Dynamic hybrid RANS/LES assessment of sound generation and propagation from flow over a circular cylinder

Xiao Wang, Shanti Bhushan, Bukhari Manshoor, Edward Luke, Adrian Sescu, Yuji Hattori, David Thompson, Keith Walters

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Simulations are performed for flow over circular cylinder at M = 0.2, Re = 5000 to assess the predictive capability of turbulence models and numerical schemes available in Loci-CHEM for the farfield acoustics predictions. A complimentary DNS is also performed for validation. Grid and time step study shows that a grid consisting of 7.5M cells and a non-dimensional time step size of 0.165 is sufficient for the hybrid RANS-LES simulations. Results demonstrate that numerical schemes and turbulence models play a critical role in the acoustics generation and propagation. Low-dissipation optimization gradient reconstruction (OGRE) scheme is found to be suitable for the acoustics predictions, but turbulence models show large differences. SST predicts only large-scale fluctuations. Dynamic hybrid RANS-LES (DHRL) performs better than hybrid RANS-LES (HRL) for the prediction of flow separation and turbulent coherent structures, but acoustics predictions are similar to URANS. HRL is found to be under predictive for acoustics predictions. MILES performs the best, suggesting that turbulence models are too dissipative. The future research will focus on implementation and assessment of wall-modeled LES models to improve the predictions.

本文言語English
ホスト出版物のタイトル2018 AIAA/CEAS Aeroacoustics Conference
出版社American Institute of Aeronautics and Astronautics Inc, AIAA
ISBN(印刷版)9781624105609
DOI
出版ステータスPublished - 2018
イベントAIAA/CEAS Aeroacoustics Conference, 2018 - Atlanta, United States
継続期間: 2018 6 252018 6 29

出版物シリーズ

名前2018 AIAA/CEAS Aeroacoustics Conference

Other

OtherAIAA/CEAS Aeroacoustics Conference, 2018
国/地域United States
CityAtlanta
Period18/6/2518/6/29

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 航空宇宙工学

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