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Lee, Jae Hwa
Flow Physics and Control Lab
Research Interests
  • Turbulent Flows

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Scale growth of structures in the turbulent boundary layer with a rod-roughened wall

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Title
Scale growth of structures in the turbulent boundary layer with a rod-roughened wall
Author
Lee, Jae HwaLee, JinKim, Jung Hoon
Keywords
DIRECT NUMERICAL-SIMULATION; PIPE-FLOW; ROUGHNESS; ORGANIZATION; MOTIONS; SMOOTH; HYPOTHESIS; SURFACE; REGION
Issue Date
201601
Publisher
AMER INST PHYSICS
Citation
PHYSICS OF FLUIDS, v.28, no.1, pp.015104 -
Abstract
Direct numerical simulation of a turbulent boundary layer over a rod-roughened wall is performed with a long streamwise domain to examine the streamwise-scale growth mechanism of streamwise velocity fluctuating structures in the presence of two-dimensional (2-D) surface roughness. An instantaneous analysis shows that there is a slightly larger population of long structures with a small helix angle (spanwise inclinations relative to streamwise) and a large spanwise width over the rough-wall compared to that over a smooth-wall. Further inspection of time-evolving instantaneous fields clearly exhibits that adjacent long structures combine to form a longer structure through a spanwise merging process over the rough-wall; moreover, spanwise merging for streamwise scale growth is expected to occur frequently over the rough-wall due to the large spanwise scales generated by the 2-D roughness. Finally, we examine the influence of a large width and a small helix angle of the structures over the rough-wall with regard to spatial two-point correlation. The results show that these factors can increase the streamwise coherence of the structures in a statistical sense.
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DOI
http://dx.doi.org/10.1063/1.4939714
ISSN
1070-6631
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MNE_Journal Papers
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