An advanced switching parameter for a hybrid LES/RANS model considering the characteristics of near-wall turbulent length scales

• 安倍, 賢一

  九州大学大学院工学研究院航空宇宙工学部門

抄録

In this study, we proposed an idea for an advanced switching parameter used in a hybrid approach connecting large eddy simulation (LES) with Reynolds-averaged Navier-Stokes (RANS) modeling (the hybrid LES/RANS (HLR) model). Although the HLR model is promising way to predict engineering turbulent flows, an important problem is that RANS is always adopted in the near-wall region, even if the grid resolution is fine enough for LES. To overcome this difficulty, the switching parameter proposed here introduced knowledge of the Kolmogorov microscale that is thought to be reasonable for representing the near-wall turbulence. This parameter enabled the present HLR model to be smoothly replaced by a full LES if a grid resolution was fine enough in the near-wall region. To confirm model performance, the present HLR model was applied to numerical simulations of a periodic hill flow as well as fundamental plane channel flows. The model generally provided reasonable predictions for these test cases that include complex turbulence with massive flow separation.

収録刊行物

• Theoretical and Computational Fluid Dynamics

  Theoretical and Computational Fluid Dynamics 28 (5), 499-519, 2014-08-09

  Springer nature

キーワード

• Turbulence
• Large Eddy Simulation
• Hybrid LES/RANS Model
• Near-wall Turbulent Structures
• Kolmogorov Microscale

詳細情報

• CRID: 1050298532704079488
• NII論文ID: 120006950901
• NII書誌ID: AA11631687
• DOI: 10.1007/s00162-014-0328-3
• ISSN: 14322250
• ISSN: 09354964
• HANDLE: 2324/4150511
• Web Site: http://link.springer.com/content/pdf/10.1007/s00162-014-0328-3.pdf
• Web Site: http://link.springer.com/article/10.1007/s00162-014-0328-3/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1007/s00162-014-0328-3
• 本文言語コード: en
• 資料種別: journal article
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