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

PISO in FLUENT vs. OpenFOAM

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

Like Tree1Likes
  • 1 Post By Industrial_CFD

Reply
 
LinkBack Thread Tools Display Modes
Old   February 4, 2013, 21:40
Default PISO in FLUENT vs. OpenFOAM
  #1
Member
 
Anonymous
Join Date: Jan 2012
Location: Canada
Posts: 49
Rep Power: 5
Industrial_CFD is on a distinguished road
Hi guys,

I am trying to get an LES case set up in openfoam, and I have been trouble shooting with FLUENT. FLUENT iterates PISO until the specified max iterations are reached ( or until convergence). Is there anyway to run pisoFOAM like this? Would this implementation be pimpleFoam?

Cheers
Ahmed Gohar likes this.
Industrial_CFD is offline   Reply With Quote

Old   February 5, 2013, 10:43
Default
  #2
Senior Member
 
Christian Lucas
Join Date: Aug 2009
Location: Braunschweig, Germany
Posts: 198
Rep Power: 8
Chris Lucas is on a distinguished road
Hi,

have a look at pimpleFoam. However, as I know, pimpleFoam doesn't check if the solution is converged. You have to programm it (a guess 10 lines of code) yourself.

Kind Regards,
Christian
Chris Lucas is offline   Reply With Quote

Old   February 7, 2013, 11:14
Default Update
  #3
Member
 
Anonymous
Join Date: Jan 2012
Location: Canada
Posts: 49
Rep Power: 5
Industrial_CFD is on a distinguished road
What is really amazing is that OpenFOAM won't converge compared to the same settings in FLUENT (I think anyway). FLUENT handles the case easily, whereas OpenFOAM cannot converge the pressure term.
It is really strange. I'm starting to wonder if it is a bug or something.
Industrial_CFD is offline   Reply With Quote

Old   February 11, 2013, 06:43
Default
  #4
Senior Member
 
Christian Lucas
Join Date: Aug 2009
Location: Braunschweig, Germany
Posts: 198
Rep Power: 8
Chris Lucas is on a distinguished road
Hi,

the reason for the different results is not a bug. Some of the internal program structure is different.

Fluent has probably internal limiter that help to converge the solution (using numerical diffusion) and openfoam doesn't.

What are you trying to simulate. What schemes do you use. What OF version? Is time accuracy important?

Kind Regards,
Christian

Chris Lucas 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
[Other] OpenFoam Mesh to Fluent Mesh, 2D lordvon ANSYS Meshing & Geometry 0 November 8, 2010 14:48
Cross-compiling OpenFOAM 1.7.0 on Linux for Windows 32 and 64bits with Mingw-w64 wyldckat OpenFOAM Announcements from Other Sources 3 September 8, 2010 06:25
Fluent elbow in Openfoam chemeng OpenFOAM 1 January 21, 2010 04:52
Modified OpenFOAM Forum Structure and New Mailing-List pete Site News & Announcements 0 June 29, 2009 05:56
Conversion Fluent cas and dat file to OpenFoam matteo_gautero OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 9 April 3, 2008 02:32


All times are GMT -4. The time now is 22:33.