Impedance boundary conditions for time-domain computational aeroacoustics methods

Yusuf Özyörük, Lyle Norman Long

Research output: Contribution to conferencePaper

2 Citations (Scopus)

Abstract

A time-domain impedance condition method has been developed for computational aeroacoustics applications. The basis for this method is the standard impedance condition stated in the frequency domain as the particle displacement continuity equation. The development of the time-domain impedance condition follows the relations among the frequency, z-, and discrete-time domains and a rational function representation of the impedance in the z-domain. The resultant impedance condition is finite, infinite-impulse-response type, digital filter operations in the time-domain, which is suitable to CAA methods. This paper describes the present approach and discusses the time-domain numerical simulations of the NASA Langley flow-impedance tube with a constant depth ceramic tubular liner. Excellent agreement is shown with experimental data at various frequencies and flow conditions.

Original languageEnglish (US)
Pages1-13
Number of pages13
StatePublished - Jan 1 1997
Event35th Aerospace Sciences Meeting and Exhibit, 1997 - Reno, United States
Duration: Jan 6 1997Jan 9 1997

Other

Other35th Aerospace Sciences Meeting and Exhibit, 1997
CountryUnited States
CityReno
Period1/6/971/9/97

Fingerprint

Computational aeroacoustics
computational aeroacoustics
Acoustic impedance
Rational functions
Digital filters
Impulse response
NASA
boundary condition
Boundary conditions
impedance
boundary conditions
Computer simulation
liner
ceramics
rational functions
digital filters
continuity equation
linings
method
filter

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Özyörük, Y., & Long, L. N. (1997). Impedance boundary conditions for time-domain computational aeroacoustics methods. 1-13. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.
Özyörük, Yusuf ; Long, Lyle Norman. / Impedance boundary conditions for time-domain computational aeroacoustics methods. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.13 p.
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Özyörük, Y & Long, LN 1997, 'Impedance boundary conditions for time-domain computational aeroacoustics methods' Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States, 1/6/97 - 1/9/97, pp. 1-13.

Impedance boundary conditions for time-domain computational aeroacoustics methods. / Özyörük, Yusuf; Long, Lyle Norman.

1997. 1-13 Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.

Research output: Contribution to conferencePaper

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N2 - A time-domain impedance condition method has been developed for computational aeroacoustics applications. The basis for this method is the standard impedance condition stated in the frequency domain as the particle displacement continuity equation. The development of the time-domain impedance condition follows the relations among the frequency, z-, and discrete-time domains and a rational function representation of the impedance in the z-domain. The resultant impedance condition is finite, infinite-impulse-response type, digital filter operations in the time-domain, which is suitable to CAA methods. This paper describes the present approach and discusses the time-domain numerical simulations of the NASA Langley flow-impedance tube with a constant depth ceramic tubular liner. Excellent agreement is shown with experimental data at various frequencies and flow conditions.

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Özyörük Y, Long LN. Impedance boundary conditions for time-domain computational aeroacoustics methods. 1997. Paper presented at 35th Aerospace Sciences Meeting and Exhibit, 1997, Reno, United States.