CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

CFX Varying time-step and Results freequency

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

LinkBack Thread Tools Search this Thread Display Modes
Old   April 16, 2012, 11:14
Default CFX Varying time-step and Results freequency
New Member
Join Date: Apr 2012
Posts: 2
Rep Power: 0
jstaylor89 is on a distinguished road
I have a CFX simulation that is basically a pipe with inlet and outlet orifice's. the simulation runs over 4.5ms, with a time step of 0.1ms. I now need to run the same simulation but with inlet events before this to try and replicate initial conditions. This brings the whole simulation to 1050ms (1.05s), but I only need the results from the last 4.5ms as before.

I have it all set up but running it now would give me 10500 time steps and take 600+ hours and 240GB results.

The accuracy of the first 700ms is not so important so ideally I want a time-step of 10ms for the first 700ms, then change to a 0.1ms time-step after this. Is this possible and if so, how?

I would also like to only record the results near the end. I have tried setting trn results to, Time Interval: t>0.99[s], but this gives me a resolves to dimensionless error. Any ideas on this?

jstaylor89 is offline   Reply With Quote


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
Extrusion with OpenFoam problem No. Iterations 0 Lord Kelvin OpenFOAM Running, Solving & CFD 8 March 28, 2016 11:08
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 05:36
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 05:24
DPM UDF particle position using the macro P_POS(p)[i] dm2747 FLUENT 0 April 17, 2009 01:29

All times are GMT -4. The time now is 06:22.