CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > ANSYS Meshing & Geometry

[ICEM] Blocking strategy for a Multi Element Airfoil (ICEM)

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By diamondx

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 3, 2013, 13:38
Default Blocking strategy for a Multi Element Airfoil (ICEM)
  #1
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
Hey everyone,

for some days now I'm working on a blocking strategy for a multi-element airfoil in ICEM. My plan is to use a CHgrid. I've alredy meshed the single-element one porperly, but now I'm stuck. Unfortunately, I also could not find any tutorials or proper papers regarding multi-element airfoil meshing.
My plan was to use one Ogrid Block in combination with the rearmost edge of the farfield for each element to create the Cgrid. But that does not work as intended.
Now I was hoping, you guys could give some ideas and new thoughts on the topic. I'm not exactly explaining, how I was trying to mesh the geometry, so I eventually can get some new suggestions.

Here a screenshot of the airfoil:
http://imageshack.us/photo/my-images/534/airfoilm.jpg/


mix

Last edited by mix; March 4, 2013 at 09:53.
mix is offline   Reply With Quote

Old   March 4, 2013, 09:53
Default
  #2
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
After working a few more hours, I've achieved some results, but also an error.
I want so split a vertex, but ICEM only gives me the error "unusual neigborhood" (see the image attached). Does anybody know this error or how to solve it? Unfortunately, I could not find a solution for this.

mix is offline   Reply With Quote

Old   March 4, 2013, 11:27
Default
  #3
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
Posts: 1,385
Blog Entries: 23
Rep Power: 29
diamondx will become famous soon enough
not many times, the split vertex has worked well for me. before using it, why don't you click on previous and jump where your merge those vertex. see why you needed to merged them... may be you didn't have to.
__________________
Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali
diamondx is offline   Reply With Quote

Old   March 4, 2013, 11:44
Default
  #4
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
Sorry for asking, but what exactly do you mean with "click on previous"? I haven't recognized this option yet. Or do you simply mean "undo"?
mix is offline   Reply With Quote

Old   March 4, 2013, 11:45
Default
  #5
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
Posts: 1,385
Blog Entries: 23
Rep Power: 29
diamondx will become famous soon enough
sorry, i meant undo nothing magical here
__________________
Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali
diamondx is offline   Reply With Quote

Old   March 4, 2013, 11:49
Default
  #6
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
Alright.
The Problem is, I saved several times in between, so I can't undo to that specific point. I probably will built up the model once again to work around the problem.
mix is offline   Reply With Quote

Old   March 4, 2013, 11:52
Default
  #7
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
Posts: 1,385
Blog Entries: 23
Rep Power: 29
diamondx will become famous soon enough
when you save, icem does not replace your blocking, he keeps a backup of it. and keep just the last one. go to your folder you will find a lot of file with the extension blk0,blk1,bl2. those are backups of your blocking, just change the extension to blk and it will work again.
Bollonga likes this.
__________________
Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali
diamondx is offline   Reply With Quote

Old   March 5, 2013, 05:32
Default
  #8
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
I produced some results I want to shear.
I am aware, that there ist quite much skewness, especially at the slat between the airfoils. My blocking strategy was to first generate the cgrid for the main airfoil and afterwards the one for the flap, so I could fit one to the other.
Feedback and tips for improving the mesh would be awesome.

Mesh:
http://imageshack.us/photo/my-images...turedmesh.jpg/

Slat:
http://imageshack.us/photo/my-images/805/slat.jpg/

Blocking:
http://imageshack.us/photo/my-images/708/blocking.jpg/
mix is offline   Reply With Quote

Old   March 5, 2013, 08:26
Default
  #9
Far
Senior Member
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,558
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
Blocking is not great... Quarter O-grid is necessary...
Far is offline   Reply With Quote

Old   March 5, 2013, 08:47
Default
  #10
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
Hey Far,

could you explain what you mean with "Quarter O-grid" a bit mor in detail? I'm just learning to use ICEM and I'm not familiar with all the options/possiblities.
mix is offline   Reply With Quote

Old   March 5, 2013, 08:57
Default
  #11
Far
Senior Member
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,558
Blog Entries: 6
Rep Power: 54
Far has a spectacular aura aboutFar has a spectacular aura about
Send a message via Skype™ to Far
http://www.cfd-online.com/Forums/ans...ler-blade.html
Far is offline   Reply With Quote

Old   March 5, 2013, 09:02
Default
  #12
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
Thanks!
I will try this one on my model. If requested, I will post my results, as they are done.
mix is offline   Reply With Quote

Old   March 5, 2013, 13:46
Default
  #13
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
Far, I assume you mean something like this:



For now, just for the main airfoil and no mesh refinement ore anything like that is done. It will get interesting to adopt it for the flap.

-----

First attempt with meshed flap:


Last edited by mix; March 5, 2013 at 14:45.
mix is offline   Reply With Quote

Old   March 7, 2013, 05:46
Default
  #14
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
Sorry for another double post, but I do need some more help with this one.
As I can not find any proper sources for multi element airfoil hex meshing, some ideas, especially with the blocking of the flap, would be extremely helpful.
My way until now was to first block the main element and after finishing this one, splitting blocks to generate a mesh for the flap. My problem now is, that in this way many small linked blocks appear which I don't know how to deal with properly. I don't thing merge blocks is the way to go, as I tried this option which did not result in a proper mesh.
mix is offline   Reply With Quote

Old   March 7, 2013, 11:23
Default
  #15
Super Moderator
 
diamondx's Avatar
 
Ghazlani M. Ali
Join Date: May 2011
Location: Tokyo, Japan
Posts: 1,385
Blog Entries: 23
Rep Power: 29
diamondx will become famous soon enough
did you see this thread : http://www.cfd-online.com/Forums/ans...ic-trough.html

it might help you...
__________________
Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali
diamondx is offline   Reply With Quote

Old   March 7, 2013, 12:33
Default
  #16
mix
New Member
 
Michael
Join Date: Dec 2012
Location: Karlsruhe, Germany
Posts: 16
Rep Power: 13
mix is on a distinguished road
I did see this thread and I even built up the blocking for the main element as discribed there. The problem is the flap.
As I described, blocking it leads to several little linked blocks, as I blocked the main element first and then splitted the blocks to fit the flap.
mix is offline   Reply With Quote

Old   January 17, 2016, 14:41
Default 3 Element Blocking in ICEM
  #17
Senior Member
 
Alhasan's Avatar
 
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15
Alhasan is on a distinguished road
Hello ALL,

Does anybody know or have any images of blocking for three element airfoils with slat and flap,

- I would like to know how to efficiently block and mesh the slat region in ICEM.

In the attached Image, can some one tell me how to solve the regions which is marked in RED

Thanks for your time and Effort.
Kind Regards,

Hasan K.J
Attached Images
File Type: jpg Capture1.JPG (185.3 KB, 103 views)
__________________
"Real knowledge is to know the extent of one's ignorance." - Confucius
Alhasan is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Having several dificulties with 3d airfoil meshing in ICEM CFD Teja ANSYS Meshing & Geometry 14 February 23, 2015 14:01
[ICEM] o grid blocking strategy? icemaniac178 ANSYS Meshing & Geometry 14 March 20, 2013 00:18
ICEM 5.1 to CFX Prism Element ashish CFX 1 April 6, 2005 19:32
multi element airfoil data shadi memarpour Main CFD Forum 0 June 20, 2004 05:33
Multi Element Airfoil J.Dumas Main CFD Forum 2 May 13, 2000 08:24


All times are GMT -4. The time now is 14:20.