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A numerical study of transient flow around a cylinder and aerodynamic sound radiation

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Thermophysics and Aeromechanics Aims and scope

Abstract

The fully 3D turbulent incompressible flow around a cylinder and in its wake at a Reynolds number Re = = 9×104 based on the cylinder diameter and Mach number M = 0.1 is calculated using Large Eddy Simulations (LES). Encouraging results are found in comparison to experimental data for the fluctuating lift and drag forces. The acoustic pressure in far-field is commutated through the surface integral formulation of the Ffowcs Williams and Hawkings (FWH) equation in acoustic analogy. Five different sound sources, the cylinder wall and four permeable surfaces in the flow fields, are employed. The spectra of the sound pressure are generally in quantitative agreement with the measured one though the acoustic sources are pseudo-sound regarding the incompressible flow simulation. The acoustic component at the Strouhal number related to vortex shedding has been predicted accurately. For the broad band sound, the permeable surfaces in the near wake region give qualitative enough accuracy level of predictions, while the cylinder wall surface shows a noticeable under-prediction. The sound radiation of the volumetric sources based on Lighthill tensors at vortex shedding is also studied. Its far-field directivity is of lateral quadrupoles with the weak radiations in the flow and cross-flow directions.

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Authors and Affiliations

  1. Zhejiang Normal University, Jinhua, China

    J.-C. Cai, A. Kryzhanovskyi & S.-J. E

  2. The University of Western Australia, Perth, Australia

    J. Pan

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  1. J.-C. Cai
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  2. J. Pan
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Correspondence to J.-C. Cai.

Additional information

The authors are grateful for the financial support of the National Natural Science Foundation of China (Grant No. 51306163), the Zhejiang Provincial Natural Science Foundation of China (Grants Nos. LY18E060006 and LQ13E060001), and the CRC for Infrastructure Engineering Asset Management (CIEAM) of Australia.

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Cai, JC., Pan, J., Kryzhanovskyi, A. et al. A numerical study of transient flow around a cylinder and aerodynamic sound radiation. Thermophys. Aeromech. 25, 331–346 (2018). https://doi.org/10.1134/S0869864318030022

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  • DOI: https://doi.org/10.1134/S0869864318030022

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