Steady State scalarTransportFoam Problem

FlyBob91 · December 20, 2016, 11:03

Hello to all,
during the run of my case in steady stade cindition this message continues to appear

Code:

--> FOAM Warning : 
    From function gaussConvectionScheme
    in file finiteVolume/convectionSchemes/gaussConvectionScheme/gaussConvectionScheme.H at line 123
    Reading "/home/roby/Scrivania/Ultimate/Scalar/system/fvSchemes.divSchemes.div(phi,T)" at line 31
    Unbounded 'Gauss' div scheme used in steady-state solver, use 'bounded Gauss' to ensure boundedness.
    To remove this warning switch off 'boundedGauss' in "/home/roby/OpenFOAM/OpenFOAM-2.3.0/etc/controlDict"
^C

Maybe i have to also change the solver (?)
Any idea?

Thanks for help,
Roberto

RobertHB · December 21, 2016, 04:38

Take a look at your fvSchemes file (case/system/...)
Change your div(phi,T) entry from "unbounded Gauss" to "bounded Gauss" or "Gauss [...]".

Should fix your problem. Anyhow your current message is just a warning and not an error. To further establish which entry you want, try to gain an understanding about what it means if a solution is bounded or unbounded.

Regards,
Robert

FlyBob91 · December 21, 2016, 07:07

Hi Robert, thanks for your reply.
I've just change the scheme in "bounded Gauss limitedLinear 1". The case runs however what i noticed is the simulation runs very slowly respect to the unsteady simulation.
Maybe could the problem be the solver which in this case is set to PBiCG?

Furthermore the residual stops decrasing around 10^(-3) while in the unsteady simulation around 10^(-11)

Best Regards,
Roberto

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December 21, 2016, 04:38		#2
RobertHB Senior Member Robert Join Date: May 2015 Location: Bremen, GER Posts: 292 Rep Power: 12	Take a look at your fvSchemes file (case/system/...) Change your div(phi,T) entry from "unbounded Gauss" to "bounded Gauss" or "Gauss [...]". Should fix your problem. Anyhow your current message is just a warning and not an error. To further establish which entry you want, try to gain an understanding about what it means if a solution is bounded or unbounded. Regards, Robert

December 21, 2016, 07:07		#3
FlyBob91 Senior Member Join Date: Mar 2016 Location: Bergamo Posts: 157 Rep Power: 10	Hi Robert, thanks for your reply. I've just change the scheme in "bounded Gauss limitedLinear 1". The case runs however what i noticed is the simulation runs very slowly respect to the unsteady simulation. Maybe could the problem be the solver which in this case is set to PBiCG? Furthermore the residual stops decrasing around 10^(-3) while in the unsteady simulation around 10^(-11) Best Regards, Roberto