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

[TGrid] Tgrid hybrid mesh pyramid transition

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   November 24, 2009, 19:25
Default Tgrid hybrid mesh pyramid transition
  #1
New Member
 
Join Date: Nov 2009
Posts: 22
Rep Power: 16
tony00 is on a distinguished road
Hi,
i am using Tgrid to mesh a volume. These are the steps:
1)I am growing prisms on some faces wihch originally have quad surface mesh.
2) After I create the prisms I create&activate a new domain by selecting the prisms caps and the remaining faces.
3) I will mesh this with tetra. I select pyramid as transition elements before meshing the domain.
4) I mesh with tetra.
When I run the simulation in Fluent the prisms are disconnected from the tetra mesh and no flow goes through.

Back to Tgrid I tried to merge the volume domains (prisms and tetra) but I could only see one domain.

Could anyone see what I am missing? I checked the tutorial on hybrid mesh in Tgrid and do not spot where the problem is.

Thank you
regards
tony00 is offline   Reply With Quote

Old   November 25, 2009, 02:07
Default
  #2
Member
 
Join Date: Mar 2009
Posts: 32
Rep Power: 17
udayrg is on a distinguished road
Hi

Tony00

Well to find out whether the prism layer and the tet domain share a common face. Do as follows

1) Select a node on the prism cap set range to 1 and compute in display grid bounds options.

2) In display grids face option put option all

3) In Attributes display face edges filled you will certainly get if you have two or single face between Prism and tet zones.

If you are advanced user i would say, In simple look for a c/s of the Surface mesh.


Now if the there exist only one surface. You need to merge the prism and tet zones in tgrid and change the prism cap to interior, merge the prism side with adjoining surface. In Fluent it will seperate the zone with connectivity and boundary conditions applied in preprocessor.

try it and let me know if it works

Apart from it if you have two surfaces one with prism and one with tet zone you need to remesh.
udayrg is offline   Reply With Quote

Old   November 25, 2009, 06:07
Default Tgrid hybrid mesh
  #3
New Member
 
Join Date: Nov 2009
Posts: 22
Rep Power: 16
tony00 is on a distinguished road
Hi udayrg
thanks for the reply. It looks like I have two faces so i need to remesh.
Now the question is:
what i am doing wrong in my meshing steps?
How do I generate prisms, pyramids and tetrahedrons which are connected?

Thansk
Tony
tony00 is offline   Reply With Quote

Old   November 26, 2009, 02:38
Default
  #4
Member
 
Join Date: Mar 2009
Posts: 32
Rep Power: 17
udayrg is on a distinguished road
Hi Tony00

You can proceed step by step

1) Develop prism layers

2) On the the prism cap generate pyramid manually i.e. without automesh option

3) Create a domain with the pyramid cap and remaining surface for tet. generation.


4) Merge the prism, pyramid and tet zones in one zone.

5) Merge the prism side in the adjoining surface zone and either you can merge the prism cap and pyramid cap in fluid interior or just apply interior boundary condition.


This will certainly work until and unless you do not have any skewness issue on pyramid transition.
udayrg is offline   Reply With Quote

Old   November 26, 2009, 05:36
Default Prism cap from wall to internal
  #5
New Member
 
Join Date: Nov 2009
Posts: 22
Rep Power: 16
tony00 is on a distinguished road
Hi,
it does work now with your steps! I also had to change the prism cap from wall to internal. As the wall was stopping the flow.
The commands were:
boundary->manage->change type.

Thank you very much for your help
Tony
tony00 is offline   Reply With Quote

Reply

Tags
hybrid mesh, prisms, pyramids, tgrid, transition

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
zonal hybrid mesh Maolin Tu Main CFD Forum 5 May 16, 2020 13:19
[snappyHexMesh] SnappyHexMesh for internal Flow vishwa OpenFOAM Meshing & Mesh Conversion 24 June 27, 2016 09:54
[Other] Hybrid mesh with GRIDGEN famarcfd ANSYS Meshing & Geometry 2 November 2, 2009 11:53
Hybrid Mesh Marc FLUENT 4 July 18, 2007 21:38
Mesh Mignard FLUENT 2 March 22, 2000 06:12


All times are GMT -4. The time now is 06:50.