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

External Natural Convetion

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 23, 2005, 08:32
Default External Natural Convetion
  #1
Mohamad Ayoub
Guest
 
Posts: n/a
I am trying to simulate external natural convection (Infinite domain). I do not know what are the suitable boundary conditions. I have tried the pressure inlet and outlet boundary conditions, but the velocity boudary layer seems to be larger than expected. Please, can anybody help me in this?
  Reply With Quote

Old   September 23, 2005, 12:56
Default Re: External Natural Convetion
  #2
Evan Rosenbaum
Guest
 
Posts: n/a
Pressure inlet and outlet is the way to go. The unexpected boundary layer thickness probably has more to do with your turbulence modeling or something like that.
  Reply With Quote

Old   September 23, 2005, 17:15
Default Re: External Natural Convetion
  #3
Vinod Dhiman
Guest
 
Posts: n/a
Hi

Yes pressure conditions are very well. But at the inlet, you probably be knowing the pressure, and at the other ends you have to take atmospheric pressure condition and that's too far away from you domain, p reaches atmospheric far away from wall. So, you have to create your domain bigger than original domain, in the direction where you are giving this boundary condition, eg., you can specify it far downstream.

Vinod Dhiman
  Reply With Quote

Old   September 24, 2005, 12:59
Default Re: External Natural Convetion
  #4
Mohamad Ayoub
Guest
 
Posts: n/a
Thanks alot for your response. If I am simulating an infinite domain, can I put the inlet and outlet pressure conditions to be zero? If not what is a logical value for inlet pressure that doesnot affect the solution?

Thanks very much for your help
  Reply With Quote

Old   September 26, 2005, 15:27
Default Re: External Natural Convetion
  #5
Evan Rosenbaum
Guest
 
Posts: n/a
Inlet and outlet pressure conditions can both be zero. FLUENT will account for elevation automatically.
  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
CGNS Compiling Diego Main CFD Forum 17 December 21, 2014 02:40
Natural convection in a closed domain STILL NEEDING help! Yr0gErG FLUENT 3 June 12, 2013 02:12
natural convection problem with radiation jorien CFX 0 October 14, 2011 09:26
Update boundary conditions calculated by an external program CedricVH OpenFOAM 2 January 15, 2010 12:55


All times are GMT -4. The time now is 03:16.