CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

2D MESH

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 23, 2006, 05:50
Default 2D MESH
  #1
actone
Guest
 
Posts: n/a
Hi i'm working on a 2D mesh and i wonder if the size of the extruded 2D mesh is important or not.

thanks in advance.
  Reply With Quote

Old   October 23, 2006, 14:23
Default Re: 2D MESH
  #2
Camilo Costa
Guest
 
Posts: n/a
GENERALLY, THE DISTANCE OF SIMETRY FACES ARE THE SAME LENGHT OF YOUR SMALL VOLUME MESH!!
  Reply With Quote

Old   October 24, 2006, 04:51
Default Re: 2D MESH
  #3
actone
Guest
 
Posts: n/a
thanks Camilo

my smallest volume is about 3e-3mm (my Re is 1.2e-6 so i need a very small first layer in my BL). isn't it too small? (the geometry is 150mm long) i've made an unsteady computation with 1mm of thickness and it seems to become 3D (that was the reason my question in fact, when i look at the pressure at the two periodic faces, it's the same at the beginning and then it become very different )

note: i extrude 1 layer thinck in CFX mesh with extruded periodic pair, then i set two symetry BC in CFX pre. is that right?

  Reply With Quote

Old   October 24, 2006, 13:56
Default Re: 2D MESH
  #4
Camilo Costa
Guest
 
Posts: n/a
I think no, but a problem that you can have is, if you use a ICEM for construction your mesh, when you import your geometry same lines and points can disappear. This is a bug of program!! For solution this construct your geometry in ICEM, is a shit, but work.

If you use CFX mesh you donīt have problem, but icem is more difficult to use for construction.
  Reply With Quote

Old   October 26, 2006, 21:55
Default Re: 2D MESH
  #5
TB
Guest
 
Posts: n/a
CFX thought is to treat ICEM as a meshing tool, I think. Load your model into the workbench, and modify from there. Lots of powerful solid modelling software are now available on the market.

CFX mesh doesn't offer hex mesh tool, if my information is still valid. For a simple 2D problem, I will suggest the use of hex mesh.
  Reply With Quote

Old   October 27, 2006, 09:59
Default Re: 2D MESH
  #6
Robin
Guest
 
Posts: n/a
CFX-Mesh does have a pseudo 2D meshing option which will output one or multiple layers. In CFX-Mesh, go to Model>Mesh>Options and switch Meshing Strategy from Advancing Front and Inflation to Extruded 2D Mesh.

Once you have made this change, the Periodicity object will disappear and be replaced by the Extruded Periodic Pair object. Pick the start and end faces of your geometry as the periodic pair. If the geometry is axisymmetric you must also include the axis of rotation. Change periodic type to Rotational and select or edit(by right clicking on Point) the two points that define your axis.

2D Extrusion Option = Full will extrude the face mesh through your entire model and divid it into the specified number of layers.

2D Extrusion Option = Partial will extrude the mesh one layer and automatically calculate the thickness based on your mesh size to be optimum for the solver.

The final mesh will be a combination of hexes (at inflation layers) and prisms, both of which are good for 2D simulations.

Regards, Robin
  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
[ICEM] surface mesh merging problem everest ANSYS Meshing & Geometry 39 June 5, 2013 19:02
snappyHexMesh won't work - zeros everywhere! sc298 OpenFOAM Native Meshers: snappyHexMesh and Others 2 March 27, 2011 21:11
Meshing aifoil in ICEM student123a ANSYS Meshing & Geometry 13 December 8, 2010 11:40
mesh missing after export in gambit morteza08 ANSYS Meshing & Geometry 1 July 26, 2010 01:10
2d irregular grid Remy Main CFD Forum 1 December 22, 2008 05:49


All times are GMT -4. The time now is 12:16.