TY - CONF
T1 - Impedance boundary conditions for time-domain computational aeroacoustics methods
AU - Özyörük, Yusuf
AU - Long, Lyle N.
N1 - Funding Information:
Tills work was iuppocted by the NASA Langley Research Center grant NAG-1-1367. The computational rewources (CM-5) were provided by the National Center for Super computing Application* at the University of Illinois at Urbana-Champaign. The authors would tike to thank M. (J. Jones and T. L. Pariott of the NASA Langley Research Center for useful discussions and providing the experimental data used In this paper.
Publisher Copyright:
© 1997, American Institute of Aeronautics and Astronautics, Inc.
PY - 1997
Y1 - 1997
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.
AB - 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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M3 - Paper
AN - SCOPUS:84982318537
SP - 1
EP - 13
T2 - 35th Aerospace Sciences Meeting and Exhibit, 1997
Y2 - 6 January 1997 through 9 January 1997
ER -