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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2012.7
- 수록면
- 685 - 691 (7page)
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It is essential for the accurate time-domain prediction of broadband noise due to turbulence-cascade interaction to develop inflow/outflow boundary conditions to satisfy the following three requirements: to maintain the back ground mean flow, to nonreflect the outgoing disturbances and to generate the specified input gust. The preceding study showed that perfectly matched layer(PML) boundary condition was successfully applied to absorb the outgoing disturbances and to generate the specified gust in the time-domain computations of broadband noise due to interaction of incident gust with a cascade of flat-plates. In present study, PML boundary condition is extended in order to predict steady mean flow that is needed for the computation of noise due to interaction of incident gust with a cascade of airfoils. PML boundary condition is originally designed to absorb flow disturbances superimposed on the steady meanflow in the buffer zone. However, the steady meanflow must be computed before PML boundary condition is applied on the flow computation. In the present paper, PML equations are extended by introducing source term to maintain desired mean flow conditions. The extended boundary condition is applied to the benchmark problem where the meanflow around a cascade of airfoils is predicted. These illustrative computations reveal that the extended PML equations can effectively provide and maintain the target meanflow.
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참고문헌 (16)
참고문헌 신청
1. [학술지(정기간행물)] - 김상호 / 2009 / 유입난류와 평판 캐스케이드 상호작용에 따른 광대역 소음 해석을 위한 효율적인 시간영역 수치기법의 개발 / 한국소음진동공학회논문집 19 (7) : 719 ~ 725
4. [학술지(정기간행물)] - Cheong, C. / 2006 / High-frequency Approximate Formulation for the Acoustic Power Spectrum due to Cascade-turbulence Interaction / Journal of Acoustical Society of America 19 (1) : 108 ~ 122
5. [학술지(정기간행물)] - Cheong, C. / 2009 / Decomposition of Modal Acoustic Power due to Cascade-turbulence Interaction / Journal of Sound and Vibration 324 : 57 ~ 73
6. [학술지(정기간행물)] - Posson, H. / 2010 / On the use of a Uniformly Valid Analytical Cascade Response Function for Fan Broadband Noise Predictions / Journal of Sound and Vibration 329 : 3721 ~ 3743
7. [학술지(정기간행물)] - Nallasamy, M. / 2007 / Solution of Unsteady Ruler Equations: GustcascadeInteraction Tones / Computers and Fluids 36 : 724 ~ 741
4. [학술지(정기간행물)] - Cheong, C. / 2006 / High-frequency Approximate Formulation for the Acoustic Power Spectrum due to Cascade-turbulence Interaction / Journal of Acoustical Society of America 19 (1) : 108 ~ 122
5. [학술지(정기간행물)] - Cheong, C. / 2009 / Decomposition of Modal Acoustic Power due to Cascade-turbulence Interaction / Journal of Sound and Vibration 324 : 57 ~ 73
6. [학술지(정기간행물)] - Posson, H. / 2010 / On the use of a Uniformly Valid Analytical Cascade Response Function for Fan Broadband Noise Predictions / Journal of Sound and Vibration 329 : 3721 ~ 3743
7. [학술지(정기간행물)] - Nallasamy, M. / 2007 / Solution of Unsteady Ruler Equations: GustcascadeInteraction Tones / Computers and Fluids 36 : 724 ~ 741
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