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Sandia Flame D OpenFoam tutorial case - bad result?

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Old   September 5, 2019, 07:31
Default Sandia Flame D OpenFoam tutorial case - bad result?
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Hi there!

I am trying to study combustion modelling within OpenFoam and am currently looking into the Sandia Flame D case - /opt/openfoam6/tutorials/combustion/reactingFoam/RAS/SandiaD_LTS

I copy the case into my own directory and execute provided Allrun script.
The results of the temperature field at the last time step are shown in the first picture (myD).

However (to me) - these results seem to be incorrect. If you google Sandia D flame tutorial in openFoam you get these screenshots that make more sense in terms of results.

For example from the following thesis(http://repozitorij.fsb.hr/9279/1/Del..._diplomski.pdf), page 79 (picture D2) - the results are very different yet according to the information there the conditions are identical to those found in the OpenFoam tutorial case.

Also there is a paper (https://link.springer.com/article/10...494-014-9561-5) looking into Sandia D flames and their OpenFoam simulation looks as follows (D3).

So my question is do I need to work with the case and modify to achieve these more sensible results or is it just a simple question of post-processing -as I assume the in-built openFoam tutorial on this case is correct.

Thank you!
Attached Images
File Type: png myD.png (8.1 KB, 21 views)
File Type: png D2.PNG (53.0 KB, 21 views)
File Type: png D3.PNG (151.9 KB, 19 views)
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Old   September 6, 2019, 11:37
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Update on this -- I installed the most recent dev version of OpenFoam, which contains the updated Sandia Flame D tutorial and produces much better results.
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Old   September 11, 2019, 04:35
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Hi Brandani,

Would it be possible for you to share the updated results you mentioned? We are implementing the flamelet/progress variable approach in OpenFOAM, and obviously Flame D is one of the most used benchmark cases. I wonder what the results look like using the existing solvers in OpenFOAM.

Thanks!
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Old   September 11, 2019, 06:10
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Quote:
Originally Posted by cryabroad View Post
Hi Brandani,

Would it be possible for you to share the updated results you mentioned? We are implementing the flamelet/progress variable approach in OpenFOAM, and obviously Flame D is one of the most used benchmark cases. I wonder what the results look like using the existing solvers in OpenFOAM.

Thanks!
So just to clarify:

1) What I was saying is that SandiaD flame in OpenFOAM version 6 seemed to produce inaccurate results (I believe there was no ignition with the EDC combustion model - 1st picture in my first post)

2) Then, what I found is that the OpenFOAM development version (https://openfoam.org/version/dev/) + OpenFoam v7 (https://openfoam.org/release/7/) must have had their in-built tutorial on Sandia Flame D updated because there was ignition and results seem to match those pictures (2nd and 3rd) I attached in my first post

3) So install v7 or the dev version of OpenFOAM and you will have a working base case. I did not do any modifications to the case in these versions.

Hope this helps!
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Old   September 11, 2019, 06:14
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Quote:
Originally Posted by Brandani View Post
So just to clarify:

1) What I was saying is that SandiaD flame in OpenFOAM version 6 seemed to produce inaccurate results (I believe there was no ignition with the EDC combustion model - 1st picture in my first post)

2) Then, what I found is that the OpenFOAM development version (https://openfoam.org/version/dev/) + OpenFoam v7 (https://openfoam.org/release/7/) must have had their in-built tutorial on Sandia Flame D updated because there was ignition and results seem to match those pictures (2nd and 3rd) I attached in my first post

3) So install v7 or the dev version of OpenFOAM and you will have a working base case. I did not do any modifications to the case in these versions.

Hope this helps!
This is the T field at last time step produced by the in-built case in the dev version.
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