Unsteady flow simulation of leading-edge separation in thinairfoil cascade: A modification to turbulence model

Atsushi Tateishi, Toshinori Watanabe, Takehiro Himeno, Chihiro Inoue

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

Leading edge separation of thin airfoil cascade in subsonic flow at large angle of incidence was simulated by implicit large eddy simulation (ILES) and Reynolds averaged Navier-Stokes (RANS) simulations with various turbulence models. In the ILES simulations with fine grids, the timeaveraged surface pressure qualitatively agreed with the experimental data. The RANS and ILES simulations on the coarse mesh failed to capture a peak of pressure near the leading edge. From spectrum analysis, it was observed that the flow-field was turbulent in the separation bubble. In the failed RANS simulations, the separation bubble was much longer and the turbulence energy near the leading edge was much lower than those in the ILES results. The development of lambdashaped vortex structures and their sudden weakening near the reattachment point was observed in the unsteady simulations. Two possible modifications to existing turbulence models in RANS simulations were proposed based on the comparison of turbulence energy between the ILES and RANS results. It is shown that these modifications improve the bubble length and Cp distributions of RANS simulations, though further validation and modeling are needed for the application to realistic cases.

本文言語英語
ホスト出版物のタイトルTurbomachinery
出版社American Society of Mechanical Engineers (ASME)
ISBN(電子版)9780791856642, 9780791856642
DOI
出版ステータス出版済み - 1 1 2015
外部発表はい
イベントASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015 - Montreal, カナダ
継続期間: 6 15 20156 19 2015

出版物シリーズ

名前Proceedings of the ASME Turbo Expo
2B

その他

その他ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, GT 2015
国/地域カナダ
CityMontreal
Period6/15/156/19/15

All Science Journal Classification (ASJC) codes

  • 工学(全般)

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