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Implicit gradient scheme, fvm::grad() ??

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Old   July 26, 2012, 09:03
Default Implicit gradient scheme, fvm::grad() ??
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Tian Tang
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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!
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Old   July 31, 2012, 16:06
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Haomin Yuan
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I am afraid you have to write a fvm::grad yourself, this function is not available in latest official version of OF.
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Old   August 1, 2012, 03:24
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Tian Tang
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Quote:
Originally Posted by yhaomin2007 View Post
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
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Old   July 6, 2014, 13:40
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Xiangyu Gao
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Hi, Tian

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

Regards,
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Old   October 2, 2014, 04:41
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fvm::grad is available in extended 3.1
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