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

outlet boudary condition for a flow in the pipe

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 28, 2004, 08:08
Default outlet boudary condition for a flow in the pipe
  #1
Atit
Guest
 
Posts: n/a
I would like to simulate the flow in a circular pipe with a turbine in the pipe. [ I did not model the streamline disturbance by the turbine, I model the turbine as the subdomain with a momentum sink] I specify the inlet boundary condition of the pipe as "Inlet" with a given x-component velocity. For an outlet boundary condition, I think I should specify "Outlet" with an x-component velocity as v2 = rho1*v1/rho2. This v2 comes from the continuity equation for 1D flow. However I saw that in the tutorial about "flow through a butterfly valve" and "flow in a catalytic converter" of CFX, they are all specified the zero relative pressure as the outlet boundary condition. 1. I was wondering about zero relative pressure that when do we use this boundary condition? Should I use it in my case? 2. In "flow in a catalytic converter", I note that it's emphasized that the outlet boundary condition must be static pressure, not average static pressure. Do anyone know why? Thank you very much.

Atit
  Reply With Quote

Old   October 31, 2004, 14:11
Default Re: outlet boudary condition for a flow in the pip
  #2
Atit
Guest
 
Posts: n/a
In additon, when I set zero total pressure at the inlet of the pipe, what does it mean? When should we use this condition? Thank you.

Atit Koonsrisuk
  Reply With Quote

Old   November 9, 2004, 18:43
Default Re: outlet boudary condition for a flow in the pip
  #3
KKA
Guest
 
Posts: n/a
all the boundary conditions and their meanings have been documented in the USER MANUAL. Please refer to them!!

regards!!
  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
Disturbed flow field at outlet boundary (Multiphase flow through pipe) Michiel CFX 17 April 21, 2010 11:14
VOF Outlet boundary condition in cfd - ace JM Main CFD Forum 0 December 15, 2006 09:07
Outlet boundary condition in channel flow solving with interFoam liuzhw OpenFOAM Running, Solving & CFD 0 November 29, 2005 22:07
Outlet Boudary Condition for Fully Developed Flow Saad Main CFD Forum 5 November 19, 2004 14:22
Outlet boundary condition for pulsatile flow Timite FLUENT 0 January 22, 2003 04:56


All times are GMT -4. The time now is 14:02.