engel
Join Date: Jun 2011
Location: Germany
Posts: 567
Rep Power: 21 |
I think, I don't fully understand what you mean.
Quote:
Quote:
Consider refinement levels as a post processing step of the edge parameters---they only have a one-way dependency to the edge parameters. |
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April 6, 2021, 16:16 |
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#7 |
New Member
zuheyr alsalihi
Join Date: May 2018
Location: Belgium
Posts: 18
Rep Power: 8 |
That is a perfect clear explanation. Thank you very much. Best wishes, Zuheyr
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April 12, 2021, 04:03 |
Coarsening is also possible?
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#8 | |
New Member
zuheyr alsalihi
Join Date: May 2018
Location: Belgium
Posts: 18
Rep Power: 8 |
Quote:
I ran into a problem that perhaps you can please help: Can I use the bloack refinement you mention in the meshing parameters menu, the 5th icon, by using a refinement level less than 1? Strangely when I was mistakenly using 0.9, as you have caught, it was working, when I make a good mesh and want to *coarsen* it, I get a cryptic error message saying the factor must be positive! Can I do coarsening? Thank you so much for reading! Zuheyr |
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April 12, 2021, 15:39 |
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#9 | |
Senior Member
Kira
Join Date: Nov 2020
Location: Canada
Posts: 435
Rep Power: 8 |
Quote:
I have had this problem before and found a way to solve it. You need to input a fraction (i.e. 1/2) rather than a decimal (i.e. 0.5). |
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April 14, 2021, 08:13 |
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#10 |
New Member
zuheyr alsalihi
Join Date: May 2018
Location: Belgium
Posts: 18
Rep Power: 8 |
Dear Kira,
Thank you, you once again saved me. Although much to my surprise I unhappily discovered in these forums that refinement is creating hanging nodes whatever they may be, which Fluent ignores but i am using a normal solver and it does not. This will be another thread I will ask for help. I just mention it here for the unawares like me. Kindest regards, Zuheyr |
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April 14, 2021, 09:55 |
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#11 |
Senior Member
Sebastian Engel
Join Date: Jun 2011
Location: Germany
Posts: 567
Rep Power: 21 |
Hi Zuheyr,
Kira knows your struggle for sure. =) Maybe this thread is interesting to you, too: Different Levels of Refinement in Adjacent Blocks Best, Sebastian Last edited by bluebase; April 14, 2021 at 10:09. Reason: wrong link |
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April 14, 2021, 10:53 |
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#12 | |
Senior Member
Kira
Join Date: Nov 2020
Location: Canada
Posts: 435
Rep Power: 8 |
Quote:
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hexa, icem, pre-mesh |
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