CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Meshing & Mesh Conversion

Velocity "ripples" at AMI

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 17, 2013, 13:34
Default Velocity "ripples" at AMI
  #1
Senior Member
 
Pete Bachant
Join Date: Jun 2012
Location: NH, USA
Posts: 107
Rep Power: 5
pbachant is on a distinguished road
I'm getting what looks like ripples at the AMI in my 2D mesh after using snappyHexMesh. The meshing dicts are based on those by another forum member Boloar. When I mesh that case, there is no rippling, but when I insert my own geometry (including a smaller cylinder as the AMI surface), I get these ripples. I have meshed with many different refinement levels, iteration numbers, etc., but still the same. Anyone have an idea on what parameter would cause these ripples?
Attached Images
File Type: jpg rough_AMI.jpg (12.7 KB, 22 views)
pbachant is offline   Reply With Quote

Old   October 18, 2013, 05:56
Default
  #2
Senior Member
 
Artur's Avatar
 
Artur
Join Date: May 2013
Location: Southampton, UK
Posts: 226
Rep Power: 6
Artur is on a distinguished road
I have seen this in my cases as well. I think it arises due to interpolation errors at the AMI interface. I am not sure, however, if it's a problem with the AMI itself or perhaps the way paraview visualises the data?
Artur is offline   Reply With Quote

Old   October 18, 2013, 13:52
Default
  #3
Senior Member
 
Pete Bachant
Join Date: Jun 2012
Location: NH, USA
Posts: 107
Rep Power: 5
pbachant is on a distinguished road
Yeah, I think it's just ParaView's interpolation. If you turn interpolation off and use cell values it looks uniform.
pbachant 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
Plotting Radial Velocity and Tangential Velocity in CFD Post ashtonJ CFX 5 July 13, 2015 02:49
Velocity in Porous medium : HELP! HELP! HELP! Kali Sanjay Phoenics 0 November 6, 2006 07:10
Neumann pressure BC and velocity field Antech Main CFD Forum 0 April 25, 2006 02:15
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11
what the result is negatif pressure at inlet chong chee nan FLUENT 0 December 29, 2001 06:13


All times are GMT -4. The time now is 19:07.