Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Computation of Serrated Trailing Edge Flow and Noise Using a Hybrid Zonal RANS-LES

혼합 영역 RANS-LES를 이용한 톱니 뒷전 유동 및 소음장의 계산

  • 김태형 (서울대학교 기계항공공학부) ;
  • 이승훈 (서울대학교 기계항공공학부) ;
  • 이수갑 (서울대학교 기계항공공학부)
  • Received : 2012.03.07
  • Accepted : 2012.04.24
  • Published : 2012.05.20
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Abstract

The evaluation of a zonal RANS-LES approach is documented for the prediction of broadband noise generated by the flow past unmodified and serrated airfoil trailing edges at a high Reynolds number. A multi-domain decomposition is considered, where the acoustic sources are resolved with a LES sub-domain embedded in the RANS domain. A stochastic vortex method is used to generate synthetic turbulent perturbations at the RANS-LES interface. The simulations are performed with a general-purpose unstructured control-volume code FLUENT. The far-field noise is calculated using the aeroacoustic analogy of Ffowcs Williams-Hawkings. The results of the simulation are validated through the full-scaled wind turbine acoustic measurements. It is found that the present approach is adequate for predicting noise radiation of serrated trailing edge flow for low noise rotor system.

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References

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