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

How to estimation the dsmcFoam has get steady-state condition?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   December 24, 2010, 12:56
Default How to estimation the dsmcFoam has get steady-state condition?
  #1
New Member
 
luffy
Join Date: Sep 2010
Posts: 1
Rep Power: 0
luffy0503 is on a distinguished road
Dear foamers,

I used dsmcFoam to simulate hypersonic flow. The example of estimation of steady-state conditions in the paper "T.J. Scanlon, E. Roohi, C. White, M. Darbandi, J.M. Reese. An open source, parallel DSMC code for rarefied gas flows in arbitrary geometries. Computers & Fluids 39 (2010) 2078-2089 ". It used the total number of DSMC particles in the system to estimate the iteration achieved steady-state that show in Fig.3 on the paper.

We can see the total number of DSMC particles in the "log.dsmcFoam" file of each time iterate. How to plot the graph that X axis is iterations, Y axis is the number of DSMC particles by captured the partilces data from the "log.dsmcFoam" file? Then estimate the iterations achieved steady-state condition.
luffy0503 is offline   Reply With Quote

Old   November 1, 2011, 06:49
Default
  #2
New Member
 
Join Date: Dec 2010
Posts: 3
Rep Power: 6
Paul_Re is on a distinguished road
"The full DSMC simulation is considered to have reached steady-state when the total number of simulation particles no longer varies appreciably."

A hybrid particle-continuum method applied to shock waves, Journal of Computational Physics, Volume 215, Issue 2, 1 July 2006, Pages 402-416

I think it is the typical requirement for an steady-state.

My value out of log.dsmcFoam is

Number of dsmc particles = 1272

So i think one should consider this value, or? Is this value not changing you may have something like an steady-state.

But i am not sure how to visualize in paraFoam these values (iterations vs no of particles). There are some statistical filters ... these could be used ...

But I think you have to collect them manually out of log.dsmcFoam ... ?

b.r., p
Paul_Re 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
Constant velocity of the material Sas CFX 15 July 13, 2010 08:56
regarding steady state discrete phase calculations hajszan_gyula FLUENT 1 February 28, 2006 02:32
Local stepping for steady state Mehdi Main CFD Forum 2 June 17, 2003 09:43
About the difference between steady and unsteady problems Lisa Main CFD Forum 11 July 5, 2000 14:37
Steady state formulation of turbulence ?? Jitendra Main CFD Forum 1 June 27, 2000 18:49


All times are GMT -4. The time now is 03:23.