CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

buoyantSimpleFoam with LaunderSharmaKE

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 14, 2009, 04:59
Default buoyantSimpleFoam with LaunderSharmaKE
  #1
Member
 
Marco Müller
Join Date: Mar 2009
Location: Germany
Posts: 94
Rep Power: 9
marico is on a distinguished road
Hi All,

I'm trying to simulate the case described here:

http://cfd.mace.manchester.ac.uk/cgi...&0&0&0&unknown



The W direction is resolved with 6 elements.
The solution progresses well except of Turbulence equations!! Residuals
there stick at 0.1-0.4... (Low-Re has to be used!!?)
The result is that velocities are much too small (~0.3 mm/s), but qualitatively right. Heat Transfer is without convection...
Turbulence quantities have zeroGradient BC's, for "p" and "pd" I wasn't sure what to use. Currently it is "wallBuoyantPressure, uniform 1 bar" for p (calculated, uniform 1 bar" gave same results) and "fixedFluxBuoyantPressure, uniform 0" for pd!

Any suggestions?
Is there any other solver/turbulence model for that problem??

Thanks in advance

Marco
marico is offline   Reply With Quote

Old   April 16, 2009, 01:53
Default
  #2
Member
 
Marco Müller
Join Date: Mar 2009
Location: Germany
Posts: 94
Rep Power: 9
marico is on a distinguished road
Ok, some update:

with 1e-10 for BC values for turbulence quantities it converges better, but the flow is even slower!!

Marco
marico is offline   Reply With Quote

Old   April 21, 2009, 06:17
Default Update
  #3
Member
 
Marco Müller
Join Date: Mar 2009
Location: Germany
Posts: 94
Rep Power: 9
marico is on a distinguished road
Hi again,

I hope that someone can help. First of all, I made a failure in mesh: The thin direction now is resolved with 150 cells (LowRE), the height is 250 cells and the third direction 5 cells. That sounds stupid, but for CFX (sorry) it works perfect and some professionals (Menter..) chose an even worser resolution...
Here are the compared results:
bild.png

(CFX results with SST model)
As you can see, the results are the same for 50% height and 10% height with OpenFOAM. The flow is too slow, turbulence switched of seems to change nothing...

Here is the case:
BuoyantCavity.tar.gz

Thanks for your help

Marco
marico is offline   Reply With Quote

Reply

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
BuoyantSimpleFoam tutorial error erydj OpenFOAM Installation 2 June 23, 2011 05:46
BuoyantSimpleFoam amitshah OpenFOAM Running, Solving & CFD 4 June 3, 2009 06:04
buoyantSimpleFoam Message error Khelian973 OpenFOAM Running, Solving & CFD 8 June 2, 2009 13:26
buoyantSimpleFoam error message Khelian973 OpenFOAM Running, Solving & CFD 4 April 16, 2009 04:45
BuoyantSimpleFoam Channel problem prashant24983 OpenFOAM Running, Solving & CFD 7 September 18, 2008 04:50


All times are GMT -4. The time now is 19:01.