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

oscillating pressure residuals buoyant plume

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

LinkBack Thread Tools Search this Thread Display Modes
Old   August 31, 2009, 06:31
Default oscillating pressure residuals buoyant plume
Senior Member
Aram Amouzandeh
Join Date: Mar 2009
Location: Vienna, Vienna, Austria
Posts: 190
Rep Power: 16
mabinty is on a distinguished road
Dear all!

I m simulating an isolated buoyant plume with chtMultiRegionFoam (for some preliminary studies of the solver). There, hot air (473 K) is entering a cooler environment (293 K) through the floor with an initial velocity of 0.8 m/s. Top and side boundaries are open (see attachment). I simulate one half of the set-up (due to symmetry) in 2D with a total simulation time of 600s. The standard k-eps turbulence model is used and settings for fvSchemes and fvSolution are taken from default.

When plotting residuals I cannot see pressure p converging, whereas those for h, k and eps do (see attachments). I ve already tried different combinations of BCs, always same behavior. Temporal evolutions of p, T and Uy at differnt locations are constant after at least 100s.

Can this simulation be considered as converged (I plan to use the results as initial field for further simulations) ???

I greatly appreciate your comments!!

Thanks in advance,
Attached Images
File Type: jpg residuals_hp.jpg (68.6 KB, 20 views)
File Type: jpg residuals_keps.jpg (38.4 KB, 21 views)
File Type: jpg buoyantPlume.jpg (20.9 KB, 20 views)
mabinty is offline   Reply With Quote


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
How to set oscillating pressure boundary condition acoustic ANSYS 1 August 30, 2009 23:16
pressure oscillating HSK CFX 0 July 21, 2008 12:08
Buoyant plume source Iona Evans CFX 0 February 27, 2008 08:29
turbulent buoyant plume Theo FLUENT 0 February 13, 2006 10:07
Hydrostatic pressure in 2-phase flow modeling (long) DS & HB Main CFD Forum 0 January 8, 2000 16:00

All times are GMT -4. The time now is 02:58.