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

Poiseuille flow problem

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 5, 2002, 19:44
Default Poiseuille flow problem
  #1
Rosie
Guest
 
Posts: n/a
Warning: this probably sounds like a dumb question

I have tried to reproduce the classic problem of flow through a tube in fluent. It works with pressure boundary conditions, but I want to prescribe a velocity boundary condition instead (and solve for the pressure gradient needed to produce laminar flow). How do I get the theoretical solution using this boundary condition? When I run the solution this way, the velocity profile never reaches a truly parabolic shape - it looks like plug or turbulent flow. I have already accounted for the transition to fully developed flow - the fully developed solution is not parabolic.

The reason I want to know how to do this is that I have some problems for branched tubes I want to solve using a velocity boundary condition. I am trying to reassure myself that I understand the physics of the way Fluent is solving the problem of straight tube flow before I solve a problem that has no analytical solution. Thanks.
  Reply With Quote

Old   December 6, 2002, 17:52
Default Re: Poiseuille flow problem
  #2
lagha
Guest
 
Posts: n/a
Dear Rosy, it's a good idea to start using fluent with some basic flow. When I started with fluent three years ago, I have tried to solve the same problem as you. And I think that the mistakes was the reynolds number; I had a turbulent flow with a number of reynolds over 5000. I think that this is your problem... (for the pressure don't change any thing, just put your right velocity in the inlet and no thing in the outlet...) goog luck lagha
  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
flow past abdominal aorta. Complex BC problem. ziemowitzima OpenFOAM Running, Solving & CFD 1 July 26, 2022 06:12
basic fluid flow problem - is there a way to switch pressure to a flow rate in analyt vlnikolic Main CFD Forum 3 September 16, 2016 05:07
Domain format problem on airfoil flow simulation andrenonaka CFX 14 December 7, 2015 01:42
Axisymmetric Vs 2D Flow problem nikhil FLUENT 0 March 30, 2010 00:52
transient compressible flow problem (urgent plz) jehanzeb FLUENT 5 August 3, 2004 09:04


All times are GMT -4. The time now is 01:47.