CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Simple steady incompressible pressureInlet flow does not converge

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

LinkBack Thread Tools Display Modes
Old   April 3, 2006, 13:29
Default Hi everybody.... i'm trying to
New Member
Alessio V
Join Date: Mar 2009
Posts: 7
Rep Power: 10
adamsview is on a distinguished road
Hi everybody.... i'm trying to solve s "simple" pressure-pressure case of a incompressible newtonian liquid flow in a 3D domain. I'm using simpleFoam with pressureInlet and pressureOutlet. The problem is that i really can't reach any kind of seems OpenFOAM can't initialize the U field. I have really strange outflows with very high velocity (e+6,e+7) after just 1 step (and increasing it going on)!!
I'm using a pressure of 413 at inlet (2.8 bar divided by 678 kg/m3), 0 at outlet and epsilon=0.02 and should give a velocity, close to the inlet, of about 0.09 m/s!!!
I've tried with a potential case first, to initialize...but not results are reached. I would like to try with a boundaryFoam too...but it is like it doesn't exist!!
Can anyone help me????

P.S.: i've decreased relaxiation factors and i'm using most upwind schemes. I've played increasing and decreasing by 1 or 2 orders the tolerances too....but nothing seems to become better....
adamsview is offline   Reply With Quote

Old   April 3, 2006, 14:37
Default hello! Im a beginner at OpenFO
Posts: n/a
hello! Im a beginner at OpenFOAM but I got a familiar (unreasonable high) answer when i had mixed up my patches for inlet and outlet i.e. i got correct results when selecting my U negetiv at the inlet.

just an idea
  Reply With Quote

Old   April 4, 2006, 02:47
Default well....i can't know exact val
New Member
Alessio V
Join Date: Mar 2009
Posts: 7
Rep Power: 10
adamsview is on a distinguished road
well....i can't know exact values of velocity at every inlet node.... it should be calculated by the pressure exact value i'm imposing. I'll try to use an initialization of U at inlet with negative values following your idea, but i really would like to know HOW OpenFOAM initializes U field at pressureInlet boundary!
adamsview is offline   Reply With Quote

Old   June 6, 2006, 09:04
Default Hi, I'm another new user of
New Member
Greg Zink
Join Date: Mar 2009
Location: Ames, Iowa, USA
Posts: 16
Rep Power: 10
gzink is on a distinguished road

I'm another new user of OpenFoam, seeing a similar problem. I am running an inviscid pipe flow with pressure bounds and my velocity keeps increasing as I iterate. It works with inlet, specifying a velocity, but I can't get it with pressureinlet. Any ideas?

Greg Z.
gzink is offline   Reply With Quote


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
Steady state incompressible flow Bharat Rangan (Rangan) OpenFOAM Running, Solving & CFD 10 November 22, 2010 16:21
An FASMultigrid solver for steady incompressible viscous flow luca_g OpenFOAM Running, Solving & CFD 3 September 21, 2009 02:30
Steady incompressible laminar flow using simpleFoam yongshenglian OpenFOAM Running, Solving & CFD 0 October 29, 2008 16:28
internal steady incompressible inviscid fluid flow Nina Shokina Main CFD Forum 0 October 21, 2003 06:11
incompressible steady flow john Main CFD Forum 0 May 9, 2003 08:24

All times are GMT -4. The time now is 17:14.