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February 25, 2011, 12:18 |
Acoustic Solver with openfoam
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#1 |
New Member
Tijery
Join Date: Jan 2011
Posts: 25
Rep Power: 15 |
Hallo ,
I working on the field of Computational Aero acoustics. I would like to develop on Acoustic solve for the data from CFX, How long it would be reasonalble to choose openfoam . suggest me I am new to openfoam !! |
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March 31, 2013, 17:22 |
Any Success
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#2 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
hey have you had any success with Aeroacustics in openFOAM by anychance..??? |
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April 1, 2013, 05:06 |
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#3 |
Member
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Hi!
I'm taking part in project which concerns with developing acoustic library for OF. Today we have good results using Curle analogue but it's still tested on different cases. Later, Lighthill analogue may be realized as part of this library. There are a lot of papers concerning with acoustic applications of the OF in the Internet. If you're newbie in OF, i recommend you to study LES and later, when you'll get a little experience, start to learn OF Programmers Guide.
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practice makes perfect |
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April 1, 2013, 08:31 |
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#4 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
hey, ilya
i have been working with openFOAM for a year now and i have done enough RANS simulations and lil bit of LES, i would just like to know - if i have to develop a postprocessing tool to convert the velocity fields into sound of some sort or is there any tool available to do this - or develop a solver ? so solve for the sound - or can i export the data to fluent to convert the velocity feilds in to sound thanks, hasan |
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April 1, 2013, 08:43 |
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#5 |
Member
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The library's developed in the ISP RAS uses Curle analogue which needs to calculate the force by which body penetrate to the media.
As the output it has acoustic pressure p' obtained from results of the LES simulations, so i think there is no need to develop new solver. Unfortunately, I don't really know when library will be completed and opened for foamers.
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practice makes perfect |
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April 1, 2013, 09:27 |
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#6 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
im still not getting the idea...!!!! so after the LES simulations has been run.. the acoustic p will be calculated or during the LES simulation it will be calculated
thanks, hasan. |
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April 1, 2013, 09:46 |
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#8 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
lets hope the public release of this would be in a month or so ..
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March 17, 2020, 05:16 |
with which equations?
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#9 |
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niewiemnic
Join Date: Jan 2018
Location: Niemcy
Posts: 80
Rep Power: 8 |
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March 17, 2020, 11:34 |
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#10 |
New Member
Alireza Maleki
Join Date: Aug 2017
Location: United State
Posts: 20
Rep Power: 8 |
Hi
I do not think so. Using LEE to simulate the propagation of acoustic signals is much complicated and even the Ansys software does not use this method. I far as I know, this library uses integral surface methods to simulate the acoustic signals. Integral surface methods, like Farassat or Kirchhoff method, use a data surface to simulate the signal. I hope it would be helpful |
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May 4, 2020, 13:18 |
digitef-dev-1912?
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#11 |
Member
niewiemnic
Join Date: Jan 2018
Location: Niemcy
Posts: 80
Rep Power: 8 |
Hi,
I want to use this code https://github.com/unicfdlab/libAcoustics but does anybody know where can I find digitef-dev-1912? "OpenFOAM+ v.1912 is in the digitef-dev-1912 branch of the repository" |
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May 29, 2020, 08:11 |
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#12 |
New Member
Mustafa
Join Date: Jun 2015
Location: Aachen
Posts: 26
Rep Power: 10 |
@spalartallmaras just click on branch on the left and in the dropdown select the 1912 repo instead of the master
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November 14, 2013, 12:42 |
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#13 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
Hey ilya,
By any chance curle analog that you were working on released ? and also by any chance do you have any experience with Acoustics in Fluent ? ? Kind Regards, Hasan K.J |
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November 15, 2013, 01:22 |
Answer
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#14 | |
Member
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Quote:
Complex online post-processing: How to implement simple acoustic analogy in OpenFOAM (Sergei Strizhak, Matvey Kraposhin) 2. I know nothing about acoustics in Fluent or CFX except that using it you can get also wrong results.
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practice makes perfect |
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November 15, 2013, 08:53 |
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#15 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
Hi Ilya,
Thanks for the files i really appreciate it Will take two or three days to study it well - But which site or where can i keep up with the updates ? of this simple acoustic analogy ??? - i notice you have a lot of experience with airfoils For some reason I am getting wrong Cp when i manually try to plot it - what equation and how do you extract the data to plot Cp Kind Regards, Hasan Last edited by Alhasan; November 15, 2013 at 13:29. |
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November 16, 2013, 16:03 |
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#16 | |
Member
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Quote:
I use standart formulas from wikipedia. You should take care about pressure dimension when you use incompressible solver.
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practice makes perfect |
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November 17, 2013, 14:58 |
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#17 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
Hey Ilya,
Small doubt - By any chance do you know the probe frequency ? what it stands for - so for P0 in the Cp equation if i use 0 the graph makes sense … but i thought openFOAM used 101325 as default pressure ? is it not ..? Thanks Hasan K.j Last edited by Alhasan; November 21, 2013 at 20:53. |
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January 7, 2014, 16:23 |
noise utility in openfoam
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#18 |
New Member
Eslam Hashem Mohamed
Join Date: Oct 2013
Location: Cairo,Egypt
Posts: 13
Rep Power: 12 |
Hello skeptik,
I want ask for noise utility in openfoam, when i use it , i will need to use any other functionobject such as 'curlefunctionObject' or not. in other words, can noise utility be an alternative approach than acoustic analogy. i will be grateful if you answer my questions |
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January 7, 2014, 16:30 |
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#19 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 15 |
Hey Eslam,
I am not getting your question ? It will be helpful if you explain what you are trying to do ? Because what Ilya has shared with us here is an acoustic analogy namely Curle's analogy it has been validated and i have double checked it Regards, Hasan K.J |
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January 7, 2014, 17:09 |
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#20 |
New Member
Eslam Hashem Mohamed
Join Date: Oct 2013
Location: Cairo,Egypt
Posts: 13
Rep Power: 12 |
P { margin-bottom: 0.08in; } Dear Alhasan,
there is a new utility in open foam called noise utility in openfoam 2.2.0 , i asked does this utility may be an alternative tool rather than implementing an acoustic analogy i.e curle's analogy or Ffowcs-Williams and Hawkings [FW-H] |
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