Wiki solver guides
Hi,
a few days ago I updated the following guides on the wiki, for those interested:
This is part of the content that should have gone in the documentation project, and the structure used for the guides is very similar to what was the structure of the documents that should have become part of it. Since it did not work out for the reasons we know, I decided to put on the wiki the part of the material I was working on. Keeping it on my hard drive was not helping anybody. :) More will come in some time, since rearranging the format is all but fun (no LaTeX macros can be defined to my knowledge on the wiki. If you know a way, please share :D). Best, |
Hi Alberto,
I've seen you're other thread about these same guides, but only just recently saw this thread... Quote:
In the mean time, I'm still hanging on to the idea of linking up openfoamwiki.net with -extend's SVN in sourceforge... i.e., putting the LaTeX PDF/PS (and even source) versions in the SVN, and making a link to them in the respective solver page in the wiki ;) Best regards, Bruno |
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Best, |
Thanks for the guides. They are much appreciated.
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First of all, thanks for this contribution. It's a really great job!
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Hello,
that solver is not among those I considered to document. Hopefully someone else will contribute the documentation for it, or you could write it if you decide to study how it works. Best, |
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Thanks for your replay, sorry to read it unfortunately, but maybe something will come up due to another thread. Who knows maybe new solver guide :) |
That would be nice :-)
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typo, bug or not understood
Hello Alberto,
Thanks for the many contribution to this forum. I was reading the code in the wiki page on bubblefoam and in Ueqns.H I came across: UbEqn = ... Cvm*rhob*alpha/rhob .... should this not be: ... Cvm*rhoa*alpha/rhob ... ? I found in OF-1.7.0 of CAElinux that this statement is also in twoPhaseEulerFoam, same .H file? Best regards Wouter |
I think it is correct as it is, the virtual mass force is given by
Cvm * rho_continuous_phase * ... in the literature. |
Thanks,
I assume I am wrong again if I say that rhob can be removed then altogether? :o best regards Wouter |
You are actually right. I think they left to make the code readable, or because they cut and paste Ua, and replaced ;-)
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hi alberto , I am reading the bubblefoam guides it is very usefull, i thingk there is a mistake in governing equtation of momenton , the Reynolds stress tensor term shuold not have the density rou?
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Hi and thanks for the comment.
I don't think the density should appear, since it is assumed to be constant, and the momentum equation is divided by the phase density (note that the kinematic viscosity is used). Best, |
hi, I mean that in section 3.2 the third and fourth term in momentum eqution is obvious not dimemsion balance ?
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Thanks. I fixed it :-)
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Hi alberto, recently I run the tutorial bed2(the bubble bed) used twoPhaseEulerFoam, I found that the max volume fraction of the solid will larger than the alphaMax, the alphaMax is 0.62 and alpha actually can reach 0.73? I've turned on the PackingLimter . So what is the problem? can you give me some suggestion? Thank you.
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Hi, that's an issue on how the particle pressure is managed if you use the kinetic theory. If you take a look at the code, it is treated explicitly.
As discussed elsewhere, I proposed a fix to this problem, but it's not released yet. |
So do you mean that in this version(2.1.0), the foam cannot avoid this problem ? I used Gidsaspow's radial function, the solid pressure will be large when alpha approach the alphaMax to avoid the problem in physcially. So can you give me a hint about how you fix the problem. Thanks a lot.
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The typical approach to enforce the packing limit is to:
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