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Poor Correlation of compressibleInterFoam for Water-Air Mixture in Vertical Pipe |
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June 29, 2015, 13:09 |
Poor Correlation of compressibleInterFoam for Water-Air Mixture in Vertical Pipe
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#1 |
New Member
Colin
Join Date: Mar 2015
Location: UK
Posts: 3
Rep Power: 11 |
Hi everyone,
I’m looking to share some results and seek some ideas for a problem that I’m having when correlating OpenFOAM against experimental predictions with compressibleInterFoam. The experiment was performed on a 4m vertical pipe with a 90 degree bend at the top (see image attached). The air-water mixture entered at the bottom of the pipe and developed into an “intermittent” or “churn” flow regime before reaching the bend. Note that this is a similar flow regime to “slugging” and occurs when the gas volume flowrate is higher than the liquid volume flowrate. Initially, the experiment was replicated in CCM+ and good correlation was achieved in terms of liquid distributions and force measurements on the bend. Replicating the study in OpenFOAM was less successful – the liquid distribution is significantly different (“annular” rather than “intermittent” flow) and, subsequently, the bend forces are reduced. The flowfields from CCM+ and OpenFOAM 2.3.1 are presented in the attached file. I realise that you’ll need more information to give this a full diagnosis but here are the key ingredients:
In order to improve the correlation, I’ve applied a few tweaks to the method but have not seen much improvement:
At this stage, I’m just wondering if anyone has done a similar correlation exercise and whether they were successful? Published literature is obviously minimal but any references would also be appreciated, and I can provide more information of my setup if required. Are there any know limitations of compressibleInterFoam in respect of this type of problem? Kind regards, Colin |
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June 30, 2015, 09:27 |
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#2 |
Senior Member
Olivier
Join Date: Jun 2009
Location: France, grenoble
Posts: 272
Rep Power: 18 |
hello,
I have some interest for this. Could you provide your fvScheme & fvSolution ? and ideally, can you share your experimental data ? regards, olivier |
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December 3, 2015, 23:04 |
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#3 |
New Member
Jue Wang
Join Date: Apr 2014
Posts: 23
Rep Power: 12 |
Hi,
I'm also interested in compressibleInterFoam. But I failed to setup the solver with turbulent model. Did you mean you applied LES model for compressibleInterFoam? If so, how did you modified the fvscheme and fvsolution files? Besides, have you ever tried RAS model for compressibleInterFoam? Thank you. Joe |
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February 24, 2016, 08:00 |
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#4 |
New Member
Colin
Join Date: Mar 2015
Location: UK
Posts: 3
Rep Power: 11 |
Please find attached the fvSchemes and fvSolution as requested.
I have only looked at LES in detail. Laminar and k-e were also considered but did not improve the solution. As an update to the orginal post: refining the mess in the cross-sectional plane from ~500 to ~2000 gave a good match to experimental data, with all of the settings in the original post and the fvSchemes/fvSolution attached. |
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February 29, 2016, 05:24 |
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#5 |
Senior Member
Olivier
Join Date: Jun 2009
Location: France, grenoble
Posts: 272
Rep Power: 18 |
hello,
In your setting you use gauss upwind (1 order) for a LES model ! If refining your mesh give you better result, then you really need to check your mesh. By the way, how fine is your mesh ? tetra or hexa type ? This may change a lot of things. regards, olivier |
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March 2, 2016, 08:43 |
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#6 |
Senior Member
Markus Rehm
Join Date: Mar 2009
Location: Erlangen (Germany)
Posts: 184
Rep Power: 17 |
Hi Colin,
is it the same case you posted here ? http://www.cfd-online.com/Forums/ope...ical-pipe.html Regards, Markus |
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August 8, 2019, 16:43 |
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#7 |
New Member
Felipe Chagas
Join Date: Feb 2019
Posts: 11
Rep Power: 7 |
Does anyone know if Colin has published his work, a dissertation or a paper, maybe?
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Tags |
compressibleinterfoam, openfoam 2.3.1, slug flow, vertical pipe, water and air |
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