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

[ICEM] 2d tri mesh prism layer

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 30, 2013, 18:07
Default 2d tri mesh prism layer
  #1
Senior Member
 
Francisco
Join Date: Mar 2012
Location: Spain
Posts: 270
Rep Power: 5
Bollonga is on a distinguished road
Hi everybody,

I'm dealing with a pretty simple 2d tri mesh but I'm not able to get a prism layer around the central geometry.

1) Could anybody tell me what I'm doing wrong?
2) As it's a 2D case, I guess I have to treat my iner fluid domain as volume mesh, right?
3) Which algorithm should I use Octree or Delaunay?

I attach case and geometry file. Thanks a lot!
Attached Images
File Type: jpg 2dtri.jpg (87.4 KB, 17 views)
Attached Files
File Type: zip Prueba2D.zip (7.2 KB, 0 views)
Bollonga is offline   Reply With Quote

Old   October 1, 2013, 09:24
Default
  #2
Senior Member
 
Francisco
Join Date: Mar 2012
Location: Spain
Posts: 270
Rep Power: 5
Bollonga is on a distinguished road
Searching a little more in the forum I've found two approaches to get a prism layer for a 2d tri mesh. I've tried both of them and none worked for me.
One approach is using the BLayer2D option in advanced prism meshing settings. The other is specifying the prism layers for the given curves. I describe here the steps I've followed for the 1st approach:

1 - Specify Global mesh parameters: global element scale factor and global element seed size.
2 - Set the Volume meshing parameters: mesh type (tetra/mixed) and mesh method (octree).
I've been using volume mesh parameters even if my domain is 2D, in the end I compute the volume mesh instead of a surface mesh. Should I use surface parameters and compute the surface mesh?
3 - Set prism layer parameters and enable the BLayer2D option in advacned prism meshing.
4 - Set the surface mesh maximun sizes.
5 - In Compute Mesh/prism mesh select the curve and surface in which the prism layer is to be created.
6 - In Compute mesh/volume mesh check the prism mesh box.
7 - Compute volume mesh.

As a result I get no prism layers in the selected curves.
Can anybody tell me what I'm doing wrong? Is there a step missing?
Can anybody tell me if I should work with surface rather than volume mesh for a 2d case?

Thanks a lot you guys!
Bollonga is offline   Reply With Quote

Old   October 1, 2013, 18:34
Default
  #3
Senior Member
 
Francisco
Join Date: Mar 2012
Location: Spain
Posts: 270
Rep Power: 5
Bollonga is on a distinguished road
I've tried to get a surface mesh instead of a volume one.

Setting the parameters to All tri, patch dependent gave horrible results.
All tri patch independent have given a nice mesh (picture 1), but if I try to get a prism layer (activating the BLayer2D option) it gives strange results:

1) Part of the mesh disappear (blue elements in picture 1 are missing in picture 2)
2) Some shell elements are spread in a normal plane (picture 2)
3) There is a 3D prism layer in a created material part (picture 3). Also there is the corresponding 2D quad layers.

How can I avoid missing all the shell elements and getting some of them in a normal plane?

Any comment will be highly appreaciated.

I attach case and tin file.
Attached Images
File Type: jpg all_tri_patch_indep.jpg (88.5 KB, 9 views)
File Type: jpg all_tri_patch_indep_prism_layer.jpg (47.6 KB, 7 views)
File Type: jpg all_tri_patch_indep_prism_layer_vol.jpg (48.3 KB, 9 views)
Attached Files
File Type: zip Prueba2D_surface_mesh.zip (7.5 KB, 0 views)
Bollonga is offline   Reply With Quote

Reply

Tags
prism layers, tri mesh, unstructured mesh

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
[ICEM] How can I create prism mesh for a 3D domain surrounded by a torus? lzgwhy ANSYS Meshing & Geometry 3 September 18, 2012 22:04
Layers don't fully surround surface EVBUCF OpenFOAM Native Meshers: snappyHexMesh and Others 14 August 20, 2012 05:31
[ICEM] collapsed tri after prism mesh skrzatchlewny ANSYS Meshing & Geometry 0 January 20, 2012 05:08
Getting prism to inflate into mixed tet-hex meshes Joe CFX 16 October 10, 2011 08:06
snappy hangs while layer generation bastil OpenFOAM Native Meshers: snappyHexMesh and Others 3 October 29, 2010 08:19


All times are GMT -4. The time now is 02:37.