Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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PERFORMANCE ASSESSMENT OF THE RANS TURBULENCE MODELS IN PREDICTION OF AERODYNAMIC NOISE FOR AIR-CONDITIONER INDOOR UNIT

에어컨 실내기의 공력소음 예측을 위한 RANS 난류모델의 성능 평가

  • Min, Y.H. (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Kang, S. (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Hur, N. (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Lee, C. (Dept. of Mechanical Engineering, Yonsei Univ.) ;
  • Park, J. (CTO Division, HAE laboratory, LG electronics)
  • Received : 2012.10.23
  • Accepted : 2012.11.27
  • Published : 2012.12.31
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Abstract

The objective of the present study is to investigate the effects of various turbulence models on the aerodynamic noise of an air-conditioner (AC) indoor unit. The results from URANS (unsteady Reynolds-averaged Navier-Stokes) simulations with the standard k-$\varepsilon$, k-$\omega$ shear stress transport (SST) and Spalart-Allmaras (S-A) turbulence models were analyzed and compared with the noise data from the experiments. The frequency spectra of the far-field acoustic pressure were computed using the Farrasat equation derived from the Ffowcs Williams-Hawkings (FW-H) equation based on the acoustic analogy model. Two fixed fan casings and the rotating cross-flow fan were used as the source surfaces of the dipole noise in the Farrasat equation. The result with the standard k-$\epsilon$ model showed a much better agreement with the experimental data compared to the k-w SST and S-A models. The differences in the pressure spectra from the different turbulence models were discussed based on the instantaneous vorticity fields. It was found that the over-estimated power spectra with the k-w SST and S-A models are related to the emphasized small-scale vortices produced with these models.

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References

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