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October 17, 2012, 06:29 |
Problems with meshing of wind turbine
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#1 |
New Member
Join Date: Jan 2011
Posts: 3
Rep Power: 15 |
Hey guys,
I am pretty new to Ansys ICEM and I am currently working on meshing a whole horizontal wind turbine (50 m radius) with tower and ground. At the end I want to compare Ansys CFX and OpenFOAM based on this mesh. My plan is to have at the end a stationary far field domain with the tower and a rotating disk/domain for the rotor. Up to now I managed to mesh the rotor disk (14 million cells, hex) with a sufficient quality. As the blocking of the rotor is a lot of work, I used the symmetry of the rotor to save some work. So I meshed only one third of the rotor and then copied the geometry and the blocking of one blade. This worked so far, now I have the problem to include the far field and the tower. To use the symmetry of the rotor I first had to exclude the farfield (not symmetric like rotor) and the tower. Now after having the rotor blocked and I would like to "extend" my blocking to the whole domain, but I am not getting this done correctly. And I dont know if its possible anyway.. So my questions: Is it somehow possible to create the complete meshing in one ICEM project? I attached some screenshots so that you guys know what I am talking about, the tower is not included yet. The size of the far field is also not final yet. I would be very grateful if you could help me with my problem! Thanks a lot in advance! Regards from Germany, Bastian |
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October 17, 2012, 12:41 |
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#2 |
Super Moderator
Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
Posts: 1,385
Blog Entries: 23
Rep Power: 29 |
so you did a blocking just for your wind turbine... the only way to expand it is to use the extrude faces... otherwise you should have started with a initial block around the hole geometry them perform splits and use index blocking to ease the works. i can't think of another way to expand you blocking, may be a new blocking of farfield then a merge... i don't think that will work.
I hope i'm wrong, let's see opinions of other member... |
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October 17, 2012, 23:30 |
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#3 |
New Member
pavan kumar
Join Date: Aug 2012
Posts: 1
Rep Power: 0 |
hi...
I'm new to icem cfd.I'm doing analysis on an aircraft model as my final year project.I would like someone to help me in meshing the model.Actually when I meshed the model, I'm not able to capture the leading edge properly...Plz help me with this.... |
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October 18, 2012, 04:36 |
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#4 |
New Member
Join Date: Jan 2011
Posts: 3
Rep Power: 15 |
yes, I did the blocking only for the turbine as I otherwise would have not been able to use the symmetry of the rotor. Blocking (and meshing) farfield and turbine separately is maybe a better option, I already thought about that. To merge them in ICEM did not work so far.
I think in OpenFOAM there is a possibility to use two different meshes and as far as I know in CFX as well. As the rotor disk should rotate I anyway need the GGI interfaces right? But I am not sure about the influence of the mesh cell ratio between both sides of the interfaces on the quality of the results. Is there a "rule" for a minimum cell ratio between the rotor disk side and the farfield side of the interfaces? Thanks a lot for your help! regards from Germany, bastian |
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October 18, 2012, 08:08 |
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#5 | |
Senior Member
Christoph
Join Date: May 2011
Location: Germany
Posts: 182
Rep Power: 18 |
Quote:
yes, it's possible to do it in one project. but you've to use sub-topo to stay on top of things. just rmb on topology -> create sub-topo -> select blocks to extract. you can either merge them together later on, or do meshing for each sub-topo and connect them in cfx-pre via ggi. I prefer to merge the sub-blocking and do the interface in ICEM.....but hey, that's up to you. you need 3 rot/stat interfaces. inlet, outlet and circumferential direction (as you don't have a casing around your wind turbine ). what shape does the tower have? the biggest benefit of using sub-blocking is, that you have a consistent mesh and no cell size issues @interfaces. but if it's not possible to get a good mesh (e.g bad cell angles), rather use a ggi or use a hybrid mesh. I can't give you further advice without any pics of tower shape etc. |
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November 12, 2012, 03:32 |
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#7 |
Senior Member
AB
Join Date: Sep 2009
Location: France
Posts: 323
Rep Power: 22 |
What about making the blocking of your farfield without the turbine, conver to unstructured mesh, and do a conformal merge wih the unstructured mesh of the turbine.
That's the easiest (and fastest) way of doing it I think. |
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November 12, 2012, 03:41 |
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#8 |
Senior Member
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@Broly What about making the hybrid mesh : Hexa in vicinity of blade and tetra in the rest of the domain? Then you may connect the both regions through merge or interface
But I would really be interested in Hexa meshing |
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November 12, 2012, 12:20 |
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#9 |
Senior Member
AB
Join Date: Sep 2009
Location: France
Posts: 323
Rep Power: 22 |
Yep it should work as well, but I thought Hexa was the only option for this problem
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November 12, 2012, 13:13 |
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#11 |
Senior Member
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November 13, 2012, 05:00 |
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#14 |
New Member
Join Date: Jan 2011
Posts: 3
Rep Power: 15 |
hey guys,
@ energy382 sorry that I didn't reply on your post but I was on vacation and had some other stuff to do now I am back on my mesh... for now I meshed farfield and rotordisk separately (hex) and I am now testing GGI connections to connect both meshes. I also worked a bit on your hint with the sub-topology, although it is difficult to use the periodicy of the rotor, this might work. I have to get back to this if my actual concept does not work. |
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November 13, 2012, 06:41 |
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#15 |
Senior Member
Christoph
Join Date: May 2011
Location: Germany
Posts: 182
Rep Power: 18 |
I've done this kind of simulation before (with ICEM hexa). As soon as time permits, I'll give you some suggestions
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