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Is there a theory guide for relativeVelocityModel in OpenFOAM.org?

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Old   September 13, 2022, 13:29
Default Is there a theory guide for relativeVelocityModel in OpenFOAM.org?
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Ivan Nepomnyashchikh
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Hello dear CFD community.


I'm using OpenFOAM 8 from OpenFOAM.org.


I'm trying to adapt the dahl tutorial for my needs. That tutorial is a part of the driftFluxFoam tutorials set.


The folder constant contains the file transportProperties. The file has the section named relativeVelocityModel. There are several coefficients that go into that model.


I would like to know what the formula for relativeVelocityModel used in OpenFOAM 8 is and what the coefficients used in the formula are. In other words, I need a theory guide for relativeVelocityModel.



For instance, ANSYS has two separate guides: the practical guide and the theory guide. I've been failing to find a theory guide for OpenFOAM. I'm wondering if there is one somewhere.


Reconstructing the theory from the code is cumbersome, the theory guide is desirable.


Thank you in advance.
Ivan
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Old   September 19, 2022, 13:55
Default My thoughts on the state of OpenFOAM.org
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Ivan Nepomnyashchikh
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I have found the solution.



I had to go through the code, trying to reconstruct the formulas. But the code doesn't contain literature references. I found literature references in the commits on GitHub. But often, you have to go to different versions of OpenFOAM to find the commit that contains the references. That was a nightmare.



Folks, I believe the situation with the theory behind OpenFOAM is bad. I conclude that right now only those how code OpenFOAM know what theory their code is based upon. If they leave, nobody will know what equatios OpenFOAM solves rendering it useless to some degree.



Not to mention that we are supposed to present equations we solve when publish CFD affiliated articles. How does one suppose to publish the equations where there is no official resource to get them from?


I have decided to start my blog on CFD online, where I'll be posting the theory behind OpenFOAM solvers. Since my Ph.D. dissertation is focusing on multiphase flows in general and drift flux model in particular, one shouldn't expect posts on the other OpenFOAM solvers from me. Moreover, I'm going to cover the theory only to the degree necessary for my needs (if you have additions, please, suggest them and I'll post them).



So for now, please find the answer to my current post in my blog.
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