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#1 |
New Member
Sergej
Join Date: Aug 2015
Location: Cologne, Germany
Posts: 10
Rep Power: 9 ![]() |
Hello everybody,
i am new at OpenFoam, but i read much theory of it and now I would like to implement the Acoustic Perturbation Equations (APE) in OpenFoam. I think it would not be very easy, so i hope that maybe somebody here have made experience with it. Here is the relevante paper link: http://www.sciencedirect.com/science...21999103001682 If you are a student, then it is mybe for free, if you log in with VPN of your university. So if i get some experience with it i will share it here. |
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#2 |
Senior Member
Hasan K.J.
Join Date: Dec 2011
Location: Bristol, United Kingdom
Posts: 200
Rep Power: 14 ![]() |
Dear Tonky,
By any chance did you have any luck in implementing APE in OpenFOAM. Regards, Hasan K.J
__________________
"Real knowledge is to know the extent of one's ignorance." - Confucius |
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#3 |
New Member
Sergej
Join Date: Aug 2015
Location: Cologne, Germany
Posts: 10
Rep Power: 9 ![]() |
Hello Hasan,
after some practice with OF, I have started to work further on the implementation of APE-2 theory. But now I am facing some problems, which I am now trying to solve, also with the help of cfd-online.com. I noticed that the equations of "APE-2" are similar to the equations of Seo and Moon in "Linearized Perturbed Compressible Equations": http://www.cfd-online.com/Wiki/Hydro...stic_splitting But my problem is now that i implemented the following three equations (see attached files) and I am solving them on the explicit way (diagonal solver) and the values of rho' and u' are increasing during the simulation without a limit. Now I am trying to implement them on the implicit way. Is this possible and if yes, how? Hasan, did you have some experience with APE? |
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#4 |
New Member
Sergej
Join Date: Aug 2015
Location: Cologne, Germany
Posts: 10
Rep Power: 9 ![]() |
Hello Foamers,
I have read many posts here in cfd-online, but could not solve my problems with the iterations with the number of zero. I implemented the three equations in the following form: Code:
solve(fvm::ddt(rhoS)+ rhoS * (fvc::div(averageU)) == - rho * (fvc::div(Ua)) ); Code:
solve(fvm::ddt(Ua)+ fvc::grad(averageU & Ua) == - fvc::grad(pa)); Code:
solve(rho*fvm::ddt(pa)- c0*c0*fvc::ddt(rhoS) == - rho*fvc::ddt(pS)); |
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#5 | |
New Member
Join Date: Jan 2018
Posts: 10
Rep Power: 7 ![]() |
I'm getting in trouble with APE in OpenFOAM too...Thanks!
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Tags |
acoustic, aeroacoustics, implementation, open foam, perturbation equations |
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