Simulation of a Large-Eddy-Break-up Device (LEBU) in a Moderate Reynolds Number Turbulent Boundary Layer
作者: Cheng ChinRamis ÖrlüJason MontyNicholas HutchinsAndrew OoiPhilipp Schlatter
作者单位: 1Department of Mechanical Engineering, University of Melbourne
2Linné FLOW Centre, KTH Mechanics, Royal Institute of Technology
刊名: Flow, Turbulence and Combustion, 2017, Vol.98 (2), pp.445-460
来源数据库: Springer Nature Journal
DOI: 10.1007/s10494-016-9757-y
关键词: Boundary layerLarge eddy simulationWall turbulenceLarge-eddy-break-up deviceDrag reduction
英文摘要: Abstract(#br)A well-resolved large eddy simulation (LES) of a large-eddy break-up (LEBU) device in a spatially evolving turbulent boundary layer is performed with, Reynolds number, based on free-stream velocity and momentum-loss thickness, of R e θ ≈ 4300. The implementation of the LEBU is via an immersed boundary method. The LEBU is positioned at a wall-normal distance of 0.8 δ ( δ denoting the local boundary layer thickness at the location of the LEBU) from the wall. The LEBU acts to delay the growth of the turbulent boundary layer and produces global skin friction reduction beyond 180 δ downstream of the LEBU, with a peak local skin friction reduction of approximately 12 %. However, no net drag reduction is found when accounting for the device drag of the LEBU in accordance with the...
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影响因子:1.274 (2012)

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关键词翻译
  • Reynolds 雷诺