### Abstract

A new hydrodynamic/acoustic splitting method is employed to predict aeroacoustic tonal noise of self-sustained oscillatory flows over the open cavity at low Mach numbers. Acoustic field is computed using a sixth-order compact scheme and a fourth-order Runge-Kutta method, with acoustic sources obtained from the unsteady incompressible Navier-Stokes calculation. First, numerical accuracy of the present splitting method is assessed for the aeolian tone generated by Karman vortex shedding from a circular cylinder at Re_{D} = 200 and M_{∞} = 0.3. A direct comparison was made with solutions of direct acoustic numerical simulation (DaNS) and Curle's acoustic analogy. The fundamental mode characteristics of the cavity flows at (i) Re_{δ*} = 850 and M_{∞} = 0.077 and (ii) Re_{δ*} = 1620 and M_{∞} = 0.147 are examined by the present method, verifying the solution with the experimentally measured sound pressure level (SPL) spectra. A dual tone characteristic observed in experiment (Henderson 2000) for case (i) is also confirmed computationally by the present method.

Original language | English |
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Pages (from-to) | 359-366 |

Number of pages | 8 |

Journal | Computational Mechanics |

Volume | 31 |

Issue number | 3-4 |

Publication status | Published - 2003 Jul |

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### Keywords

- Computational aero-acoustics
- Feedback
- Open cavity
- Tonal noise

### ASJC Scopus subject areas

- Computational Mechanics
- Ocean Engineering
- Mechanical Engineering
- Computational Theory and Mathematics
- Computational Mathematics
- Applied Mathematics

### Cite this

*Computational Mechanics*,

*31*(3-4), 359-366.