CFD Online Discussion Forums - compressible flow tutorial

Hi everyone!

I am new in CFD and OpenFoam and i've got a question:

When i'm running the following tutorial:

/home/<user>/OpenFOAM/<user>-2.2.1/run/tutorials/compressible/rhoSimplecFoam/squareBend

the terminal gives the following warning-message:

Code:

--> FOAM Warning :

From function gaussConvectionScheme

in file finiteVolume/convectionSchemes/gaussConvectionScheme/gaussConvectionScheme.H at line 123

Reading "/home/<user>/OpenFOAM/<user>-2.2.1/run/duese/processor0/../system/fvSchemes.divSchemes.div(phid,p)" at line 40

Unbounded 'Gauss' div scheme used in steady-state solver, use 'bounded Gauss' to ensure boundedness.

To remove this warning switch off 'boundedGauss' in "/opt/openfoam221/etc/controlDict"

The tutorial-case still converges. What does this warning in fact mean and what does this 'bounded' mean?

If i change the following code in fvScheme from:

Code:

div(phid,p)         Gauss upwind;

div((phi|interpolate(rho)),p) Gauss upwind;

Code:

div(phid,p)         bounded Gauss upwind;

div((phi|interpolate(rho)),p)  bounded Gauss upwind;

the warning disappears... but the case also did not converges anymore

Thx!