A time-domain implementation of surface acoustic impedance condition with and without flow

Yusuf Özyörük, Lyle Norman Long

Research output: Contribution to conferencePaperpeer-review

35 Scopus citations


The impedance condition in computational aeroacoustic applications is required in order to model acoustically treated walls. The application of this condition in time-domain methods, however, is extremely difficult because of the convolutions involved. In this paper, a timedomain method is developed which overcomes the computational difficulties associated with these convolutions. This method builds on the z-transform from control and signal processing theory and the z-domain model of the impedance. The idea of using the z-domain operations originates from the computational electromagnetics community. When the impedance is expressed in the zdomain with a rational function, the inverse z-transform of the impedance condition results in only infinite impulse response type, digital, recursive filter operations. These operations, unlike convolutions, require only limited past-time knowledge of the acoustic pressures and velocities on the surface. One- and two-dimensional example problems with and without flow indicate that the method promises success for aeroacoustic applications.

Original languageEnglish (US)
StatePublished - Jan 1 1996
Event2nd AIAA/CEAS Aeroacoustics Conference, 1996 - State College, United States
Duration: May 6 1996May 8 1996


Other2nd AIAA/CEAS Aeroacoustics Conference, 1996
Country/TerritoryUnited States
CityState College

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Aerospace Engineering


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