Non-reflecting boundary conditions for one-step LBM simulation of aeroacoustics

E. W S Kam, R. M C So, Chi Kin Randolph Leung

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

3 Citations (Scopus)

Abstract

The lattice Boltzmann method (LBM) has been proposed for one-step aeroacoustics simulations because the method only involves the solution of one scalar equation and hence it is relatively simple. In order that this method could be used effectively, appropriate non-reflecting boundary conditions for open computational boundaries have to be developed. Up to now, only one non-reflecting boundary condition has been proposed and that is the extrapolation method. On the other hand, four different non-reflecting boundary conditions are commonly used with direct numerical simulations (DNS) for one-step aeroacoustics calculations. Among these are the characteristics-based method, the perfectly matched layer method, the C1 continuous method, and the absorbing layer method. Not all these non-reflecting boundary conditions are applicable when used with LBM; some might not be appropriate while others could be rather effective. Those four non-reflecting boundary conditions plus the extrapolation method, their appropriateness and their suitability for LBM, are examined in this paper. The assessment is made against two classic aero-acoustic problems; propagation of a plane pressure pulse and an acoustic, entropy and vortex pulses. A reference solution is obtained using DNS assuming a relatively large computational domain with absorbing boundary conditions. The results show that the absorbing layer method and the extrapolation method with assumed filter perform the best.
Original languageEnglish
Title of host publicationCollection of Technical Papers - 12th AIAA/CEAS Aeroacoustics Conference
Pages205-213
Number of pages9
Volume1
Publication statusPublished - 1 Dec 2006
Event12th AIAA/CEAS Aeroacoustics Conference - Cambridge, MA, United States
Duration: 8 May 200610 May 2006

Conference

Conference12th AIAA/CEAS Aeroacoustics Conference
CountryUnited States
CityCambridge, MA
Period8/05/0610/05/06

ASJC Scopus subject areas

  • Engineering(all)

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