SnappyHexMesh Refinement nCellsBetweenLevels
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Hi all,
I am trying to formulate effect of nCellsBetweenLevels parameter. I have meshed one case with different value. I was thinking that when nCellsBetweenLevels=10 ( which i thought that is a very high value) there will be 10 cells between 2 levels of refinement in each direction. But as u can see from the screenshots its not like that at all. When i increase the value to 50, i get hardly 6 cells between two levels. Does anyone can explain me what does the value of nCellsBetweenLevels exactly refers to? nCellsBetweenLevels =10 Attachment 9028 nCellsBetweenLevels =50 Attachment 9029 |
Greetings to all!
@laymelek: Sorry for the reaaaally late reply. That looks like a bug that existed on that older version of OpenFOAM :(. I'm answering to this thread so that questions related to this parameter "nCellsBetweenLevels" this can be discussed in a single thread. At the request of the forum member CFDUser_, I've added a new section "nCellsBetweenLevels" at openfoamwiki.net in the page respective to snappyHexMesh: http://openfoamwiki.net/index.php/Sn...sBetweenLevels If anyone has questions about this, feel free to ask! Best regards, Bruno PS: In case anyone is wondering: the CFD-Online forums prefer that discussions on a particular topic are kept in a single thread. |
Dear Bruno,
What happened when you set nCellsBetweenLayers to 0? can you upload that picture too? I have some suggestions if you may consider them as valid point. 1. When you consider a case by default please specify OpenFOAM version so that one can understand which version can reproduce the same results. 2. Since I have observed the definition of some parameters changed with different versions, please give us Dict files so that one can have clear idea about other parameters too. Thanks a lot for your time and efforts. :) Best Regards, CFDUser_ Quote:
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Dear CFDUser_,
Thanks for the feedback! Quote:
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Beyond this, feel free to edit the wiki page and improve it! Best regards, Bruno |
Dear Bruno,
Good day :). Thanks once again for your explanations. what is gapLevelIncrement in refine surfaces sub-dict? Thanks & Regards, CFDUser_ |
Hi CFDUser_,
If you document in that wiki page one or more parameter(s) with which you are already familiar with, I can try next weekend to figure out and document "gapLevelIncrement". Best regards, Bruno |
Dear Bruno,
Coming 2-3 months are like hectic time for me. I will upload some of the valid cases in feature. My analysis are problem specific, so its not good to update in wiki pages. I will find out better way to post as I cant post my current cases as well. Thanks & Regards, CFDUser_ Quote:
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Hi CFDUser_,
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It's very likely that if you extract only the problematic location of your geometry and create a base mesh only for that location, you'll be able to test a lot faster and a lot more possible workarounds for the problems you are getting with the whole geometry on that particular location. Furthermore, those small test cases will then be so unrelated to the real geometry, that it will probably be almost impossible to deduce what it was from. Beyond this, I'm quoting some feedback you sent me over PM back on August 26th, because this way it'll be easier for me to keep track of the things I still want to do in the near future, and because this way it's kept a public record of who discovered what: Quote:
Best regards, Bruno |
Hello everyone,
I am new in this forum, but I would still like to know, if there is a fix for this bug? I am having the exact same trouble meshing with SHM. |
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Sorry. I seem to have the same problem as the OP.
I am using snappyHexMesh to mesh a simple geometry. When I set up the value nCellsBetweenLevels to 10, my resulting mesh does not have 10 cells between each level. When I set it up to 100 I get a significant change, but still not 100 cells, but someting like 12. Could you please give me some advice? It is almost like what OP has written: Quote:
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Quick answer: OK... what about the instructions I wrote on the aforementioned wiki page section:
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First of all, thanks for your reply.
I read the instructions and checked my SHM-file. Neither point 2 and 3 is the reason for the error. I did not really understand what is meant by point 1 Quote:
Here is a screenshot of the case. Although I set nCellsBetweenLevels to 100, the cells between levels are less than 20. Attachment 66755 |
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Quick answer: Sorry for the late reply, but here is what I've gotten with OpenFOAM 6 (up commit d8da4bd09212, Dec 4 21:32:25):
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