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

Normal velocity at the symmetry boundary

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

Reply
 
LinkBack Thread Tools Display Modes
Old   October 20, 2009, 12:38
Default Normal velocity at the symmetry boundary
  #1
New Member
 
Join Date: Oct 2009
Posts: 1
Rep Power: 0
Seventy is on a distinguished road
Hi, I am new to Fluent but have some background on fluid mechanics. I notice a problem in Fluent and don't know how to explain it. I have a 3D k-e model with a symmetry boundary. The velocity normal to this boundary should be zero according to the definition of symmetry, but the converged solution shows none-zero normal velocity exists on this surface. A similar case is the OUTFLOW boundary. By definition, OUTFLOW boundary should have zero normal flux, but I observed none-zero normal velocity gradient in a contour plot on the surface. Could anyone explain the reason please?

regards,
Steve
Seventy is offline   Reply With Quote

Old   October 26, 2009, 07:52
Default
  #2
Member
 
Krishna
Join Date: Oct 2009
Posts: 34
Rep Power: 7
t.krishnamohan is on a distinguished road
Steve,

When a boundary is defined as symmetric, the gradients of all the properties normal to it will be zero. You are misunderstanding the properties with its gradients.
t.krishnamohan 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
Wind turbine simulation Saturn CFX 34 October 16, 2014 05:27
Opening BC: Normal to boundary Jan Ramboer CFX 3 September 21, 2007 15:06
The behavior of droplets at the symmetry boundary SJLee CD-adapco 0 April 17, 2007 01:50
Trimmed cell and embedded refinement mesh conversion issues michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15
Terrible Mistake In Fluid Dynamics History Abhi Main CFD Forum 12 July 8, 2002 09:11


All times are GMT -4. The time now is 07:31.