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July 12, 2009, 16:33 |
Blocking strategy
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#1 |
Member
Michal
Join Date: Mar 2009
Posts: 38
Rep Power: 19 |
Hi
What will be the best blocking strategy ( 2D only for fluid around the blade) for this geometry. Thanks in advance. |
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July 13, 2009, 21:59 |
Example...
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#2 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
Try something like this...
Basically, you use quarter ogrids on each end to shift the flow and give you more mesh where you need it, but things hook up periodic in the end... You can do lots of similar things (I always start with a pen and paper). You could add more quarter ogrids to off set it more, or you could do an lgrid which puts more mesh out the back... I am interested in what other good layouts our clever colleagues and post here. |
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July 14, 2009, 19:46 |
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#3 |
Member
Michal
Join Date: Mar 2009
Posts: 38
Rep Power: 19 |
Hi,
thanks for quick reply. I made this blocking but I have another question. When I change edge parameter on one edge it influent to other edges and I can’t set proper number of nodes. Why? |
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July 15, 2009, 09:46 |
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#4 |
Member
Michal
Join Date: Mar 2009
Posts: 38
Rep Power: 19 |
Hi, it’s me again I know why those edges was dependent and I couldn’t set proper number of nodes. I don’t delete block permanently.
Regards |
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July 15, 2009, 10:49 |
Tip Gaps
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#6 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
On the other hand, if you need to model the tip gap, you will need to use a blocking straegy that does not rely on deleting that inner block. The quarter ogrid trick I showed can be slightly modified to work without deleting your inner block.
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July 15, 2009, 19:26 |
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#7 |
Member
Michal
Join Date: Mar 2009
Posts: 38
Rep Power: 19 |
Hi I have another problem, I don’t know how to fix penetrating elements. For mesh consist of 600 000 elements I have about 5000 penetrating elements on boundary fluid-solid . I think that is the reason why I can’t decrease y+ below 1.
Thanks in advance |
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July 16, 2009, 14:50 |
scan planes to the rescue
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#8 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
This could be due to a bunch of things, most likely projection (association) issues. View some cross sections (scan planes) across the area where the penetration is happening and try to figure out what is not projecting correctly...
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July 19, 2009, 17:18 |
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#9 |
Member
Michal
Join Date: Mar 2009
Posts: 38
Rep Power: 19 |
Hi.
You was right Simon it was association problem, I don’t associate some curves. Now I don’t have penetrating elements and y+ is bellow 1. Thank You very much. Regards |
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June 25, 2010, 18:55 |
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#10 |
Senior Member
Saima
Join Date: Apr 2009
Location: Canada
Posts: 185
Rep Power: 16 |
Hello,
Do you guys please let me know how you creat this outer boundary of blade is there any rule? if yes pls let me know? Secondly how u did meshing in ICEM CFD i did tutorial which is available on you tube but still i am not getting how i can do for blade? If you have some documentation on it pls send me on samahmedpk2000@hotmail.com Thank you and Regards, |
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June 27, 2010, 14:07 |
2D NASA Rotor 67 Blade prifile blocking
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#11 |
New Member
t_shirt
Join Date: May 2010
Posts: 8
Rep Power: 16 |
Hi,
Could ypu please let me know how can i creat blocking for this profile? Pic is atatched here. |
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June 28, 2010, 13:09 |
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#12 |
Member
Michal
Join Date: Mar 2009
Posts: 38
Rep Power: 19 |
Hi,
Watch this tutorial, it should help. http://www.youtube.com/watch?v=tYrbS...eature=related Regards |
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