CFD Online Logo CFD Online URL
Home > Forums > FLUENT

solution is oscillating after 500 iterations

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

LinkBack Thread Tools Display Modes
Old   September 2, 2006, 01:00
Default solution is oscillating after 500 iterations
Swagata Bhaumik
Posts: n/a
I am an aerospace Engg student.I have to simulate flow past two buildings in tandem arrangement.i m using standard k-epsilon model.flow in coming in through one face where velocity-inlet condition is other 4 sides of the domain is specified as outflow the walls the standard wall function is activated.i have taken around 9 lakhs os hexahedral cells.the domain dimensions are 20x12x8.the building dimensions are 0.5x0.5x1 & 0.5x0.5x2.the under relaxation factors r 0.7 for pressure & 0.3 for momentum.i m using steady segregated solver for 3d. the problem is that after say 500 or 100 iterations the residuals start to oscillate & reverse flow through the outflow boundary takes place, though initially they monotonically decreases.can u suggest any remedy? Swagata
  Reply With Quote

Old   September 5, 2006, 00:27
Default Re: solution is oscillating after 500 iterations
Posts: n/a
Hi Swagata,

Rather than declaring outflow consider using pressure outlet. This should fix the problem.


  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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
icoLagrangianFoam OF1.6 myNewParticleSolver heavy_user OpenFOAM 16 February 11, 2012 06:15
alphaEqn.H in twoPhaseEulerFoam cheng1988sjtu OpenFOAM Bugs 14 September 18, 2011 13:46
lift and drag on ship superstructures vaina74 OpenFOAM Running, Solving & CFD 3 June 8, 2010 12:30
Tubrogrid - Error on cut-off at TE Flavio CFX 4 February 29, 2008 05:10

All times are GMT -4. The time now is 03:28.