CFD Online Logo CFD Online URL
Home > Forums > FLUENT

Time step, Number of time step, Maxximum Iterations per time step

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

LinkBack Thread Tools Display Modes
Old   July 18, 2011, 02:57
Default Time step, Number of time step, Maxximum Iterations per time step
New Member
Join Date: Jan 2011
Posts: 29
Rep Power: 8
sandisk is on a distinguished road
I am performing transient simulation of slurry flow in horizontal pipe, ( am new to CFD). I understand that slurry flow is best simulated in unsteady state. I am using mixture model and my sand conc varies from 0-10 %. However, I am not sure how to specify the time step size and number of time step.. My length of the pipe is 21 ft and I have discretized it into 750 points, so each cell length in z direction is 0.33 inches or 0.027 feet. My velocity of flow is 12 ft/sec. So , should I be giving time step as 0.027/12 = 0.00231 sec or abt 1/3rd of this value. Also, i read that time step size is set in such a way that the simulation converges within 5-7 iterations for each step. So i can leave the max iterations per time step at default values. But I dont know what criterion should be used for Number of time steps. Any help would be appreciated.
sandisk is offline   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
Compressible Nozzle Flow sebastian OpenFOAM Running, Solving & CFD 14 September 21, 2016 10:47
Extrusion with OpenFoam problem No. Iterations 0 Lord Kelvin OpenFOAM Running, Solving & CFD 8 March 28, 2016 11:08
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Unknown error sivakumar OpenFOAM Pre-Processing 9 September 9, 2008 12:53
Transient simulation not converging skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48

All times are GMT -4. The time now is 11:01.