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

Velocity Inlet

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 18, 2007, 17:56
Default Velocity Inlet
  #1
Hoshang Garda
Guest
 
Posts: n/a
I am using the velocity inlet boundary condition to initiate flow over a flat plate, and pick up viscous boundary layer effects. I set the velocity inlet to 60 m/s in the x-direction and 0 m/s in the y-direction. After the solution converges, I get 62.3 m/s in the x-direction as the free-stream velocity above the boundary layer.

Why is fluent not holding my boundary condition? Any insights into this matter would help...

  Reply With Quote

Old   April 19, 2007, 01:36
Default Re: Velocity Inlet
  #2
Razvan
Guest
 
Posts: n/a
The boundary layer is actually reducing the available cross-section for the fluid to pass over the flat plate, therefore a slight acceleration is occuring, so the mass conservation could be attained. To minimise this effect, simply move the upper boundary (usually "symmetry" type) further from the plate. You will immediately notice an improvement.

All the best,

Razvan
  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
Velocity Inlet BC -- Flow Reversal salihovic FLUENT 0 May 8, 2011 05:45
Changing Boundary: Decreasing Inlet Velocity - Convergence Issues VT_Bromley FLUENT 3 February 12, 2011 10:02
User Defined Profiles, Swirl, Velocity Inlet saurus FLUENT 0 January 26, 2011 16:35
Unexpected difference between velocity / mass-flow inlet jpo FLUENT 8 December 10, 2010 08:20
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 18:32.