CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

large model problems

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

LinkBack Thread Tools Display Modes
Old   November 19, 2003, 05:39
Default large model problems
Lars Andersson
Posts: n/a
We are trying to run a 70 million cell model. The .msh can be read into fluent, after writing down the .cas it can not be read into fluent. Also we have seen that it takes extremely long time to read and write down large models (30 millions) in parallel. Has anybody some idea regarding these problems ?
  Reply With Quote

Old   November 19, 2003, 14:00
Default Re: large model problems
Posts: n/a
Yup. Takes extremely long. My 3 million cell problems take between 1 and 2 hours to read onto a parallel machine. There is an rpsetvar command to speed up the communication but this will lead to a crash, tested it several times.

I guess that now people will go more and more to larger problems on parallel machines, Fluent will really have to address this issue!
  Reply With Quote

Old   November 25, 2003, 01:41
Default Re: large model problems
Posts: n/a
I have run a 31 million cell simulation before. Read in and write out time will depend on the machines you are using, but my read in time is about 6 hours for case and data on two Sun Ultra Enterprise 6500 machines using 36 cpu's. As for the error on read in, I have no idea from the information provided. Maybe someone could help if you gave the error you are receiving? Good Luck, Casey
  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
non-linear k-epsilon model implementation problems Saidi Main CFD Forum 2 March 4, 2010 14:23
Problems with Unsteady simulations using LRR Model in transientSimpleFoam barath.ezhilan OpenFOAM Running, Solving & CFD 1 July 25, 2009 13:58
multiphase cfd model problems zhijing peng FLUENT 0 January 7, 2009 14:07
Convergence problems with SSG turbulence model Ram CFX 1 June 19, 2006 10:08
Search of large problems Rashid Faizullin Main CFD Forum 0 September 10, 1998 13:46

All times are GMT -4. The time now is 22:44.