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[ICEM] Blocking Strategy (Perpendicular CYLs) |
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June 8, 2015, 14:01 |
Blocking Strategy (Perpendicular CYLs)
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#1 |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
Geometry consists of a hollow cylinder and two pipes normal to it.
Created blocking for all three cylinders independently (beginner level) by assigning them all different body points. files are also attached for reference to what i did. edit: please check google drive link for files in second post. Last edited by attiquejavaid08; June 9, 2015 at 09:55. |
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June 9, 2015, 09:27 |
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#2 |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
I have managed to block hollow cylinder with it's connection to one pipe (marked in figure). i'm getting very low quality hexas at cylinder connection to pipe. i have tried a lot and still doing so to cope it up but still in vain. I want to create o-grid later for boundary layer capture.
blocking file is attached. if someone can help me out and suggest me what is needed to do then please. i'll be very thankful https://drive.google.com/file/d/0B4Y...ew?usp=sharing June 15, 2015 edit: updated geometry file with new blocking approach attached here and #9 https://drive.google.com/file/d/0B4Y...=sharing&pli=1 Last edited by attiquejavaid08; June 15, 2015 at 03:09. |
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June 13, 2015, 07:22 |
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#3 | |
Senior Member
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Quote:
prophot.jpg Regards Shereez |
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June 13, 2015, 07:25 |
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#4 |
Senior Member
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Also, the last step I suggested is an O grid face adding which can improve the skewed surface of the connection between belt and inlet or outlet cylinder. However without this step ( O grid faces) you should still be able to achieve good quality without much trouble. If you add o grid faces there will be added vertices and edges thus you should manually move them to the right places ( even the internal edges since fluid is flowing through them in this project).
So yeah good luck and come back to discuss what else could be done. Hope it helps you |
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June 13, 2015, 13:14 |
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#5 | |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
Quote:
your tip of meging vertices improved quality. joining area is still a problem as it was, where highly skewed elements are. idea of of adding ogrid-face for vertices like this, being a beginner, it was a good tip for me to consider in future. for this geometry, joining block (middle block in figure 03) is already small enough as per my understanding that dividing it into smaller blocks and having vertices there, results in improvement in quality but not at joining section of large hollow cyl and small normal cyl. check the images please. and revised blocking file attached as well. Last edited by attiquejavaid08; June 13, 2015 at 15:41. |
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June 13, 2015, 15:51 |
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#6 |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
my objective and issue.
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June 14, 2015, 19:04 |
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#7 |
Senior Member
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Hi Attique. Sorry for the late reply. As I told you in PM i was away until today.
Anyway check this blocking I have revised for you just now? I have assosciated some curves and changed edge meshing parameters, moved some vertices around. Min quality is 0.2 and above at the connection now. I improved only one connection and for the other one I did not do anything coz you know you can observe, figure out and re apply what I have done there for the first connection as geometry is similar. Is this what you were looking for? PICTUREREVISED2.jpg and the blocking file from my drop box: https://www.dropbox.com/s/4afzlxlicg...VISED.blk?dl=0 |
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June 15, 2015, 00:00 |
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#8 | |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
Quote:
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June 15, 2015, 01:02 |
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#9 | |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
Quote:
kindly do check it please. and pictorial description: Last edited by attiquejavaid08; June 15, 2015 at 03:07. |
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June 15, 2015, 07:36 |
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#10 | |
Senior Member
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Quote:
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June 16, 2015, 07:48 |
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#11 |
Senior Member
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Seems to me like where you have created O grid inside the elements are of low quality due to very fine wall spacing there? 1e-06? Is this the cell initial height you are going for?
And you can try to do this : edit edge - spline or automatic linear bend the edges so they represent a circle. Even the O grid internal edges. Furthermore some associations also seem to be wrong. One of the internal edges was projected to a surface. Review again. |
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June 16, 2015, 07:53 |
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#12 | |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
Quote:
i am going to review what you said. will check it shortly and later i'll post thre results. Last edited by attiquejavaid08; June 17, 2015 at 03:08. |
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June 16, 2015, 07:55 |
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#13 |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
i want to ask one more question. should i consider "build topology" when i import my geometry from designmodeler? is it necessary?
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June 17, 2015, 03:13 |
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#14 |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
Hello shereez and everyone who is reading this post!
I’m very thankful for timely response of shereez which made me able to keep looking for issues, errors. (to be honest, at one point I was so frustrated and I just wanted to back off last night. Just took a little break from it.) A little change in blocking and to make better associations as per my understanding, i added curves and points on horizontal plane as separate parts so that at one time using index control of blocking I can concentrate on a single curve and points on it. This geometry breaking really helped me a lot in figuring out the issues which were probably due to some wrong associations I made (pointed out by shereez as well). updated geometry and blocking files before and after ogrid are attached as following: https://drive.google.com/file/d/0B4Y...ew?usp=sharing I’m happy I have not expertise in ICEM but having a helping hand through this forum and going through discussions, other’s work and doing practice hard this meshing tool is making sense to me now. There are still a lot of things to do. AJ |
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June 17, 2015, 03:15 |
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#15 | |
Member
Attique Javaid
Join Date: Apr 2015
Location: Pakistan
Posts: 66
Rep Power: 11 |
Quote:
I’m very thankful for timely response of shereez which made me able to keep looking for issues, errors. (to be honest, at one point I was so frustrated and I just wanted to back off last night. Just took a little break from it.) A little change in blocking and to make better associations as per my understanding, i added curves and points on horizontal plane as separate parts so that at one time using index control of blocking I can concentrate on a single curve and points on it. This geometry breaking really helped me a lot in figuring out the issues which were probably due to some wrong associations I made (pointed out by shereez as well). updated geometry and blocking files before and after ogrid are attached as following: https://drive.google.com/file/d/0B4Y...ew?usp=sharing I’m happy I have not expertise in ICEM but having a helping hand through this forum and going through discussions, other’s work and doing practice hard this meshing tool is making sense to me now. There are still a lot of things to do. shereez, i'm not good at editing edges yet, but next i'm gonna give it try. AJ |
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June 17, 2015, 05:08 |
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#16 | |
Senior Member
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Quote:
Hi. I looked at your updated project this morning. And the one with O grid blocking seems to be well done with only a few improvements I brought to it. I did not play with any wall spacing. However I increased the amount of nodes on the small curve of the big belt where problematic elements were. And I moved some nodes. Have a look at these pics. This is quality interms of unstructured hexa - not premesh quality remember. (EDIT: I have just seen that I was not able to capture the quality histogram into this photo - but it was 0.25 and above for ICEM quality) qualiTY_MATRIX.jpg Now I have also checked this improved mesh via fluent - and here is a screenshot of mesh quality and statistics. Min orthogonal quality is 0.17 I think. fluent_PRO_PIC.jpg pp.jpg Updated flies can be downloaded from my dropbox - I will share the folder with you in PM. Regards Shereez |
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