CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Large Problem

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

Like Tree1Likes
  • 1 Post By LuckyTran

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 14, 2018, 10:35
Question Large Problem
  #1
New Member
 
Edmond Lam
Join Date: Jun 2015
Location: Geneva, CH
Posts: 15
Rep Power: 8
edmondlam is on a distinguished road
Hi guys,

I have a large problem to solve with FLUENT. I did the mesh with ICEM CFD. I would like to ask if there are tricks to reduce the memory usage of FLUENT, i.e. is there a way to avoid loading the entire mesh into the RAM? It would be great if there is a way to specify the boundary conditions, solution methods, etc. "externally" without opening the FLUENT GUI and loading the mesh.

In the end I only need a FLUENT case file which I can solve with a cluster - where required size of memory won't be an issue.

Thanks in advance!

Edmond
edmondlam is offline   Reply With Quote

Old   February 14, 2018, 17:28
Default
  #2
Senior Member
 
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 4,783
Rep Power: 56
LuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura aboutLuckyTran has a spectacular aura about
There's no way to avoid loading the entire mesh in Fluent if you want to open the case file.

But you can always create a journal file (or less elegantly record a macro) to change all the boundary conditions and settings and this journal file can be run on the cluster. The difficulty here is that you need to know how to make this journal file (learn how to use the TUI instead of the GUI).

Of course being unable to load the mesh in your local machine does not help you to experiment. I would recommend to generate an extremely coarse mesh that you can load on your local machine and play with the TUI commands. You could even use this coarse mesh to do all the settings and then replace the mesh with the final mesh that you want to run (but be ready for lots of things going wrong if you don't know what you're doing).

An even more painful method is to open the .cas file with a text editor and manually change the text there. The .cas file is just a really big ascii text file (unless you save it as a binary) which contains all these settings.

In the end, you need some skills/experience dealing with Fluent.
edmondlam likes this.
LuckyTran is offline   Reply With Quote

Old   February 14, 2018, 17:54
Default
  #3
New Member
 
Edmond Lam
Join Date: Jun 2015
Location: Geneva, CH
Posts: 15
Rep Power: 8
edmondlam is on a distinguished road
Thanks for your reply!! I think I will try with your methods now
edmondlam is offline   Reply With Quote

Reply

Tags
cluster, large, memory, ram, rsm

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
displacementSBRStress motion solver with large rotation suddenly blow up zhaozhenkai OpenFOAM Running, Solving & CFD 0 January 25, 2017 08:06
Large particle problem weeBlueGalaxy OpenFOAM Running, Solving & CFD 1 January 24, 2017 10:05
Fluent Parallelization Problem After AC Power Dropped pawl Hardware 5 November 13, 2016 06:08
Heat Transfert, mixing problem Wazdq CFX 8 November 7, 2016 05:44
extremely simple problem... can you solve it properly? Mikhail Main CFD Forum 40 September 9, 1999 09:11


All times are GMT -4. The time now is 23:33.