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-   -   Fluctuating residuals in transient simulation (transientSimpleFoam) (http://www.cfd-online.com/Forums/openfoam/94517-fluctuating-residuals-transient-simulation-transientsimplefoam.html)

robingilbert November 17, 2011 18:18

Fluctuating residuals in transient simulation (transientSimpleFoam)
 
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: http://img21.imageshack.us/img21/6919/screenshotepd.png

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!!


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