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Lee, Jae Hwa
Flow Physics and Control Lab
Research Interests
  • Turbulent Flow Physics and Control
  • Incompressible and Compressible Flows
  • Fluid-Structure Interaction
  • Multi-Phase Flow with Heat Transfer

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Turbulent boundary layers over rod- and cube-roughened walls

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Title
Turbulent boundary layers over rod- and cube-roughened walls
Author
Lee, Jae HwaSeena, AbuLee, Seung-hyunSung, Hyung Jin
Keywords
Boundary layer structure; Turbulence simulation; Turbulent boundary layers
Issue Date
2012-09
Publisher
TAYLOR & FRANCIS LTD
Citation
JOURNAL OF TURBULENCE, v.13, no.40, pp.1 - 26
Abstract
Direct numerical simulations (DNSs) of spatially developing turbulent boundary layers (TBLs) over two-dimensional (2D) rod-roughened walls and three-dimensional (3D) cube-roughened walls were performed to investigate the effects of the streamwise spacing of roughness elements on the properties of the TBLs. The inspection of the Reynolds stresses showed that except for the 2D rough walls with px/k = 2 and 3, the effects of the roughness on the 2D and 3D rough walls extend to the outer layer and that themagnitude of the Reynolds stresses in the outer layer increases in proportional to px/k. However, such results do not account for the variations with px/k in the form drag and roughness function, which have maximum values at px/k = 8 and 4 for the 2D and 3D rough walls, respectively. Finally, we examined turbulent structure through instantaneous analysis, linear stochastic estimation, and dynamic mode decomposition to the time-evolving flow fields to scrutinize the spatial organization of the outer-layer structures over several different rough walls.
URI
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DOI
10.1080/14685248.2012.716157
ISSN
1468-5248
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