Fluctuating residuals in transient simulation (transientSimpleFoam)

robingilbert · November 17, 2011, 17:18

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, 19:36

Hello everyone,

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

November 17, 2011, 17:18	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

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November 17, 2011, 19:36		#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!!