Fluctuating residuals in transient simulation (transientSimpleFoam)

robingilbert · November 17, 2011, 18:18

Hello everyone,

I modified the transientSimpleFoam to add a temperature equation and tried to run a case of t-junction from pimpleFoam tutorial with the exact same boundary conditions. The residuals I get, fluctuate a lot as shown in the figure:

The fvScheme is as follows:
https://rapidshare.com/files/784318946/fvSchemes

fvSoultion is as follows:
https://rapidshare.com/files/889178775/fvSolution

The boundary conditions are exactly same as that in pimpleFoam case with T at inlet =400K and everywhere else is 300K.
Why is there so much fluctuation in the residuals??

Thank you

robingilbert · November 17, 2011, 20:36

Hello everyone,

I figured out that I was plotting residuals incorrectly. My bad. Sorry!!

November 17, 2011, 18:18	Fluctuating residuals in transient simulation (transientSimpleFoam)	#1
robingilbert Member Robin Gilbert Join Date: Jan 2010 Posts: 66 Rep Power: 16	Hello everyone, I modified the transientSimpleFoam to add a temperature equation and tried to run a case of t-junction from pimpleFoam tutorial with the exact same boundary conditions. The residuals I get, fluctuate a lot as shown in the figure: The fvScheme is as follows: https://rapidshare.com/files/784318946/fvSchemes fvSoultion is as follows: https://rapidshare.com/files/889178775/fvSolution The boundary conditions are exactly same as that in pimpleFoam case with T at inlet =400K and everywhere else is 300K. Why is there so much fluctuation in the residuals?? Thank you

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
problem with journal-file in transient simulation	stimpy	FLUENT	2	January 4, 2013 00:16
Resume Transient simulation	HMR	CFX	1	June 28, 2011 22:13
a transient simulation question	rystokes	CFX	3	June 3, 2009 08:44
Steady-state simulation to start a transient simulation	smagmon	CFX	2	May 18, 2009 04:59
Initialisation in transient simulation with ASIs	Phil D	Siemens	7	January 30, 2008 08:44

November 17, 2011, 20:36		#2
robingilbert Member Robin Gilbert Join Date: Jan 2010 Posts: 66 Rep Power: 16	Hello everyone, I figured out that I was plotting residuals incorrectly. My bad. Sorry!!