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!

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

Hi, Tian

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

Regards,

fvm::grad is available in extended 3.1

Would you kindly send me this paper as I cannot find it?

James