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-   -   Viscous Fluxes in Finite Volume Method (http://www.cfd-online.com/Forums/main/105680-viscous-fluxes-finite-volume-method.html)

CharlieTan84 August 6, 2012 10:23

Viscous Fluxes in Finite Volume Method
 
Hello people. I have a question.

How are the viscous fluxes calculated in Finite Volume Method. Especially the ones close to the wall?

Thank you in advance.

leflix August 6, 2012 10:34

Quote:

Originally Posted by CharlieTan84 (Post 375611)
Hello people. I have a question.

How are the viscous fluxes calculated in Finite Volume Method. Especially the ones close to the wall?

Thank you in advance.

close to the wall you just have to account with boundary conditions, but the way to compute them are identical as in the domain.

For the discretization of diffusive flux, check books on finite volume.
for example:
http://www.cfd-online.com/Books/show_book.php?book_id=4
http://www.amazon.com/An-Introductio...254211-2149843

cbarmpar September 14, 2012 13:32

More information on the treatment of the viscous fluxes on the walls.
 
Quote:

close to the wall you just have to account with boundary conditions
Is this any different from the standart use of the ghost cells and the related methodology?
Is it possible to point on relavant information or to provide details?

Many thanks

FMDenaro September 14, 2012 14:31

Quote:

Originally Posted by cbarmpar (Post 381847)
Is this any different from the standart use of the ghost cells and the related methodology?
Is it possible to point on relavant information or to provide details?

Many thanks

you simply compute a lagrangian polynomial of some degree on an asymmetric stencil, the use the first derivative evaluated on the flux section.

cbarmpar September 14, 2012 14:44

Quote:

Originally Posted by FMDenaro (Post 381860)
you simply compute a lagrangian polynomial of some degree on an asymmetric stencil, the use the first derivative evaluated on the flux section.

Could you please provide some details or point to a relevant reference?

Thanks


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