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

free convection

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 6, 2008, 06:19
Default free convection
  #1
venkat
Guest
 
Posts: n/a
hi all, here is a simple textbook problem: "free convection(of air) on a vertical flat plate"...

my approach: plate is at a uniform temperature 0f 100 deg c. i have taken a rectangular domain surrounding one side of the plate. one boundary condition is clear i.e plate at uniform temperature. Apart from this, i know only air temperature when it is still. now, i want to know how can i apply other boundary conditions.

Am i clear?
  Reply With Quote

Old   November 6, 2008, 11:47
Default Re: free convection
  #2
Wiebe
Guest
 
Posts: n/a
Hello Venkat,

You will have to decide how you want to reach that average temperature. A "classic textbook problem" would be to set the temperature of the opposite wall to a lower temperature (top and bottom adiabatic).

Good luck, Wiebe.
  Reply With Quote

Old   November 7, 2008, 06:15
Default Re: free convection
  #3
venkat
Guest
 
Posts: n/a
Hi i am sorry....could u be more clear on that plz? thanks

  Reply With Quote

Old   November 7, 2008, 08:49
Default Re: free convection
  #4
Amod
Guest
 
Posts: n/a
Which software are you going to use?

In CFX, you will have to set Inlet and "Outlet/Opening" B.C. For buoyancy-driven flow, you need to set the reference density or reference temperature. Try to set reference density as per solver recommendation (I guess it is the lowest density that can occur at a point inside the domain).

However, the most important is to set the pressure at the lower face! The hydrostatic presssure equivalent to (rho*g*h) should be set at the lower face!

|A|
  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
Free Stream Temperature in natural convection problem tomcatbobby FLUENT 2 January 27, 2011 06:41
URGENT!!!! Combined free convection Mahyar FLUENT 0 August 13, 2008 00:39
CFX-5.5 simulating air free convection Dustin Lee CFX 0 April 16, 2003 02:54
Free Convection in STAR-CD George Hampel CD-adapco 0 November 16, 2000 00:38
free convection heat transfer from a heated horizontal surface through a liquid to a thin cooled fin Kaushik FLUENT 1 May 8, 2000 06:47


All times are GMT -4. The time now is 13:31.