CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

Smaller trn files

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 4, 2012, 14:37
Default Smaller trn files
  #1
New Member
 
Kyriakos Vafiadis
Join Date: Feb 2011
Location: Kozani, Greece
Posts: 27
Rep Power: 5
k.vafiadis is on a distinguished road
Send a message via Skype™ to k.vafiadis
Hello, is there a way to produce smaller trn files (or to shrink them)?
I run a transient simulation (ANSYS 13) of a 40m diameter wind turbine rotor (rotating at 27rpm) in a period of 60min. I take transient results every minute and every file is about 1.36GB.
Any ideas in how to reduce the files' size?
Thanks in advance
Kyriakos
k.vafiadis is offline   Reply With Quote

Old   May 4, 2012, 18:42
Default Variable list
  #2
Member
 
Mauricio Labarca
Join Date: Aug 2009
Posts: 35
Rep Power: 7
mauricio is on a distinguished road
Hello Mr Vafiadis,

You can try setting the results to only contain the variables you expect to use in your postprocessing. Also set the compression to "Low speed most compression" that will add proccesing time everytime you write or open results, but it saves some space.

If you do that and you still get too big results, consider getting results every two minutes, or maybe setting an expression to get more results in the beggning (say, 10 results in the first minute) and less in the end, and ending up with less unused timesteps.

Also, i'm not really sure if what's causing the size of the trn file is that your mesh could be too large/fine. How about running a simple mesh or simpler case to identify the timesteps that are more of interest and then getting results focused on those steps?
mauricio is offline   Reply With Quote

Old   May 5, 2012, 07:23
Default
  #3
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 9,551
Rep Power: 76
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
Assuming you cannot save fewer time steps, the thing which saves the most space is reducing the number of variables in the file. If you only save the pressure field and no other variables the file size will shrink dramatically. Obviously you will not be able to do any post processing on anything but pressure then. So consider what post processing you are going to do in advance, and only save those variables. Don't forget you will also save the mesh if it is a moving mesh/FSI simulation.
ghorrocks is offline   Reply With Quote

Old   May 5, 2012, 15:15
Default
  #4
New Member
 
Kyriakos Vafiadis
Join Date: Feb 2011
Location: Kozani, Greece
Posts: 27
Rep Power: 5
k.vafiadis is on a distinguished road
Send a message via Skype™ to k.vafiadis
Thank you all for your answers!
You helped me a lot!
k.vafiadis 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
UDF issue MASOUD Fluent UDF and Scheme Programming 14 December 6, 2012 13:39
critical error during installation of openfoam Fabio88 OpenFOAM Installation 21 June 2, 2010 03:01
OF 1.6 | Ubuntu 9.10 (64bit) | GLIBCXX_3.4.11 not found piprus OpenFOAM Installation 22 February 25, 2010 13:43
Problems in compiling paraview in Suse 10.3 platform chiven OpenFOAM Installation 3 December 1, 2009 07:21
how to recover trn files after crash? pi CFX 4 August 25, 2004 05:45


All times are GMT -4. The time now is 21:26.