# Poiseuille flow problem

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

 December 5, 2002, 19:44 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.

 December 6, 2002, 17:52 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

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post andrenonaka CFX 6 December 4, 2014 04:57 vlnikolic Main CFD Forum 0 December 4, 2010 12:02 ziemowitzima OpenFOAM Running, Solving & CFD 0 April 5, 2010 13:30 nikhil FLUENT 0 March 29, 2010 23:52 jehanzeb FLUENT 5 August 3, 2004 08:04

All times are GMT -4. The time now is 21:04.