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

[ICEM] Structured Hexa Mesh on Wing

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

Like Tree12Likes

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 23, 2012, 06:47
Default Quality
  #21
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
Quality is good enough (min 0.64) and can be improved further by adjusting the blocking.

Far is offline   Reply With Quote

Old   March 23, 2012, 08:34
Default Method2_Modified
  #22
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
There is little modification in method 2 >>>> Method 2 - Modified

Instead of O-Block in the tip region in leading edge block, this time I have used C-topology(selecting two rear edges).



Attached Files
File Type: zip wing0015_Method2_Mod.zip (31.2 KB, 119 views)
Far is offline   Reply With Quote

Old   March 23, 2012, 15:50
Default Method 3
  #23
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
Method 3

Y-blocking is not needed for this topology scheme.

Blocked collapse or node merge was not used.

O-grid is created around wing and inside wing tip block. See attached files and Pics.








Attached Files
File Type: zip wing0015_oblockoblock_method3.zip (27.9 KB, 121 views)
Far is offline   Reply With Quote

Old   March 27, 2012, 05:46
Default
  #24
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
Far thank you very much for taking out time and doing this stuff for me but as I have told you I have no experience at all in blocking strategies. If you can create a tutorial or at least a word document narrating the steps for creating the blocks and setting the mesh parameters then it will really help me and I shall be very thankful to you for this. I know I am asking for a bit more but as I have already told you that I have no experience at all in this and no one around me knows about this. Thanks in advance.
cfd seeker is offline   Reply With Quote

Old   March 29, 2012, 10:16
Default
  #25
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Thanks Far for all your hard work on this one... I have been busy at work lately, and working long hours.

There are several ways to handle a 3D wing. This one's key features are a sharp trailing edge (which suggests a C Grid) and a flat wing tip, which is most easily captured with (Blocking => Create => 2D to 3D).

Start with a 2D blocking... But because you will need to keep the flow volume past your wing tip, you also need to mesh inside the airfoil. The topology Far showed works well, or if you can handle wedges in your model, you could just keep the very simple collapsed block you got from collapsing the blocks behind the trailing edge, then add the Ogrid to the front inner block of the airfoil.

Then go to Create Blocks => 2D to 3D and choose the "by translation" option. Put in the width of your box and apply.

Then go and "delete" the blocks that should end up inside the airfoil (or put then in a solid blocking material).

Associate all the edges with the 3D curves, set up edge parameters, etc.

Done.
Far likes this.
__________________
-----------------------------------------
Please help guide development at ANSYS by filling in these surveys

Public ANSYS ICEM CFD Users Survey

This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)...

CFD Online Users Survey
PSYMN is offline   Reply With Quote

Old   May 18, 2012, 16:55
Default
  #26
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
Quote:
Far thank you very much for taking out time and doing this stuff for me but as I have told you I have no experience at all in blocking strategies. If you can create a tutorial or at least a word document narrating the steps for creating the blocks and setting the mesh parameters then it will really help me and I shall be very thankful to you for this. I know I am asking for a bit more but as I have already told you that I have no experience at all in this and no one around me knows about this. Thanks in advance.
http://www.youtube.com/watch?v=mgjRT...ature=youtu.be
studen and inspiron like this.
Far is offline   Reply With Quote

Old   June 11, 2012, 07:06
Default
  #27
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
Far kindly explain the method-2 in detail, i want to know how you have split- ed the wing tip block and inserted O-grid at leading edge and Y-block at trailing edge?? by which method you have inserted Y-block at the trailing edge?? and you have split-ed the main block in method-2 as you have explained in your video tutorial....am i right??
cfd seeker is offline   Reply With Quote

Old   June 11, 2012, 07:18
Default
  #28
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
first split tip block (across all other blocks as well) and then

1. For leading edge block >>> go to oblock panel and insert the oblock and select two faces parallel to tip face.

2. For trailing edge block >>>> go to edit block and convert into Y-block.

Quote:
you have explained in your video tutorial....am i right??
Yes
Far is offline   Reply With Quote

Old   June 11, 2012, 15:30
Default
  #29
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
Finally, I concluded that for wing with sharp trailing edge, the best domain is circular (hemisphere in 3d) shape at inlet and rectangular at outlet (cylinder)
Far is offline   Reply With Quote

Old   June 12, 2012, 03:03
Default
  #30
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
I am still confused how to implement the method no.2, I am going to explain my understanding, kindly direct me where i will be wrong.
Method 2-O-grid around leading edge and Y-grid in the trailing edge
after splitting the main block using 2 points near the leading edge,edge to curve association fallowed by O-grid only around the wing(not around the wing tip block...am i right here?), then the block split behind the trailing edge fallowed by tip block split into leading edge and trailing edge blocks(where to split the tip block? at half chord?) and finally O-grid around leading edge block and Y-block around trailing edge block.
Few more questions......
1. In the tip region, Ogrid willbe created in the block or around the block?
2. Y-block will be inserted using vertex merge method or what method?
3. You said split the tip block across all other blocks....by "across all other blocks" you mean the block passing inside the wing also?
blgypeng likes this.
cfd seeker is offline   Reply With Quote

Old   June 12, 2012, 15:39
Default
  #31
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
anyone please..........
cfd seeker is offline   Reply With Quote

Old   June 13, 2012, 04:13
Default
  #32
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
I have almost learned the method 2 expect few steps...after splitting the tip block if the O-grid around the leading edge will be inserted then why we need to select the faces parallel to tip block? or I may be wrong here?? if yes then kindly direct me?
cfd seeker is offline   Reply With Quote

Old   June 13, 2012, 04:55
Default
  #33
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
can you post the last few steps of your working? Where are you stuck up?

Also post .blk and .tin file.
Far is offline   Reply With Quote

Old   June 14, 2012, 07:17
Default
  #34
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
My case is a bit different from the Naca 0015 wing case. Wing is not symmetric rather its cambered, so I decided to use method no.2 for blocking the geometry(O-grid around the block and Y-block in the tip block in the vicinity of trailing edge and O-block in the vicinity of leading edge).
I am explaining my effort in few steps so that you can figure out my mistake.....
1. 3D blocking, splitted the main block using the 2 points near the leading edge.
2. Necessary edge to curve association and vertex moved to form the block inside wing
3. Collapsed the block behind the trailing edge and vertex moved to fit the block inside wing
4. O-grid around the wing and tip block(0.1m block using absolute checked on)
5. Splitted the tip block(across the block inside wing) near the trailing edge

The work till step 5 is attached in post with the name "wing_hexa"
After this I am stucked up, I am trying to insert O-grid around the leading edge block(wing and tip block both) but not getting the blocking like as you did.
My wrong effort is attached in the post with name "wing_hexa_wrong"
I WANT TO KNOW....how you got the rounded block all around the wing and tip block and how you fitted the Y-block in the tip near trailing edge

Thanks in advance
Regards
Attached Files
File Type: zip wing_hexa.zip (26.6 KB, 51 views)
File Type: zip wing_hexa_wrong.zip (27.3 KB, 24 views)
cfd seeker is offline   Reply With Quote

Old   June 15, 2012, 07:15
Default
  #35
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
have you seen my blocking files???
cfd seeker is offline   Reply With Quote

Old   June 21, 2012, 13:35
Default
  #36
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
Your blocking was very confusing there were a lot of blocks. i couldn't follow it. When i get lost like that. i erase and redo everything. maybe you are in hurry to start simulation. i made a blocking for you. take a look at it. while simulating, you can come back to geometry and analyse what was wrong.
starting by initializing a block, splitting around airfoil.
then i create an o-grid inside that split, collapsed the block by merging vertices.
next split again the o-grid around your airfoil. you will then have two zones, one for leading edge and trailing edge. it is better to start by a small o-grid inside the leading edge, then you create the Y-grid for the trailing edge. after that come another y-grid for behind the airfoil. then you adjust vertices to get good quality
Attached Files
File Type: zip wing_hexa.zip (52.0 KB, 59 views)
Far likes this.
__________________
Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali
diamondx is offline   Reply With Quote

Old   June 21, 2012, 16:03
Default
  #37
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
ok as i understood, when you splitted the main block, you directly performed association ?
NO, when you split the main block, the new block you get shouldn't be associated to the wing, you have to split it one more time into another o'grid. then you will associate with the wing. don't think about splitting AROUND. you got it ?
__________________
Regards,
New to ICEM CFD, try this document --> https://goo.gl/KAOIwm
Ali
diamondx is offline   Reply With Quote

Old   June 21, 2012, 16:06
Default
  #38
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
Thanx Ali....i have a question
1. After the initial split, we will create Ogrid inside the wing block and tip block(tip block is the block extending from the tip in the z-direction) or we will create Ogrid around wing block and tip block? I am considering Ogrid inside block and around block are different things, am I right? Please explain this point in detail
cfd seeker is offline   Reply With Quote

Old   June 21, 2012, 16:14
Default
  #39
Senior Member
 
Join Date: Mar 2011
Location: Germany
Posts: 552
Rep Power: 20
cfd seeker is on a distinguished road
oh you replied before me i just noticed it
yes exactly after the initial split i associated the edges to curves to get the block inside the wing...tell me what i have to do instead?? and you are talking about "you have to split it one more time into another o'grid"...I am not getting this, please explain it in more detail....I guess this is my problem where I am stuck up....
cfd seeker is offline   Reply With Quote

Old   June 21, 2012, 16:16
Default
  #40
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
INSIDE.look at the picture below. the initial block gave the block in red.
After that i created an ogrid inside , which is the green one. i then applied association.
after that i splitted vertically, which is purple line.
then i created another ogrid INSIDE, which is orange.
Then finally transformed the block behind in ygrid

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

Reply

Tags
blocking strategy, icem cfd airfoil geometry

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


LinkBacks (?)
LinkBack to this Thread: https://www.cfd-online.com/Forums/ansys-meshing/98390-structured-hexa-mesh-wing.html
Posted By For Type Date
ICEM Hexa meshing tutorial - Wing with sharp trailing edge This thread Refback October 18, 2013 04:30

Similar Threads
Thread Thread Starter Forum Replies Last Post
[ANSYS Meshing] Workbench 13: Structured Hexa Meshes rooftop ANSYS Meshing & Geometry 19 March 31, 2016 03:33
Exporting structured mesh from ICEMCFD to Fluent? jeevan kumar FLUENT 1 January 23, 2012 12:21
[snappyHexMesh] snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Meshing & Mesh Conversion 2 March 27, 2011 22:11
Highly skewed and inverted volumes in wing mesh makaero FLUENT 0 December 8, 2009 20:32
Structured Grid Definition craig shores Main CFD Forum 3 March 21, 2001 15:48


All times are GMT -4. The time now is 13:11.