Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Large Eddy Simulation of Turbulent Flows over Backward-facing Steps

후향 계단에서 난류 유동에 대한 대와동모사

  • 황철홍 (미국립표준기술연구소) ;
  • 금성민 (한라대학교 기계자동차공학부)
  • Published : 2009.03.31
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Abstract

Large eddy simulation code was developed to predict the turbulent flows over backward-facing steps including a recirculating flow phenomena. Localized dynamic ksgs-equation model was employed as a LES subgrid model and the LES solver was implemented on parallel computer consisting of 16 processors to reduce computational costs. The results of laminar flow showed qualitative and quantitative agreements between current simulations and experimental results availablein literatures. The simulation of the turbulent flows also yielded reasonable results. From these results, it can be expected that developed LES code will be very useful to analyze the combustion in stabilities and noise of a practical combustor in the future.

본 연구에서는 재순환 유동 현상을 포함하는 후향 계단에서 난류 유동장에 대한 LES의 예측성능을 검토하였다. LES의 난류모델로서 Localized Dynamic ksgs-equation 모델이 적용되었으며, 계산시간의 절감을 위하여 16개의 프로세서를 이용한 병렬계산이 수행되었다 후향 계단의 층류 유동에 대한 직접수치모사(DNS)의 수행 결과, 본 계산 결과는 기존의 실험 및 수치결과를 매우 잘 예측하였다. 또한 중간 및 높은 Re 수에 해당되는 난류 영역의 LES 결과는 평균 재순환 유동특성을 비교적 잘 예측하였다. 위 결과를 통해 본 연구에서 개발된 LES 프로그램은 향후 실용 연소기에서 연소 불안정성 및 연소 소음 등의 해석에 유용할 것으로 기대된다.

Keywords

References

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