A method for removal of reflection artifact in computational fluid dynamic simulation of supersonic jet noise

Taeyoung Park; Hyun-Shik Joo; Inman Jang; Seung-Hoon Kang; Won-Suk Ohm; Sang-Joon Shin; Jeongwon Park

doi:10.7776/ASK.2020.39.4.364

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2020 Vol.39, Issue 4 Preview Page Next Page

Research Article

A method for removal of reflection artifact in computational fluid dynamic simulation of supersonic jet noise 초음속 제트소음의 전산유체 모사 시 반사파 아티팩트 제거 기법

31 July 2020. pp. 364-370

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Abstract

Rocket noise generated from the exhaust plume produces the enormous acoustic loading, which adversely affects the integrity of the electronic components and payload (satellite) at liftoff. The prediction of rocket noise consists of two steps: the supersonic jet exhaust is simulated by a method of the Computational Fluid Dynamics (CFD), and an acoustic transport method, such as the Helmholtz-Kirchhoff integral, is applied to predict the noise field. One of the difficulties in the CFD step is to remove the boundary reflection artifacts from the finite computation boundary. In general, artificial damping, known as a sponge layer, is added nearby the boundary to attenuate these reflected waves but this layer demands a large computational area and an optimization procedure of related parameters. In this paper, a cost-efficient way to separate the reflected waves based on the two microphone method is firstly introduced and applied to the computation result of a laboratory-scale supersonic jet noise without sponge layers.

Keywords

Rocket noise

Acoustic loading

Detached eddy simulation

Helmholtz-Kirchhoff integral

Sponge layer

Two microphone method

우주 발사체의 초음속 플룸으로부터 발생하는 고강도 소음은 발사체에 음향하중으로 작용하여 전장품이나 탑재 위성의 오작동 및 고장을 유발한다. 음향하중을 발생시키는 로켓/제트소음의 예측은 초음속 난류 유동(소음원) 예측을 위한 전산유체해석과 음향(소음 전파) 해석이 결합된 모델이 주로 사용된다. 이때, 유동해석 시 계산영역 경계면에서 발생하는 반사파 아티팩트를 제거하기 위해 경계조건 외에 추가적으로 흡수층(sponge layer)과 같은 모델링이 적용된다. 하지만, 해석 대상에 따라 흡수층의 파라미터 최적화 연구가 선행되어야 하고 더 큰 계산 영역을 필요로 하기 때문에, 이는 해석시간 증가의 주요 요인이 된다. 이에 본 논문에서는 계산효율을 증대시키기 위해 흡수층 대신 유동해석 결과에 존재하는 반사파 아티팩트를 두 개의 마이크로폰 기법을 기반으로 하여 제거하는 방법을 처음으로 제안하고, 이를 실제 소형 초음속 제트소음 해석 결과에 적용하였다.

키워드

로켓 소음

음향하중

Detached eddy simulation

헬름홀츠-키르히호프 적분식

흡수층

두 개의 마이크로폰 기법

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 39
No :4
Pages :364-370
Received Date : 2020-04-07
Accepted Date : 2020-07-23
DOI :https://doi.org/10.7776/ASK.2020.39.4.364

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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