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Acoustic Solver with openfoam

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Old   July 27, 2015, 08:26
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Quote:
Originally Posted by maHein View Post
I'm using OpenFOAM 2.4.0.

I'm currently rerunning the simulation with the correct settings. I can show you the results in a few days.

Regards,

Martin
Have you changed something in code for 2.4 or it has been compiled sucessfully without changes?
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Old   July 27, 2015, 09:01
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I programmed the Curle analogy from scratch for myself to understand the code better (and to have a start for Ffowcs-Williams-Hawkings...) Afterwards I compared the results with the implementation of Kraposhin - both are very similar.

I just improved the calculation of the distance surface-observer. Kraposhin only calculates an average distance and only for the first surface defined (even if more are specified). I am not sure why he did this simplification. I calculate the distance for each face of each defined surface, which is in my opinion more physical. But the results suggest, that this influence is minor in the end...

Regards,

Martin
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Old   July 27, 2015, 09:08
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Nice suggestion.

We shall implement it in our version. Sadly i didn't dig into Kraposhin code to save time for FWH. But your posts are very valuable. Thank you.

But i will say to Matvey what you did in the next time i will see him!
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Old   July 27, 2015, 09:26
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Are you already using Ffowcs-Williams Hawkings analogy for acoustics? What are your experiences in combination with openfoam?
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Old   July 27, 2015, 09:28
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It's still under development.
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Old   July 27, 2015, 10:20
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Do you have a (simple) case for validation, which includes moving walls?
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Old   July 28, 2015, 01:38
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We're using rod-airfoil case from Jacobs article.

But, as i learnt from publications the problems of such type (wind-tunnel) needs corrections. I think I can something say about it only later.
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Old   August 1, 2015, 09:27
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Quote:
Originally Posted by maHein View Post
I simulated the NASA tandem cylinder validation case using a Spalart Allmaras DDES turbulence model with a span length of 3 times the diameter. The results are quite satisfactory and similar to other publications on this case.

Hi,

Congratulations! That looks like good result.

I am wondering if you will be willing to share your case file, either publicly or privately, to jump start setup for novice like me? Thanks!
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Old   August 10, 2015, 10:45
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Yeah, sure. Write me a private message and I can send you the files.
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Old   August 14, 2015, 08:03
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You can download the case here:

(deleted)


Simply use snappyHexMesh for mesh generation as well as createPatch and changeDictionary. Finally, copy polyMesh to the simulation/constant folder. You just need a library for acoustic calculation.

Regards,

Martin

Edit:
I accidentally uploaded the wrong case folder. I will submit a correct version in the next days.
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Last edited by maHein; August 17, 2015 at 07:38.
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Old   August 18, 2015, 09:40
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Hello everybody,

you can download the tandem cylinder validation case using the following link;

https://www.dropbox.com/s/76wrtqvnv7...on.tar.gz?dl=0

Simply execute the Allrun.pre file to create the mesh using snappyHexMesh. You will also find a folder called acousticAnalogy (for OpenFOAM 2.4.0) containing the acoustic analogy of Curle used for postprocessing.

Have fun,

Martin
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Old   September 23, 2015, 04:00
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Hello all,
Thanks guys, for the effort you have put forward.
The link for the Tandem cylinder validation case is not working.

Please can anyone re-upload the case file.

Regards,
chaitanya

Last edited by chaitanyaarige; September 23, 2015 at 05:17.
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Old   September 24, 2015, 03:18
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Hello everybody,

I reuploaded the case files:

https://www.dropbox.com/s/ko0d87kyc1...on.tar.gz?dl=0

Regards,

Martin
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Old   October 29, 2015, 06:10
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Hi maHein,

I just get started to do acoustics analysis usingOpenFOAM. I found that you had successfully did the acoustic analysis with a very good result. Can you share the file with me. The link you have given in the previous post is not working.

Thanks.
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Old   November 17, 2015, 07:55
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I'm also interested in the above mentioned test case, so if the link could be reinstated, that would be great

Also, we are currently investigating using OpenFOAM as a tool to simulate noise using audio analogies. We have a quite decently equipped audio laboratory and we are very interested in providing validation measurement data for example for FW-H or Curle implementations.
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Old   November 26, 2015, 05:40
Default GitHub project libAcoustics
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Hi all!

We have uploaded a project on GitHub so you can download it and compile it for the latest release of the OpenFOAM toolkit.

https://github.com/unicfdlab/libAcou...OpenFOAM-3.0.0

We have included baffled-piston case for validation but it's not fully tested yet. If you're interested in validation of the acoustics codes, you're welcome for collaboration.


The present version of the libAcoustics includes only Curle analogy.

Thank You.
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Old   November 29, 2015, 08:40
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Greetings to all!

@skeptik: I've started a simple wiki page at openfoamwiki.net for this project: https://openfoamwiki.net/index.php/Contrib/libAcoustics

The wiki page can be edited by anyone who is registered at openfoamwiki.net, so please feel free to contribute there with documentation as well, in case you're not able to contribute code and/or validation of the library.

Best regards,
Bruno
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Old   November 30, 2015, 02:19
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Quote:
Originally Posted by wyldckat View Post
Greetings to all!

@skeptik: I've started a simple wiki page at openfoamwiki.net for this project: https://openfoamwiki.net/index.php/Contrib/libAcoustics

The wiki page can be edited by anyone who is registered at openfoamwiki.net, so please feel free to contribute there with documentation as well, in case you're not able to contribute code and/or validation of the library.

Best regards,
Bruno
So wow. Thank You. We will talk about it in our group. At least I will try to fill this wikipage about validation as soon as It will succeed.
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Old   January 29, 2016, 11:51
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Good evening,
I would like you to take a look at this please.
3D Acoustics with symmetry plane
regards.
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Old   February 4, 2016, 04:06
Default Acoustic Solver in OpenFOAM
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Dear wyldckat,

Thanks for the acoustic model implementation in Openfoam, Do you have example of how to solve this model in openfoam?

If so please share it with me.

Best Regards,
Sandeep Patil
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