[basneb]

Good morning everyone,

I am writing my Master's Thesis on OpenFoam right now and I made a study concerning different grad- and divSchemes. In order to avoid writing something wrong in my thesis, I would like to ask about the difference between faceLimited and cellLimited gradSchemes. Can anyone explain it, please? What does the factor mean (e.g. faceLimited Gauss linear 1)?
Furthermore, let's consider a divScheme like "Gauss linearUpwind faceLimited Gauss linear 0.5". I understand that linearUpwind is a blending between upwind(first order) and linear(second order). But what specifies how much blending is used and why do I have to specify a gradScheme in order to use linearUpwind?

So, I hope that these are not too many questions for an early morning. :-)

Thank you very much already in advance!

Have a nice day,
Bastian.

[kaergaard]

I am also looking for documentation on faceLimited vs cellLimited and the factor. Please help us out here...anyone?

[Robat]

Hi.
The coefficient [0...1] decides, if you got better convergence(=1) or a more accurate solution(=0). See OF1.5 UsersGuide around p.108 for detailed information.

...I'm interested in your Thesis Paper. I would be pleased, if you grant me to take a look at.

Regards,
Robert

PS: Better use tags for your tread to become more visible.

[makaveli_lcf]

Robert,

but what is actually the difference between cell and face limitting?

[Robat]

As I unterstood it:
faceLimited extrapolates the values between face neighbours and CellLimited does the same for cell neighbours.
But better form your own opinion.
Just take a look at their source code:

http://foam.sourceforge.net/doc/Doxy...8H_source.html
http://foam.sourceforge.net/doc/Doxy...8H_source.html

The code shows not much of a difference.

bests,
Robert

[s.m]

Originally Posted by Robat

Hi.
The coefficient [0...1] decides, if you got better convergence(=1) or a more accurate solution(=0). See OF1.5 UsersGuide around p.108 for detailed information.

...I'm interested in your Thesis Paper. I would be pleased, if you grant me to take a look at.

Regards,
Robert

PS: Better use tags for your tread to become more visible.

Dear Robert,

the coefficient that you explain about is e.g "0.5" that is in "Gauss linearUpwind faceLimited Gauss linear 0.5"?

Thank you.

[elvis]

Hi,

here is "Professor Jasak´s Thesis collection" hope you find useful for your needs http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/

http://www.openfoamworkshop2013.org/...rvojeJasak.tar Discretisation Best Practice for Industrial CFD with OpenFOAM