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Prediction of Sound Generated by Complex Flows at Low Mach Numbers

Khalighi, Yaser ; Mani, Ali ; Ham, Frank ; Moin, Parviz

AIAA journal, 2010-02, Vol.48 (2), p.306-316 [Periódico revisado por pares]

Reston, VA: American Institute of Aeronautics and Astronautics

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  • Título:
    Prediction of Sound Generated by Complex Flows at Low Mach Numbers
  • Autor: Khalighi, Yaser ; Mani, Ali ; Ham, Frank ; Moin, Parviz
  • Assuntos: Acoustics ; Aeroacoustics, atmospheric sound ; Aircraft ; Boundary layer ; Exact sciences and technology ; Fluid dynamics ; Fundamental areas of phenomenology (including applications) ; Noise (turbulence generated) ; Physics ; Rotational flow and vorticity ; Separated flows ; Turbulent flow ; Turbulent flows, convection, and heat transfer
  • É parte de: AIAA journal, 2010-02, Vol.48 (2), p.306-316
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
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  • Descrição: We present a computational aeroacoustics method to evaluate sound generated by low Mach number flows in complex configurations in which turbulence interacts with arbitrarily shaped solid objects. This hybrid approach is based on Lighthill's acoustic analogy in conjunction with sound source information from an incompressible calculation. In this method, Lighthill's equation is solved using a boundary element method that allows the effect of scattered sound from arbitrarily shaped solid objects to be incorporated. We present validation studies for sound generated by laminar and turbulent flows over a circular cylinder at Re = 100 and 10,000, respectively. Our hybrid approach is validated against directly computed sound using a high-order compressible flow solver as well as the solution of the Ffowcs Williams and Hawkings equation in conjunction with compressible sound sources. We demonstrate that the sound predicted by a second-order hybrid approach is as accurate as sound directly computed by a sixth-order compressible flow solver in the frequency range in which low-order numerics can accurately resolve the flow structures. As an example of an engineering problem, we calculated the sound generated by flow over an automobile side-view mirror and compared it to experimental measurements. [PUBLICATION ABSTRACT]
  • Editor: Reston, VA: American Institute of Aeronautics and Astronautics
  • Idioma: Inglês;Chinês
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