### 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 |
---|---|

Pages (from-to) | 359-366 |

Number of pages | 8 |

Journal | Computational Mechanics |

Volume | 31 |

Issue number | 3-4 |

Publication status | Published - 2003 Jul 1 |

### Fingerprint

### Keywords

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

### ASJC Scopus subject areas

- Mechanics of Materials
- Computational Mechanics
- Applied Mathematics
- Safety, Risk, Reliability and Quality

### Cite this

*Computational Mechanics*,

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

**Aeroacoustic tonal noise prediction of open cavity flows involving feedback.** / Moon, Young June; Seo, J. H.; Koh, S. R.; Cho, Y.

Research output: Contribution to journal › Article

*Computational Mechanics*, vol. 31, no. 3-4, pp. 359-366.

}

TY - JOUR

T1 - Aeroacoustic tonal noise prediction of open cavity flows involving feedback

AU - Moon, Young June

AU - Seo, J. H.

AU - Koh, S. R.

AU - Cho, Y.

PY - 2003/7/1

Y1 - 2003/7/1

N2 - 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.

AB - 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.

KW - Computational aero-acoustics

KW - Feedback

KW - Open cavity

KW - Tonal noise

UR - http://www.scopus.com/inward/record.url?scp=0141519213&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0141519213&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0141519213

VL - 31

SP - 359

EP - 366

JO - Computational Mechanics

JF - Computational Mechanics

SN - 0178-7675

IS - 3-4

ER -