# Momentum equation of interFoam?

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 March 25, 2010, 23:16 Momentum equation of interFoam? #1 New Member   bubbles Join Date: Mar 2010 Location: France adn Viet Nam Posts: 4 Rep Power: 9 Dear Foamer, I am a beginner in interFoam of OpenFoam. I wonder if there are someone could show me how the momentum equation of interFoam in version 1.6.x is demonstrated below: ddt(rho,U) + div(rhophi,U) = grad(P) + rho*g + fv + laplace(mueff,U) inwhich: fv : surface tension force rho = alpha1*rho1+(1-alpha1)*rho2 U = alpha1*U1+(1-alpha1)*U rhophi = rho*U + alpha1*(1-alpha1)*(rho1-rho2)*(U1-U2) I tried from two equations of each phase, but I am not successful. Thanks a lot. Milou

 March 26, 2010, 07:58 #2 Senior Member   Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 11 Check the internet for Ruschke's Ph. D. Thesis! In this forum is this thesis serveral times mentioned, just keep looking at it. If ya can't find it, send me aderess to where I can send it! Cheers

 March 26, 2010, 09:14 #3 Senior Member   Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 11 ************ http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/HenrikRuschePhD2002.pdf ***************

 March 26, 2010, 12:14 #4 New Member   bubbles Join Date: Mar 2010 Location: France adn Viet Nam Posts: 4 Rep Power: 9 Thanks for your quick reply. In fact, I had read Rusche's PhD thesis several times but if I wouldn't make a mistakes and what I understand is that the chapter 3: Two Fluid Methodology describes the averaged equation for each phase and the model for the last term in the averaged momentum equation; and the chapter 4: Interface capturing Methodology talks about the mometum equation for a domaine with an interface by using the indicator gamma or alpha1. By looking all two chapters, I could not find some things similar to: ddt(rho,U)+div(rhophi,U)=.... and how can we explain that: rhophi = rho*U + alpha1*(1-alpha1)*(rho1-rho2)*(U1-U2) Thanks for your answer. Milou

 March 28, 2010, 04:17 #5 Senior Member   Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 11 Properly you have already found it: http://www.cfd-online.com/Forums/ope...of-method.html In this blog there is a hot discussion on going. Cheers,

 March 28, 2010, 07:54 #6 New Member   bubbles Join Date: Mar 2010 Location: France adn Viet Nam Posts: 4 Rep Power: 9 Dear Claus Meister, Thanks for your indication on VOF method blog. I will go to these comments on the blog immediately. Best regards

 March 28, 2010, 08:46 #7 New Member   bubbles Join Date: Mar 2010 Location: France adn Viet Nam Posts: 4 Rep Power: 9 Dear Claus, I read the blog of VOF method, really, there are many comment on VOF method, especially on the gamma equation, on interface properties base on gamme discusion, on MULES... And I found that there are the thesis of Patricio Bohorquez is very interesting, especially the definition of "mass velocity" and "volumetric velocity". But I could not find out my question there. Thanks for your patient support. Best regards. Milou

 September 13, 2012, 15:27 #8 Member   einat Join Date: Jul 2012 Posts: 31 Rep Power: 7 see equation 4.24 in Rusche's thesis. That's the form of the momentum equation closest to the code as far as I could find.

January 4, 2013, 05:44
#9
New Member

Hossein Yahyazadeh
Join Date: Oct 2012
Posts: 9
Rep Power: 7
Quote:
 Originally Posted by idrama ************ http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/HenrikRuschePhD2002.pdf ***************
Hi idrama,
Would yo please send me the PDF file of this thesis, I cannot access to it.
Thanks

 January 5, 2013, 04:09 #10 Senior Member   Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,240 Blog Entries: 1 Rep Power: 18 you can also check this journal: http://pre.aps.org/abstract/PRE/v79/i3/e036306 __________________ Telegram channel (https://telegram.me/openfoam4Iranian) My Weblog in Persian(http://openfoam.blogfa.com/) My Personal Website (http://nimasamkhaniani.ir/)

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