Acoustic Solver with openfoam

skeptik · July 27, 2015, 09:26

Quote:

Originally Posted by maHein

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?

maHein · July 27, 2015, 10:01

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

skeptik · July 27, 2015, 10:08

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!

maHein · July 27, 2015, 10:26

Are you already using Ffowcs-Williams Hawkings analogy for acoustics? What are your experiences in combination with openfoam?

skeptik · July 27, 2015, 10:28

It's still under development.

maHein · July 27, 2015, 11:20

Do you have a (simple) case for validation, which includes moving walls?

skeptik · July 28, 2015, 02:38

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.

f0208secretx · August 1, 2015, 10:27

Quote:

Originally Posted by maHein

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!

maHein · August 10, 2015, 11:45

Yeah, sure. Write me a private message and I can send you the files.

maHein · August 14, 2015, 09:03

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.

maHein · August 18, 2015, 10:40

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

chaitanyaarige · September 23, 2015, 05:00

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

maHein · September 24, 2015, 04:18

Hello everybody,

I reuploaded the case files:

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

Regards,

Martin

mali · October 29, 2015, 07:10

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.
-mali-

zordiack · November 17, 2015, 08:55

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.

skeptik · November 26, 2015, 06:40

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.

wyldckat · November 29, 2015, 09:40

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

skeptik · November 30, 2015, 03:19

Quote:

Originally Posted by wyldckat

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.

a_habib · January 29, 2016, 12:51

Good evening,
I would like you to take a look at this please.
3D Acoustics with symmetry plane
regards.

srp1220 · February 4, 2016, 05:06

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

July 27, 2015, 10:01		#62
maHein Member Join Date: Jun 2012 Posts: 76 Rep Power: 14	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 Alhasan, guanjiang.chen and Van Thuan Hoang like this.

July 27, 2015, 10:08		#63
skeptik Member Ilya Join Date: Dec 2011 Location: Russia Posts: 97 Blog Entries: 41 Rep Power: 15	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! __________________ practice makes perfect

July 27, 2015, 10:28		#65
skeptik Member Ilya Join Date: Dec 2011 Location: Russia Posts: 97 Blog Entries: 41 Rep Power: 15	It's still under development. chaitanyaarige likes this. __________________ practice makes perfect

July 28, 2015, 02:38		#67
skeptik Member Ilya Join Date: Dec 2011 Location: Russia Posts: 97 Blog Entries: 41 Rep Power: 15	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. guanjiang.chen likes this. __________________ practice makes perfect

August 10, 2015, 11:45		#69
maHein Member Join Date: Jun 2012 Posts: 76 Rep Power: 14	Yeah, sure. Write me a private message and I can send you the files. skeptik and guanjiang.chen like this.

July 27, 2015, 10:26		#64
maHein Member Join Date: Jun 2012 Posts: 76 Rep Power: 14	Are you already using Ffowcs-Williams Hawkings analogy for acoustics? What are your experiences in combination with openfoam?

July 27, 2015, 11:20		#66
maHein Member Join Date: Jun 2012 Posts: 76 Rep Power: 14	Do you have a (simple) case for validation, which includes moving walls?

August 14, 2015, 09:03		#70
maHein Member Join Date: Jun 2012 Posts: 76 Rep Power: 14	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. f0208secretx likes this. Last edited by maHein; August 17, 2015 at 08:38.

August 18, 2015, 10:40		#71
maHein Member Join Date: Jun 2012 Posts: 76 Rep Power: 14	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 Alhasan, chaitanyaarige and jaroshh like this.

September 23, 2015, 05:00		#72
chaitanyaarige New Member Chaitanya Join Date: Aug 2013 Location: Mumbai Posts: 18 Rep Power: 13	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 06:17.

September 24, 2015, 04:18		#73
maHein Member Join Date: Jun 2012 Posts: 76 Rep Power: 14	Hello everybody, I reuploaded the case files: https://www.dropbox.com/s/ko0d87kyc1...on.tar.gz?dl=0 Regards, Martin waku2005 and chaitanyaarige like this.

October 29, 2015, 07:10		#74
mali Member Join Date: Mar 2009 Location: adelaide, SA, Australia Posts: 32 Rep Power: 17	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. -mali- __________________ *mali*

November 17, 2015, 08:55		#75
zordiack Member Pekka Pasanen Join Date: Feb 2012 Location: Finland Posts: 87 Rep Power: 14	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.

November 26, 2015, 06:40	GitHub project libAcoustics	#76
skeptik Member Ilya Join Date: Dec 2011 Location: Russia Posts: 97 Blog Entries: 41 Rep Power: 15	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. wyldckat, Attesz, fumiya and 5 others like this. __________________ practice makes perfect

November 29, 2015, 09:40		#77
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,981 Blog Entries: 45 Rep Power: 128	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 ArathoN, Sethu, johnkh and 2 others like this.

January 29, 2016, 12:51		#79
a_habib Member Ahmad Habib Join Date: Nov 2014 Location: Aleppo, Syria Posts: 53 Rep Power: 12	Good evening, I would like you to take a look at this please. 3D Acoustics with symmetry plane regards.

February 4, 2016, 05:06	Acoustic Solver in OpenFOAM	#80
srp1220 New Member Sandeep Patil Join Date: Feb 2016 Posts: 2 Rep Power: 0	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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