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-   -   Implicit gradient scheme, fvm::grad() ?? (http://www.cfd-online.com/Forums/openfoam-programming-development/105263-implicit-gradient-scheme-fvm-grad.html)

tiat July 26, 2012 09:03

Implicit gradient scheme, fvm::grad() ??
 
hi, dear all,

i would like to ask a question about whether there is possiblity to have an implicit gradient scheme.

I am solving the momentum equation with pressure coupling, and i would like to use the block matrix solver. fvm::grad(p) seems necessary for constructing the coupling coefficients in the block. i searched this in the forum, in 2006 this question has been asked and the answer was no. I am very curious about what is the situation now? could anyone give me some helps?

Thanks ahead!

yhaomin2007 July 31, 2012 16:06

I am afraid you have to write a fvm::grad yourself, this function is not available in latest official version of OF.

tiat August 1, 2012 03:24

Quote:

Originally Posted by yhaomin2007 (Post 374662)
I am afraid you have to write a fvm::grad yourself, this function is not available in latest official version of OF.

hi Haomin,

thanks for your reply :)
Yes, i've just figured out no implicit gradient operator availble in openfoam yet, but there are some researchers did manage to solve the pressure coupling implicitly. i found this interesting paper in the 7th OpenFOAM Workshop by L. Mangani , M. Darwish2 and M. Buchmayr. the title is A fully integrated pressure based coupled solver using block GAMG acceleration. i'm reading the related reference at present, hopefully i could find the way out.

regards,
Tian

gxy200992243 July 6, 2014 13:40

Hi, Tian

Have you figured out how to express grad() implicitly? I am now facing the same problem..........

Regards,

Henning86 October 2, 2014 04:41

fvm::grad is available in extended 3.1


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