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

flow in pipe

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 4, 2003, 23:05
Default flow in pipe
  #1
co2
Guest
 
Posts: n/a
I have a simple pipe flow and I am trying to get the fully developed profile for both velocity and temperature. Hence I have modeled it to be long about 50 times the diameter. But I am not sure what inlet and outlet BC combinations I should be using.

Do I use Velocity inlet + pressure-outlet?

OR

Mass-flow inlet + pressure-outlet?

Please let me know
  Reply With Quote

Old   December 5, 2003, 04:29
Default Re: flow in pipe
  #2
ccc
Guest
 
Posts: n/a
hi co2,

How about the compressibility of the fluid in your case? In general, velocity inlet is adopted for incompressible one and mass-flow for compressible one, especially ideal gas.

good luck.

  Reply With Quote

Old   December 5, 2003, 11:54
Default Re: flow in pipe
  #3
co2
Guest
 
Posts: n/a
I dont worry about the variation in rho. it is water. so I guess vel inlet is taken care of. what about the outlet? it is pressure outlet or outflow?
  Reply With Quote

Old   December 5, 2003, 13:18
Default Re: flow in pipe
  #4
ap
Guest
 
Posts: n/a
Velocity inlet is the appropriate BC for your case (incompressible fluid).

For the outlet, if you know the pressure at the outlet, use a pressure-outlet BC. If you don't know it, switch to Outflow BC.

You want to model a fully developed flow, so Outflow can be a good choice.

Hi

ap
  Reply With Quote

Old   December 6, 2003, 11:22
Default Re: flow in pipe
  #5
ccc
Guest
 
Posts: n/a
hi co2,

I agree with ap.

good luck.

  Reply With Quote

Old   December 21, 2003, 19:39
Default Re: flow in pipe
  #6
chandra
Guest
 
Posts: n/a
i think no neccesary to doubt vel inlet or mass inlet, it depend to the fluid properties, it is not the must to make vel in let for incompressible,
  Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
LES transitional pipe entrance flow hasanduz Main CFD Forum 2 October 11, 2013 18:59
HTC in Pipe flow subsemitonium CFX 6 May 6, 2013 23:00
[GAMBIT] meshing in GAMBIT, a flow through a pipe having complex inflow geometry mazhar1613 ANSYS Meshing & Geometry 1 January 12, 2012 00:18
[ASK] Flow in Corrugated Pipe with FLUENT Primadhani FLUENT 1 May 11, 2011 21:41
Pipe Flow Saima CFX 1 January 10, 2011 17:41


All times are GMT -4. The time now is 00:40.