|
[Sponsors] |
March 22, 2012, 16:43 |
time step vs convergence
|
#1 |
Member
andres
Join Date: Sep 2010
Posts: 44
Rep Power: 15 |
Hi! this is the problem...
I need to perform unsteady state study to get info about how a system behaves during 60 seconds. If I use a time step of 0.00001 it converges perfect and the results seem to be right. But it will take weeks of running calculations... so it doesn't work If I use another time step... it diverges. If I use a coarsen mesh, it diverges because of the poor mesh. I am working with density-based , implicit time advancement , courant number 0.1 any suggestion??? thanks |
|
March 26, 2012, 02:00 |
|
#2 |
New Member
Derek Liu
Join Date: Nov 2011
Posts: 3
Rep Power: 14 |
I think it is just the way how CFD works... You have to choose a good time step according to your mesh and the phenomenon that you would like to simulate. There is no good way of making the time step larger...
That is my experience... |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
SLTS+rhoPisoFoam: what is rDeltaT??? | nileshjrane | OpenFOAM Running, Solving & CFD | 4 | February 25, 2013 04:13 |
Force can not converge | colopolo | CFX | 13 | October 4, 2011 22:03 |
Orifice Plate with a fully developed flow - Problems with convergence | jonmec | OpenFOAM Running, Solving & CFD | 3 | July 28, 2011 05:24 |
Modeling in micron scale using icoFoam | m9819348 | OpenFOAM Running, Solving & CFD | 7 | October 27, 2007 00:36 |
AMG versus ICCG | msrinath80 | OpenFOAM Running, Solving & CFD | 2 | November 7, 2006 15:15 |