CFD Online Logo CFD Online URL
Home > Forums > Mesh Generation & Pre-Processing Software > Pointwise & Gridgen

3D - T-Rex with different wall spacings (Coanda Jet)

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

LinkBack Thread Tools Search this Thread Display Modes
Old   May 21, 2020, 07:52
Default 3D - T-Rex with different wall spacings (Coanda Jet)
New Member
Join Date: May 2020
Posts: 7
Rep Power: 6
NiklasH108 is on a distinguished road
Hi all,

I am trying to mesh a vehicle model with Coanda actuation at the A-Pillar.
To properly resolve the Coanda Jet, the area around the A-Pillar needs extra refinement and a tighter wall spacing than the rest of the model. Unfortunately, I am really struggling to get a quality mesh with these two different wall spacings.

I attached a few pictures so you can see where the problem is. My approach is to first build a structured block around the A-Pillar for a good resolvement of the jet and then use T-Rex to build the rest of the mesh. Therefore, I set the purple domains of the structured block to a "Match" BC and the green domain to "Wall", just as the rest of the surface domains. If I run T-Rex, the advancing anisotropic fronts immediately stop at the corners of the structured block, which in the end results in highly skew cells in this area.

Has anybody tips how do deal with this problem? Am I doing the right approach with creating a structured block prior to running T-Rex? And which stopping criteria is reached in the areas where T-Rex immediately stops creating anisotropic cells?

Some additional info: To ensure a y+ around 1, I apllied very tight wall spacings - for the Coanda Jet 2e-6m and for the remainder of the surface 8e-6m.

Thanks in advance!

Kind regards
Attached Images
File Type: jpg 01_SurfaceMesh-FullView.jpg (164.4 KB, 16 views)
File Type: jpg 02_SurfaceMesh-A-Pillar-Highlited.jpg (200.3 KB, 18 views)
File Type: jpg 03_SurfaceMesh-A-Pillar-zoom.jpg (180.2 KB, 15 views)
File Type: jpg 04_A-Pillar_Block.jpg (200.3 KB, 14 views)
File Type: jpg 05_AdvancingTRex-Front.jpg (204.8 KB, 15 views)

Last edited by NiklasH108; May 22, 2020 at 06:11.
NiklasH108 is offline   Reply With Quote


pointwise, 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
[Commercial meshers] Fluent3DMeshToFoam simvun OpenFOAM Meshing & Mesh Conversion 50 January 19, 2020 15:33
Natural convection in a closed domain STILL NEEDING help! Yr0gErG FLUENT 4 December 2, 2019 00:04
Turbulence model for free jet and wall jet Kostas_K FLUENT 2 March 31, 2017 05:49
IMPINGING JET ........... HELP!!!!!!!! Amir Omoumi Main CFD Forum 10 August 30, 1999 22:11
Wall functions Abhijit Tilak Main CFD Forum 6 February 5, 1999 01:16

All times are GMT -4. The time now is 07:58.