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Aeroacoustic simulation in OpenLB

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Viewing 6 posts - 1 through 6 (of 6 total)
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  • #5975
    adsier
    Participant

    Hello,

    In literature you can find many examples of using LBM for aeroacoustics. Commercial LBM solvers (mainly PowerFlow) were used in most of these calculations.

    My question is as follows – does OpenLB at the current level of code advancement allow such analyzes? If not, what’s missing?

    Regards,
    Adam

    #5977
    mathias
    Keymaster

    Dear Adam,

    incompressible, yes; compressible, no (here, is an LB model missing plus its implementation).

    Best
    Mathias

    #5979
    adsier
    Participant

    Dear Mathias,

    Thank you for quick reply.

    I am not sure if I understand your answer. I have some experience with N-S (RANS/URANS) solvers, but the LBM method is completely new for me.

    I thought that when we consider the aeroacoustic simulation in LBM method, we solve both the flow and acoustic propagation (direct CAA approach). The question is how it is possible if you make an assumption of incompressible flow? Or maybe I miss something?

    Specifically, I am interested in predicting noise generated by a quad-copter.

    Regards,
    Adam

    #5980
    mathias
    Keymaster

    You can use a wall-modelled LES approach in LBM.

    #5992
    adsier
    Participant

    Dear Mathias,

    Yes, I think that wall-modelled LES approach would be ok for this purpose.

    Coming back to the question about compressibility. In literature I found the following statement:

    The latttice-Boltzmann method is well-suited for the aeroacoustics applications since it is a Lagrangian
    method based on a stream-and-collide scheme, and is inherently unsteady and compressible and thus physically deals with sound pressure waves. (https://arc.aiaa.org/doi/10.2514/6.2016-2969)

    How does this relate to what you wrote about the possibility of performing analyzes as incompressible?

    Regards,
    Adam

    #6030
    mathias
    Keymaster

    One problem for practical applications are wall reflections on curved boundaries — I guess that this is not so easy..

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