Improved multipole broadband time-domain impedance boundary condition

X. Y. Li; X. D. Li; Christopher K.W. Tam

doi:10.2514/1.J051361

Improved multipole broadband time-domain impedance boundary condition

X. Y. Li^*
, X. D. Li
, Christopher K.W. Tam

^*Corresponding author for this work

School of Jet Propulsion
Florida State University

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

An improved multipole broadband time-domain impedance boundary condition was developed. The improved multipole impedance model is shown to satisfy the requirement of being real and passive. It also possesses an extra degree of freedom for fitting prescribed impedance data. It is more accurate and efficient in approximating a given liner impedance than the traditional multipole impedance model. The broadband time-domain impedance boundary condition is implemented by a piecewise linear recursive convolution technique. To validate the broadband time-domain impedance boundary condition, an analytical solution involving broadband acoustic wave propagation in two dimensions is derived. Numerical results show good agreement with analytical solutions.

Original language	English
Pages (from-to)	980-984
Number of pages	5
Journal	AIAA Journal
Volume	50
Issue number	4
DOIs	https://doi.org/10.2514/1.J051361
State	Published - Apr 2012
Externally published	Yes

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AB - An improved multipole broadband time-domain impedance boundary condition was developed. The improved multipole impedance model is shown to satisfy the requirement of being real and passive. It also possesses an extra degree of freedom for fitting prescribed impedance data. It is more accurate and efficient in approximating a given liner impedance than the traditional multipole impedance model. The broadband time-domain impedance boundary condition is implemented by a piecewise linear recursive convolution technique. To validate the broadband time-domain impedance boundary condition, an analytical solution involving broadband acoustic wave propagation in two dimensions is derived. Numerical results show good agreement with analytical solutions.

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Improved multipole broadband time-domain impedance boundary condition

Abstract

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