Turbulence parameters and convergence

saisanthoshm88 · October 14, 2013, 11:30

I have observed that turbulent parameters played a major role in the convergence of a simulation. Initially when I simulated with the default values of intensity ans viscosity ratio (5 and 10) the convergence is bad and when I switched over to use intensity and hydraulic diameter (= 4A/P) there is an improvement in the convergence.

Could some one please provide a reasoning to this behavior

Far · October 14, 2013, 12:52

might be it is due to fact that you are giving parameters resembling the real physics in the latter case !!!

But you can manipulate to get the equivalent parameters for all options and you would probably get same convergence behaviour !!!

saisanthoshm88 · October 14, 2013, 14:41

In many cases it is not possible to have an understanding of the turbulence parameters to be used and how to identify if the convergence problem is due to the turbulence settings

October 14, 2013, 11:30	Turbulence parameters and convergence	#1
saisanthoshm88 Senior Member --------- Join Date: Oct 2010 Posts: 303 Rep Power: 17	I have observed that turbulent parameters played a major role in the convergence of a simulation. Initially when I simulated with the default values of intensity ans viscosity ratio (5 and 10) the convergence is bad and when I switched over to use intensity and hydraulic diameter (= 4A/P) there is an improvement in the convergence. Could some one please provide a reasoning to this behavior hashim84 likes this. __________________ Best regards, Santhosh.

October 14, 2013, 14:41		#3
saisanthoshm88 Senior Member --------- Join Date: Oct 2010 Posts: 303 Rep Power: 17	In many cases it is not possible to have an understanding of the turbulence parameters to be used and how to identify if the convergence problem is due to the turbulence settings __________________ Best regards, Santhosh.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Turbulence parameters and convergence	saisanthoshm88	CFX	3	October 15, 2013 06:00
Convergence of turbulence transport equations	KK	CFX	0	January 31, 2008 20:46
Do you know of any tweaks of the solver parameters to accelerate solution convergence	sek	OpenFOAM Running, Solving & CFD	0	September 15, 2006 13:45
convergence parameters	amv	Phoenics	4	September 21, 2005 06:49
turbulence convergence	irfan	Siemens	1	November 19, 2002 04:38

October 14, 2013, 12:52		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	might be it is due to fact that you are giving parameters resembling the real physics in the latter case !!! But you can manipulate to get the equivalent parameters for all options and you would probably get same convergence behaviour !!!