CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Mesh Generation & Pre-Processing Software > Pointwise & Gridgen

Match BC changes connector point number and distribution

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 3, 2020, 05:11
Default Match BC changes connector point number and distribution
  #1
New Member
 
doruk
Join Date: Apr 2018
Posts: 5
Rep Power: 8
cfdoruk is on a distinguished road
Hi,

I'm using Pointwise to mesh a simple block. When I want to use T-rex and apply the appropriate BCs (Fig. BCs), I'm getting a point stack near the last layer (Fig. Result) and this results in solution problems as expected due to poor mesh quality. What should I do in order to get a T-rex mesh as in Fig. "Desired"?

Thanks
Doruk
Attached Images
File Type: png BCs.PNG (121.6 KB, 23 views)
File Type: png Result.PNG (195.1 KB, 23 views)
File Type: png Desired.PNG (25.2 KB, 22 views)
cfdoruk is offline   Reply With Quote

Old   June 5, 2020, 04:09
Default
  #2
New Member
 
Join Date: Jun 2020
Posts: 1
Rep Power: 0
Floydian is on a distinguished road
After, creating the T-Rex, Pointwise tries to have the spacing of the layer right after last T-Rex layer to be equal to that last T-Rex layer spacing. So you don't see the huge triangle right after T-Rex. This situation usually happens when the last cell of T-Rex has a high aspect ratio (thin and long rectangle).

To fix that, after you create your T-Rex, you can click the connector that has the stacked points (the match bc connector) and then click Grid -> Distribute. In that part, you can go to the Functions tab. You should see that it has a growth function enabled for that connector. And from the Legend, you should see that Begin has a triangle icon, Middle has a circle and End has a square icon. These icons can be seen on the connector you picked. In the Growth Distribution Parameters part (It should come enabled, but if it is not, click the box near it to enable it), you can see the settings for these three.

What you want to do in your case is to have the spacing right after the Middle to be much bigger than the last layer spacing of T-Rex. You should see that at the settings of Middle, Last Layer Spacing is the default choice. You can change that to User Specified Spacing and give a bigger spacing value to achieve the big triangle right after T-Rex ends. You can lower the total amount of points you have on that connector to complement the distribution change.

Another option is to have a break point at the last node of T-Rex layer but the above solution should work before you have to do that.
Floydian is offline   Reply With Quote

Old   June 7, 2020, 05:55
Default
  #3
New Member
 
doruk
Join Date: Apr 2018
Posts: 5
Rep Power: 8
cfdoruk is on a distinguished road
Hi Floydian,

Thank you for your explanatory reply. I followed the steps you mentioned; however, since it is a block, when I re-initialize to block, it again distorts the ends. I tried your second advise, which is using break points, earlier; however, it does not seem to work efficiently with blocks. I'm using it for 2-D well, but as I said, when it comes to blocks, I can't handle it.

Please correct me if I made any step wrong.

Sincerely
Doruk
cfdoruk is offline   Reply With Quote

Old   June 8, 2020, 11:16
Default
  #4
Senior Member
 
David Garlisch
Join Date: Jan 2013
Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office)
Posts: 307
Rep Power: 14
dgarlisch is on a distinguished road
Did you enable the T-Tex "Push Attributes" option?
dgarlisch is offline   Reply With Quote

Old   June 12, 2020, 02:08
Default
  #5
New Member
 
doruk
Join Date: Apr 2018
Posts: 5
Rep Power: 8
cfdoruk is on a distinguished road
Hi David,

Yes I did so. Otherwise much worse problems arise.

Thanks
Doruk
cfdoruk is offline   Reply With Quote

Reply

Tags
distribution, grid, pointwise, skewness, t-rex

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
Decomposing meshes Tobi OpenFOAM Pre-Processing 22 February 24, 2023 09:23
decomposePar problem: Cell 0contains face labels out of range vaina74 OpenFOAM Pre-Processing 37 July 20, 2020 05:38
GenerateVolumeMesh Error - Surface Wrapper Self Interacting (?) AndreP STAR-CCM+ 10 August 2, 2018 07:48
[mesh manipulation] Importing Multiple Meshes thomasnwalshiii OpenFOAM Meshing & Mesh Conversion 18 December 19, 2015 18:57
SigFpe when running ANY application in parallel Pj. OpenFOAM Running, Solving & CFD 3 April 23, 2015 14:53


All times are GMT -4. The time now is 03:32.