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February 26, 2010, 13:35 
New solver guides

#1 
Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
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Hello,
I have recently put on the wiki two new guides
More will come in some time, with the idea of documenting at least the fundamental main solvers. Of course comments, tips, and reports on mistakes are welcome! Best,
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

February 27, 2010, 22:58 

#2 
New Member
Darrin Stephens
Join Date: Mar 2009
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Alberto, thanks for adding these new guides to the wiki. In the bubbleFoam description you refer to the phaseintensive formulation of the phase momentum equations proposed by Weller. Do you have a copy of this reference or know where I could get a copy?


February 27, 2010, 23:26 

#3  
Senior Member
Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
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Quote:
The phaseintensive formulation is a way to manage the problem of the singularity in the momentum equation when the phase fraction becomes zero. If you expand the time derivative and the convective term, so to rewrite the momentum equation in nonconservative form, you can then divide the equation by the phase fraction. In such a situation, you only have one term that could give problems, since the phase fraction has been removed from all the other terms. This term is in the form grad(alpha)/alpha, which is assumed to be well behaved when alpha > 0. Of course the price you pay is that the momentum equation is resolved in nonconservative form (see the papers from Jeong). Work is (slowly, it's not my primary activity ) in progress to have a code with the conservative form of the equations. Best,
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Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

March 1, 2010, 06:10 

#4 
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Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Deltares, Delft, The Netherlands
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Hi Alberto
Congratulations on making your rather extensive work public. At a first glimpse it looks as an exhaustive description. Best regards, Niels 

March 9, 2010, 08:20 

#5 
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Aniko Rakai
Join Date: Oct 2009
Location: Geneva
Posts: 30
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Hi Alberto, thanks a lot for pushing it to the wiki. Especially the part about IOdictionary was very useful to me. And the structure is great if I download in pdf.


March 9, 2010, 12:39 

#6 
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Francois Beaubert
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Location: Lille, France
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Thanks Alberto for your impressive work !


March 9, 2010, 16:50 

#7  
Senior Member

Quote:
as I wrote you after the launch of The FOAM Documentation Project: Thanks a lot for all the work and effort you have put on documenting these toplevel solvers. I think it is really awesome work that really should be made available for the community! Quote:
Quote:
best, Holger
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Holger Marschall web: http://www.holgermarschall.info mail: holgermarschall@yahoo.de 

March 10, 2010, 13:13 

#8 
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Alberto Passalacqua
Join Date: Mar 2009
Location: Ames, Iowa, United States
Posts: 1,910
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Hi Holger.
Of course if a more organized project will be created/come back, as I hope, everything I write can be easily reused/adapted. In the meanwhile, I hope the wiki pages are of some help, especially to new users. Best,
__________________
Alberto Passalacqua GeekoCFD  A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats. OpenQBMM  An opensource implementation of quadraturebased moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using. 

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