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

Wall boundary condition (a very simple question)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 6, 2010, 12:37
Default Wall boundary condition (a very simple question)
  #1
New Member
 
Safa van Jansen
Join Date: Aug 2010
Posts: 2
Rep Power: 0
safa_c is on a distinguished road
Dear all,

I am a beginner in FLUENT and my apology for this simple question. I would appreciate your explanation.

I am using FLUENT in order to simulate natural convection in a room. All my boundary conditions are specified as wall. In pre-processing I assigned different uniform temperatures to all wall surfaces. But after the simulation is finished, when I check the surface temperature of the walls, I do not have uniform temperatures at the walls that I assigned.

Shouldn't the wall boundary conditions remain fixed and unchanged during the CFD iterations?

Why do the uniform wall surface temperature before the simulation change to non-uniform wall surface temperature after the simulation?


Thanks a lot for your explanation,
Safa van Jansen
safa_c is offline   Reply With Quote

Old   August 15, 2010, 05:05
Default
  #2
Senior Member
 
xrs333
Join Date: Aug 2010
Posts: 125
Rep Power: 7
xrs333 is on a distinguished road
Hello, Safa,
two reasons: one is because of different temperature of the walls, the temperature at the intersect line of two walls is blend of temperatures on them. The other is that you displayed cell value for the temperature, which is actually the value in the cell adjacent to the wall. To display the wall temperature, use Wall Temperature(Outer Surface) under Contours of pulldown list.
xrs333 is offline   Reply With Quote

Reply

Tags
wall boundary conditions

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
no-slip wall boundary condition Atit Koonsrisuk CFX 3 July 10, 2014 17:10
thermal boundary condition at coupled wall gokul patil FLUENT 2 June 19, 2014 05:07
how to set up a wall boundary condition according to calculated wall shear stress? gameoverli OpenFOAM Pre-Processing 1 May 21, 2009 08:28
CFX Solver : Sudden crash Hervé CFX 2 June 16, 2008 06:40
pressure boundary condition on the wall fluideniro Main CFD Forum 12 December 24, 2003 02:10


All times are GMT -4. The time now is 12:29.