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

[ICEM] suggestion for blocking strategy and meshing a corner

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

Like Tree11Likes

Reply
 
LinkBack Thread Tools Display Modes
Old   November 8, 2013, 07:52
Default
  #21
Member
 
Sheng
Join Date: Jun 2011
Posts: 58
Rep Power: 7
micro11sl is on a distinguished road
Quote:
Originally Posted by Far View Post
Steps are:

1. Make the initial block

2. Make one horizontal spilt

3. Make 4 vertical splits. One is at the end of ramp and other few units before it.

4. Delete the block in lower right corner

5. merge vertices at the end of ramp and now you have wedge block

6. Go to y-block command apply on it

7. Make associations

8. Again select all blocks, faces on two sides of your geometry (symmetry) and other faces where you don't want O-grid

9. Smooth mesh in wedge block, but be careful using parameters for smoothing.
If you use 2D blocking, Y Block from the panel cannot be used. It is tricky to do it. You need go to the Ogrid splitting, now selecting two edges to create a Y block. Remember, when you select no edge, you get an Ogrid. When you select one edge, you get C grid. When you select two edges, you get Y grid. When you finish the Y block splitting, the raw blocking may have redundant parts, so use merge block etc to make it nice.
Daniel_Khazaei likes this.
micro11sl is offline   Reply With Quote

Old   November 10, 2013, 07:57
Default
  #22
Senior Member
 
Daniel
Join Date: Mar 2013
Posts: 210
Rep Power: 13
Daniel_Khazaei will become famous soon enough
Quote:
Originally Posted by Far View Post
Steps are:

1. Make the initial block

2. Make one horizontal spilt

3. Make 4 vertical splits. One is at the end of ramp and other few units before it.

4. Delete the block in lower right corner

5. merge vertices at the end of ramp and now you have wedge block

6. Go to y-block command apply on it

7. Make associations

8. Again select all blocks, faces on two sides of your geometry (symmetry) and other faces where you don't want O-grid

9. Smooth mesh in wedge block, but be careful using parameters for smoothing.
I have tried your method, but with out boundary layer part which I was not able to produce like the one you have provided.

The convergence is now smoother and the minimum quality is equal to 0.892.

but mesh density near the corner is a problem in my unsteady simulation.

I have to decrease the time step just because of that region!
Attached Images
File Type: jpg Capture.JPG (39.8 KB, 13 views)
File Type: jpg Capture1.jpg (95.5 KB, 16 views)
File Type: jpg Capture2.jpg (83.6 KB, 15 views)
Daniel_Khazaei is offline   Reply With Quote

Old   November 10, 2013, 09:10
Default
  #23
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,283
Blog Entries: 6
Rep Power: 43
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
this is almost similar to what i did. Only difference is that I made one extra split before Y-grid. Now you can apply ogrid to improve solution accuracy and convergence. Or you can make ogrid first and then merge vertices and Yblock.


why you are solving 3d problem?
Daniel_Khazaei likes this.
Far is offline   Reply With Quote

Old   November 10, 2013, 09:39
Default
  #24
Senior Member
 
Daniel
Join Date: Mar 2013
Posts: 210
Rep Power: 13
Daniel_Khazaei will become famous soon enough
Quote:
Originally Posted by Far View Post
this is almost similar to what i did. Only difference is that I made one extra split before Y-grid. Now you can apply ogrid to improve solution accuracy and convergence. Or you can make ogrid first and then merge vertices and Yblock.


why you are solving 3d problem?

It is not actually a 3D problem, I am using OpenFOAM and as you know it only works in 3D. So any geometry must have 3 dimensions. However if we only need to solve a problem in 2 dimensions, defining the planes perpendicular to the third direction as "empty" type, will do the job.
Daniel_Khazaei is offline   Reply With Quote

Old   November 11, 2013, 16:22
Default
  #25
Senior Member
 
Daniel
Join Date: Mar 2013
Posts: 210
Rep Power: 13
Daniel_Khazaei will become famous soon enough
Quote:
Originally Posted by Far View Post
this is almost similar to what i did. Only difference is that I made one extra split before Y-grid. Now you can apply ogrid to improve solution accuracy and convergence. Or you can make ogrid first and then merge vertices and Yblock.


why you are solving 3d problem?
I have tried to add the boundary layer part to my previous mesh. Is there any suggestion to improve it even further?


thanks in advance
Attached Images
File Type: jpg 1.JPG (47.2 KB, 12 views)
File Type: jpg 2.jpg (80.1 KB, 15 views)
Daniel_Khazaei is offline   Reply With Quote

Old   November 11, 2013, 23:21
Default
  #26
Far
Super Moderator
 
Sijal
Join Date: Mar 2009
Location: Islamabad
Posts: 4,283
Blog Entries: 6
Rep Power: 43
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
you did first O-grid and Y-grid? Seems so!!!. Now its perfect
Daniel_Khazaei likes this.
Far is offline   Reply With Quote

Old   November 12, 2013, 06:26
Default
  #27
Senior Member
 
Daniel
Join Date: Mar 2013
Posts: 210
Rep Power: 13
Daniel_Khazaei will become famous soon enough
Quote:
Originally Posted by Far View Post
you did first O-grid and Y-grid? Seems so!!!. Now its perfect
yes...

1- I have done vertical and horizontal splits as you suggested.

2- I have removed the block at lower right corner.

3- I have applied the O-grid.

4- a little playing with merge & move vertices to make it nice.

5- Then I have applied Y-block


many thanks for your help
Daniel_Khazaei is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ANSYS Meshing] Blocking and Meshing Strategy for an open flow domain over backward facing ramp Crank-Shaft ANSYS Meshing & Geometry 0 January 11, 2013 06:48
[ICEM] Meshing strategy for 3D sharp point D-willism ANSYS Meshing & Geometry 22 October 15, 2012 06:06
meshing strategy for IC engine. Upendra Main CFD Forum 1 September 30, 2012 02:32
[ANSYS Meshing] Meshing strategy for External Flows Hybrid ANSYS Meshing & Geometry 0 January 24, 2012 15:27
meshing strategy for tight fit. jemteo CFX 4 August 10, 2004 02:30


All times are GMT -4. The time now is 22:27.