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

[ANSYS Meshing] 2D rectangular cylinder using cutcell

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 7, 2013, 11:26
Default 2D rectangular cylinder using cutcell
  #1
New Member
 
Sindre
Join Date: Oct 2013
Posts: 12
Rep Power: 4
sindre is on a distinguished road
Hi all,
I'm trying to make a 2d mesh of a rectangular cylinder. I've been trying to create a mesh that is fine close to the boundary. I've therefore tried to use cutcell, but I have met some problems:
I got an error message using cutcell for a 2D geometry, but works fine for 3D (used extrude in DesignModeller). Which is ok as long as I only have one cell in the z-direction. Does anyone know how to fix the number of cells in one direction?

Is there a way to get the fine mesh only around the cylinder (not the outer edges/faces)?
Feel free to add own suggestions/thoughts

Much appreciated
Sindre
Attached Images
File Type: jpg Capture4.jpg (34.5 KB, 34 views)
File Type: jpg Capture3.jpg (69.4 KB, 33 views)
File Type: png Capture2.PNG (27.2 KB, 43 views)
sindre is offline   Reply With Quote

Old   November 8, 2013, 03:55
Default
  #2
Member
 
vidyanand
Join Date: Nov 2011
Location: bangalore,india
Posts: 66
Rep Power: 9
Vidyanand Kesti is on a distinguished road
activate the inflation layer in meshing option or assign the body sizing
Vidyanand Kesti is offline   Reply With Quote

Old   November 8, 2013, 05:16
Default
  #3
New Member
 
Sindre
Join Date: Oct 2013
Posts: 12
Rep Power: 4
sindre is on a distinguished road
Hi Vidyanand,
Thank you for a quick response

I have been trying to assign edge/face sizing. My logic says that I can remove the elements in z-direction by adding a face size and choose an element size equal to the depth. And that I can use edge sizing to remove the small cells along the outer boundary in the XY-plane. So far without any luck. I'll try using inflation and keep try to use sizing
sindre is offline   Reply With Quote

Old   November 11, 2013, 09:53
Default
  #4
New Member
 
Sindre
Join Date: Oct 2013
Posts: 12
Rep Power: 4
sindre is on a distinguished road
I finally managed to get a fine mesh around the cylinder using CutCell I made a box in desingmodeler (Create > Primitives > Box) and then defined the fluid around using Enclosure (Tools > Enclosure) and then used CutCell on Proximity - Faces.

My only problem now is to make it 2D (or to only have one element in the z-direction). The help file states that:
Quote:
The CutCell method uses a patch independent volume meshing approach (surface mesh automatically created from boundary of volume mesh) [...]
Does anyone know how to create/get the surface mesh?
sindre is offline   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
Flow over a rectangular cylinder CD too low lee557 FLUENT 0 March 2, 2011 14:55
Incompressible flow past a 2D rectangular cylinder Niru Main CFD Forum 5 February 8, 2011 05:20
Specifying boundary faces failes in blockMesh blaise OpenFOAM Meshing & Mesh Conversion 0 May 10, 2010 03:56
Cd values for 3D rectangular cylinder karthik FLUENT 1 August 28, 2009 06:32
Drag coefficient for 3D rectangular cylinder karthik Main CFD Forum 3 September 29, 2005 14:18


All times are GMT -4. The time now is 15:52.