Theory behind porousSimpleFoam - where to find citations?

KTG · June 29, 2018, 05:04

Hi,

I was wondering if anyone has any references explaining the theory behind porousSimpleFoam? I can see from the source code and this tutorial ( http://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf ) that there is a Darcy term added to the momentum equation. However, I can't find any papers or books to cite that explain why this is a model for porous zones. The papers I have found using porousSimpleFoam don't give a detailed derivation / explanation of the model, or any citations.

Sorry if this thread is out of place here - I couldn't find a better place for theory questions.

ancolli · June 16, 2020, 15:36

did u find any citation or book?
Thanks

dlahaye · June 16, 2020, 16:09

https://books.google.nl/books?id=KzV...0media&f=false

KTG · June 16, 2020, 17:06

The momentum extraction in the openFOAM implementation seems to be just Darcy-Forchheimer. The coefs are in Tensor form though, so search the openFoam user manual for the tensor syntax on that. It seems that these days you can do the same thing with FV options.

ancolli · June 17, 2020, 13:13

Quote:

Originally Posted by dlahaye

https://books.google.nl/books?id=KzV...0media&f=false

Thanks, but I do not see the equations used by porous SimpleFoam.
how you go from

U_Darcy = viscous terms + inertial terms

to

N-S = Source (inertial + viscous)

For me it is not clear at all.

ancolli · June 17, 2020, 13:20

Quote:

Originally Posted by KTG

The momentum extraction in the openFOAM implementation seems to be just Darcy-Forchheimer. The coefs are in Tensor form though, so search the openFoam user manual for the tensor syntax on that. It seems that these days you can do the same thing with FV options.

Yes, I saw, and I have tried both approaches, but I have some doubts:

a) Why there is a porousSimpleFoam solver if the porous region can be implemented with fvOptions using any solver?

b) How I should modify codeAddSup in order to allow D and F variable coefficients? in particular, i do not fully understand the coordinateSystem set with regards to the source term: https://openfoamwiki.net/index.php/DarcyForchheimer

thanks in advance

dlahaye · June 17, 2020, 15:18

Book by de Lemos is a general reference.

Cyprien Soulaine has done a lot of OpenFoam specific stuff.

https://link.springer.com/article/10...242-016-0701-3

KTG · June 17, 2020, 20:46

That paper looks interesting. With regards to the questions:

a) I am not sure. My guess is that the solvers existed before the fvoptions framework was implemented, and they have stuck around so industry people can use them without doing extra work.

b) I would like to hear the answer to this question as well! I think that #codestream should work for any dictionary entry, so maybe that is something you can try. You might be able to modify the example for setfields to work in this situation:
https://wiki.openfoam.com/Programming1

June 29, 2018, 05:04	Theory behind porousSimpleFoam - where to find citations?	#1
KTG Senior Member Abe Join Date: May 2016 Posts: 119 Rep Power: 10	Hi, I was wondering if anyone has any references explaining the theory behind porousSimpleFoam? I can see from the source code and this tutorial ( http://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf ) that there is a Darcy term added to the momentum equation. However, I can't find any papers or books to cite that explain why this is a model for porous zones. The papers I have found using porousSimpleFoam don't give a detailed derivation / explanation of the model, or any citations. Sorry if this thread is out of place here - I couldn't find a better place for theory questions.

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June 16, 2020, 15:36		#2
ancolli Senior Member Alejandro Join Date: Jan 2014 Location: Argentina Posts: 128 Rep Power: 12	did u find any citation or book? Thanks

June 16, 2020, 16:09		#3
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 802 Blog Entries: 1 Rep Power: 18	https://books.google.nl/books?id=KzV...0media&f=false

June 16, 2020, 17:06		#4
KTG Senior Member Abe Join Date: May 2016 Posts: 119 Rep Power: 10	The momentum extraction in the openFOAM implementation seems to be just Darcy-Forchheimer. The coefs are in Tensor form though, so search the openFoam user manual for the tensor syntax on that. It seems that these days you can do the same thing with FV options.

June 17, 2020, 15:18		#7
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 802 Blog Entries: 1 Rep Power: 18	Book by de Lemos is a general reference. Cyprien Soulaine has done a lot of OpenFoam specific stuff. https://link.springer.com/article/10...242-016-0701-3

June 17, 2020, 20:46		#8
KTG Senior Member Abe Join Date: May 2016 Posts: 119 Rep Power: 10	That paper looks interesting. With regards to the questions: a) I am not sure. My guess is that the solvers existed before the fvoptions framework was implemented, and they have stuck around so industry people can use them without doing extra work. b) I would like to hear the answer to this question as well! I think that #codestream should work for any dictionary entry, so maybe that is something you can try. You might be able to modify the example for setfields to work in this situation: https://wiki.openfoam.com/Programming1