# Simulationtime for scalarTransportFoam

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 January 25, 2013, 13:19 Simulationtime for scalarTransportFoam #1 Senior Member   Sören Join Date: Mar 2012 Posts: 102 Rep Power: 5 Hi, I've just a short question about scalarTransportFoam. There are no eddys, turbulences or other transient parts in my velocity field. Now I'm simulating the distribution of a scalar in this velocity-field. The question ist when to stop the simulation? I thought about: a) measure the scalar-input and -output. When conservation of mass is reached then stop the simulation. If this is correct how would you justify this as the criterium to stop at? b) make sample-pictures at different time-steps. When there are no changes in the sample-pictures of the concentration field one can say that the simulation should be stoped. c) measure the way a scalar moves from inlet to outlet. Divide this way by the velocity (average velocity or something like this) and then you get the timestep to that you have to run the simulation. Could you give me a short feedback/comment...the answer to my initial question is also welcome Cheers Last edited by despaired student; January 26, 2013 at 16:03.

 January 25, 2013, 21:54 #2 Senior Member   Fumiya Nozaki Join Date: Jun 2010 Location: Yokohama, Japan Posts: 169 Rep Power: 7 Hi, If your velocity field is steady, I think the scalar distribution reaches a steady state at some time. You can monitor the time history of scalar distributions at some points using the probes function and stop simulation when variations become smaller than your criterion. I think you can estimate the approximate time needed to reach steady state by the method you wrote in c. Hope that helps, Fumiya

 January 26, 2013, 16:05 #3 Senior Member   Sören Join Date: Mar 2012 Posts: 102 Rep Power: 5 Hi fumiya, thanks for your reply. You are right the probe utility should work fine in my case...haven't thought about it...my bad regards

 Thread Tools Display Modes Linear Mode

 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 OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT -4. The time now is 23:19.

 Contact Us - CFD Online - Top