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

How small to choose the timestep?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 21, 2011, 15:47
Default How small to choose the timestep?
  #1
New Member
 
Kristin Kerst
Join Date: Jan 2011
Posts: 11
Rep Power: 6
kriskerst is on a distinguished road
Hello everyone,

I try to simulate a static mixer.
The timestep, I calculated following:
Co = 0.01
u = 0.0062
delta x = 0.00025 m

Co = (u * delta t)/ delta x
--> delta t = 0.0004 s

With "simpleFoam" everything was ok, but I would like to use the solver "icoFoam".
With icoFoam I took delta t = 0.00001 s, but still was not ok. I run it on a cluster, because on my notebook it lasted 8 hours to do the first 0,5 seconds.

I choosed the endTime 12.

Maybe it also could be another adjustment in icoFoam. If somebody has experience with this solver, it would be great.

My blockMeshDic:
Attached Files
File Type: zip blockMeshDict.zip (8.2 KB, 2 views)
kriskerst 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
Restart 2-way FSI with different timestep? Lance CFX 11 April 17, 2013 00:37
Timestep study ijk CFX 6 April 9, 2010 07:38
transient timestep tony CFX 1 March 12, 2008 17:39
InterFoam very small timestep unoder OpenFOAM Running, Solving & CFD 12 November 27, 2005 08:47
Timestep with different size of mesh Liu Main CFD Forum 3 June 6, 2004 04:04


All times are GMT -4. The time now is 17:53.