error on turbulence scheme
Hi
I set a second order turbulence scheme with an error: Code:
divSchemes Code:
> FOAM Warning : thanks. 
Quote:
the question to me is, which version of OpenFoam you are using (the syntax is different in different versions) ? In OpenFoam 2.2.0 just do: Code:
divSchemes 
thanks Philip
yes,I use version 2.2.0 now I'm using rhoCentralFoam and it doesn't have a div(phi,U) in it. what to do with div(phi) instead? my case is unsteady and compressible. when we have to use bounded keyword?what conditions the problem should have? thanks. 
Greetings to all!
@Ehsan: "bounded" is the default option that OpenFOAM 2.2 indicates it will use, if not present in the respective line. For more information on this characteristic, see section "4.4.2 Surface normal gradient schemes" on the User Guide. Personally, I have no clue when "bounded" or other methods should be used... But the descriptions shown in the User Guide seem selfexplanatory!? And as Phillip hinted, the problem you were having was the missing "grad(epsilon)": Code:
div(phi,epsilon) bounded Gauss linearUpwind grad(epsilon); Best regards, Bruno 
thanks.
You mean 'bounded' is related to snGrad ?or may be different to that? I removed div(phi) without OF complaining. Then OF uses a default method for this term in rhoCentralFoam? 
Quote:
Quote:
But after looking at the source code, here's what I found:

thanks.
so bounded schemes can be only used in steadystate runs as i have understood. many thanks. 
Hi,
you can use the bounded scheme in non steadystate cases too. http://www.openfoam.org/version2.2.0/numerics.php The functionallity of that scheme is defined in the libOpenSmoke thread. 
yes I forgot about that thread.but I yet don't know exactly when bounded scheme should be used.
my case is compressible and unsteady and haven't a convergence problem. then should I use bounded? the fvScheme I use is this,is it correct or which changes I have to do? Code:
fluxScheme Kurganov; 
hi
can any one explian that what is the definition of bounded and unbounded schemes, e.g in this table for explain behaviour of interpolation schemes, which one is better, bounded or unbounded schemes? Table 4.10. Behaviour of interpolation schemes used in divSchemes linear : Second order, unbounded skewLinear : Second order, (more) unbounded, skewness correction cubicCorrected : Fourth order, unbounded upwind : First order, bounded linearUpwind : First/second order, bounded QUICK : First/second order, bounded TVD schemes : First/second order, bounded SFCD : Second order, bounded NVD schemes : First/second order, bounded 
Hi Saeideh,
You can find some notions of what "bounded" is on the Programmers Guide: http://foam.sourceforge.net/docs/Gui...mmersGuide.pdf Some more mentions are here: http://www.cfdonline.com/Wiki/Appro...grids__Common From the following link  http://cfd.mace.manchester.ac.uk/twi...s/cfd1pt1.pdf  I quote: Quote:
Bruno 
Quote:

All times are GMT 4. The time now is 13:12. 