[waves2Foam] Doubts about the viscous term in porousWaveFoam and Jensen's paper

jl637 · March 27, 2014, 11:17

Hi Niels,

I will be starting in a short time with the porous part on waves2Foam and I am currently trying to figure out all the details regarding the volume averaging procedure and the implementation in OpenFOAM.

So far I have spotted something that is not clear to me, so I would be grateful if you could clarify it. Regarding equation 4 in Jensen's paper I see that "1/n" is outside the viscous term, however in porousWaveFoam it is implemented as "fvm::laplacian(muEff/porosityFace, U)", so it is inside the laplacian.

Reading this thread clarified me lots of things about the two viscous components:

http://www.cfd-online.com/Forums/ope...-equation.html

Is this a bug?

ngj · March 27, 2014, 15:24

@jl637: The Laplacian in OpenFoam is divided into the explicit and implicit contributions, why the implementation of the Laplacian does match the equations in the mentioned reference.

Kind regards,

Niels

March 27, 2014, 11:17	Doubts about the viscous term in porousWaveFoam and Jensen's paper	#1
jl637 New Member Join Date: Aug 2011 Posts: 1 Rep Power: 0	Hi Niels, I will be starting in a short time with the porous part on waves2Foam and I am currently trying to figure out all the details regarding the volume averaging procedure and the implementation in OpenFOAM. So far I have spotted something that is not clear to me, so I would be grateful if you could clarify it. Regarding equation 4 in Jensen's paper I see that "1/n" is outside the viscous term, however in porousWaveFoam it is implemented as "fvm::laplacian(muEff/porosityFace, U)", so it is inside the laplacian. Reading this thread clarified me lots of things about the two viscous components: http://www.cfd-online.com/Forums/ope...-equation.html Is this a bug?

March 27, 2014, 15:24		#2
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,900 Rep Power: 37	@jl637: The Laplacian in OpenFoam is divided into the explicit and implicit contributions, why the implementation of the Laplacian does match the equations in the mentioned reference. Kind regards, Niels __________________ Please note that I do not use the Friend-feature, so do not be offended, if I do not accept a request. Last edited by wyldckat; November 4, 2018 at 13:53. Reason: removed answer to another post that was on the main thread